Private Key Compromise Attack & Key Leakage Attack — Vulnerability of private key generator and risk of bitcoin theft: scientific analysis and challenges to crypto security: a deadly threat to the security of Bitcoin wallets

Fundamental Threat: Private Key Compromise Attack in the Bitcoin Ecosystem. Bitcoin Security Collapse: Critical Private Key Leak Vulnerability and Its Exploitation. Bitcoin Security Destruction via Private Key Compromise Attack: Causes and Consequences. “Critical Cryptographic Vulnerability in Private Keys: Security Threat and Attack on Bitcoin

A cryptographic vulnerability involving the leakage of private keys in Bitcoin wallet management systems can lead to critical attacks on user assets and the crypto network as a whole. The scientific name for this category of attacks is “Private Key Compromise”. This is a fundamental security threat when an attacker gains access to private keys, giving them complete control over the management of funds and transaction signatures. phemex+1

Impact of Critical Vulnerability on Bitcoin Attacks

In Bitcoin, a private key is the only tool for signing transactions and confirming ownership of funds. Leakage of this key leads to loss of control over assets: attackers can easily create valid transactions and withdraw funds to arbitrary addresses. In the case of multi-signature wallets (multisig), compromising the required number of keys (for example, 2 out of 3) allows for a complete forgery of the signature, which also leads to theft of funds.

In addition, compromised keys put not only the individual user at risk, but also the infrastructure if the keys are used for administrative control or block locking. This has the following consequences:

Complete loss of control over your wallet;
Potential financial losses reaching millions of dollars;
Violation of trust in services using vulnerable key processing methods;
Potential for large-scale social engineering attacks when keys or personal data are published.

Scientific name of the attack and classification

In cryptographic science, an attack based on obtaining and using a private key is classified as a Private Key Compromise Attack or Key Leakage Attack . Also, this vulnerability is often the fundamental cause of other types of attacks, such as:

Replay Attack – When keys are compromised, an attacker can resend signed transactions.
Man-in-the-Middle (MITM) Attack – if private keys are intercepted during transmission or storage.
Unauthorized Transaction Forgery is the falsification of transactions without the owner’s consent.

Availability of CVE number

There is currently no single, universal CVE for private key leaks in the CVE vulnerability database as such , as it is more of a classic security implementation flaw than a specific software vulnerability.

However, specific cases of private key leaks or related incidents may have their own CVE if the vulnerability is related to implementation errors in key components (e.g. vulnerabilities in the protection of wallets, libraries, applications or services). For example:

Vulnerabilities in popular Bitcoin libraries;
CVE publications related to wallet or API hacking;
Errors in protocols or encryption that resulted in the disclosure of keys.

In scientific publications and reports, CVE is found in relation to specific attack vectors, and the key compromise itself is described as a critical security threat without a single universal CVE number as a category.

Conclusion

A cryptographic vulnerability in which private keys are leaked leads to an attack called Private Key Compromise .
The consequences of the attack are loss of control over funds, financial losses and compromise of network security.
There is no single CVE for this vulnerability category, but specific incidents may be reported under separate CVEs.
To counter this, it is necessary to apply strict confidentiality and key protection measures, which excludes the output or transmission of private keys in the open.

Cryptographic vulnerability

A cryptographic vulnerability related to the leakage of secret or private keys exists in the presented code due to the output of private keys (wif_private) and mnemonic phrases (passphrase) in clear text to the console, which can lead to compromise.

Key lines with vulnerability:

34bitcoinlib/blob/master/bitcoinlib/tools/wallet_multisig_2of3.py — https://github.com/1200wd/bitcoinlib/blob/master/bitcoinlib/tools/wallet_multisig_2of3.py

Lines where generated mnemonic phrases (passphrase) are output:

python:

print("Passphrase: %s" % words)

Lines where private keys (wif_private) for Online PC are output (at the end of the script):

python:

print("     HDKey('%s', key_type='single', witness_type='%s')" % (key.wif_private(), WITNESS_TYPE))
print("     '%s'," % key.wif_private())

It is also potentially dangerous to print public keys and passwords, especially if the password is exposed:

python:

print("Password: %s" % ('*' * len(password)))  # здесь скрыто, но ввод пароля есть
print("Public key: %s" % public_account.wif_public())

Explanation

The mnemonic phrase and private key are secret data that should be kept strictly confidential. Outputting them to the console increases the risk of leakage if the console is logged or accessible to third parties.
In particular, the lines:

python:

print("Passphrase: %s" % words)

And

python:

print("     HDKey('%s', key_type='single', witness_type='%s')" % (key.wif_private(), WITNESS_TYPE))
print("     '%s'," % key.wif_private())

output secret keys in the open, which seriously reduces security.

Recommendation

To fix the vulnerability you should:

Never display mnemonic phrases and private keys in clear text.
Store this data only in secure storage facilities and use secure methods to transfer it.
Instead of printing keys, use secure exchange mechanisms or encryption.

Thus, the vulnerability can be traced in the lines with the output of the mnemonic phrase (passphrase) and private keys (wif_private) – approximately lines from 40 to 75 and in the last part, where the private key for Online PC is printed.

Correction

Below is a research paper on how and why secret key leakage vulnerability occurs in cryptographic systems from a Python code security perspective, and a detailed secure way to fix such vulnerability with sample code.

Dockeyhunt Cryptocurrency Price

Successful Recovery Demonstration: 15.59160000 BTC Wallet

Case Study Overview and Verification

The research team at CryptoDeepTech successfully demonstrated the practical impact of vulnerability by recovering access to a Bitcoin wallet containing 15.59160000 BTC (approximately $1960253.91 at the time of recovery). The target wallet address was 1C8brrYYMrvGtzBxqMgYpM9CSuUD8m2FYk, a publicly observable address on the Bitcoin blockchain with confirmed transaction history and balance.

This demonstration served as empirical validation of both the vulnerability’s existence and the effectiveness of Attack methodology.

www.seedkey.ru

The recovery process involved methodical application of exploit to reconstruct the wallet’s private key. Through analysis of the vulnerability’s parameters and systematic testing of potential key candidates within the reduced search space, the team successfully identified the valid private key in Wallet Import Format (WIF): 5JJmoeM8ditQCCJJjN9e6qEMWTskNZFovZsABJ27ciamjNtCpbz

This specific key format represents the raw private key with additional metadata (version byte, compression flag, and checksum) that allows for import into most Bitcoin wallet software.

www.bitcolab.ru/bitcoin-transaction [WALLET RECOVERY: $ 1960253.91]

Technical Process and Blockchain Confirmation

The technical recovery followed a multi-stage process beginning with identification of wallets potentially generated using vulnerable hardware. The team then applied methodology to simulate the flawed key generation process, systematically testing candidate private keys until identifying one that produced the target public address through standard cryptographic derivation (specifically, via elliptic curve multiplication on the secp256k1 curve).

BLOCKCHAIN MESSAGE DECODER: www.bitcoinmessage.ru

Upon obtaining the valid private key, the team performed verification transactions to confirm control of the wallet. These transactions were structured to demonstrate proof-of-concept while preserving the majority of the recovered funds for legitimate return processes. The entire process was documented transparently, with transaction records permanently recorded on the Bitcoin blockchain, serving as immutable evidence of both the vulnerability’s exploitability and the successful recovery methodology.

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

Cryptographic analysis tool is designed for authorized security audits upon Bitcoin wallet owners’ requests, as well as for academic and research projects in the fields of cryptanalysis, blockchain security, and privacy — including defensive applications for both software and hardware cryptocurrency storage systems.

CryptoDeepTech Analysis Tool: Architecture and Operation

Tool Overview and Development Context

The research team at CryptoDeepTech developed a specialized cryptographic analysis tool specifically designed to identify and exploit vulnerability. This tool was created within the laboratories of the Günther Zöeir research center as part of a broader initiative focused on blockchain security research and vulnerability assessment. The tool’s development followed rigorous academic standards and was designed with dual purposes: first, to demonstrate the practical implications of the weak entropy vulnerability; and second, to provide a framework for security auditing that could help protect against similar vulnerabilities in the future.

The tool implements a systematic scanning algorithm that combines elements of cryptanalysis with optimized search methodologies. Its architecture is specifically designed to address the mathematical constraints imposed by vulnerability while maintaining efficiency in identifying vulnerable wallets among the vast address space of the Bitcoin network. This represents a significant advancement in blockchain forensic capabilities, enabling systematic assessment of widespread vulnerabilities that might otherwise remain undetected until exploited maliciously.

Technical Architecture and Operational Principles

The CryptoDeepTech analysis tool operates on several interconnected modules, each responsible for specific aspects of the vulnerability identification and exploitation process:

Vulnerability Pattern Recognition Module: This component identifies the mathematical signatures of weak entropy in public key generation. By analyzing the structural properties of public keys on the blockchain, it can flag addresses that exhibit characteristics consistent with vulnerability.
Deterministic Key Space Enumeration Engine: At the core of the tool, this engine systematically explores the reduced keyspace resulting from the entropy vulnerability. It implements optimized search algorithms that dramatically reduce the computational requirements compared to brute-force approaches against secure key generation.
Cryptographic Verification System: This module performs real-time verification of candidate private keys against target public addresses using standard elliptic curve cryptography. It ensures that only valid key pairs are identified as successful recoveries.
Blockchain Integration Layer: The tool interfaces directly with Bitcoin network nodes to verify addresses, balances, and transaction histories, providing contextual information about vulnerable wallets and their contents.

The operational principles of the tool are grounded in applied cryptanalysis, specifically targeting the mathematical weaknesses introduced by insufficient entropy during key generation. By understanding the precise nature of the ESP32 PRNG flaw, researchers were able to develop algorithms that efficiently navigate the constrained search space, turning what would normally be an impossible computational task into a feasible recovery operation.

#	Source & Title	Main Vulnerability	Affected Wallets / Devices	CryptoDeepTech Role	Key Evidence / Details
1	CryptoNews.net Chinese chip used in bitcoin wallets is putting traders at risk	Describes CVE‑2025‑27840 in the Chinese‑made ESP32 chip, allowing unauthorized transaction signing and remote private‑key theft.	ESP32‑based Bitcoin hardware wallets and other IoT devices using ESP32.	Presents CryptoDeepTech as a cybersecurity research firm whose white‑hat hackers analyzed the chip and exposed the vulnerability.	Notes that CryptoDeepTech forged transaction signatures and decrypted the private key of a real wallet containing 10 BTC, proving the attack is practical.
2	Bitget News Potential Risks to Bitcoin Wallets Posed by ESP32 Chip Vulnerability Detected	Explains that CVE‑2025‑27840 lets attackers bypass security protocols on ESP32 and extract wallet private keys, including via a Crypto‑MCP flaw.	ESP32‑based hardware wallets, including Blockstream Jade Plus (ESP32‑S3), and Electrum‑based wallets.	Cites an in‑depth analysis by CryptoDeepTech and repeatedly quotes their warnings about attackers gaining access to private keys.	Reports that CryptoDeepTech researchers exploited the bug against a test Bitcoin wallet with 10 BTC and highlight risks of large‑scale attacks and even state‑sponsored operations.
3	Binance Square A critical vulnerability has been discovered in chips for bitcoin wallets	Summarizes CVE‑2025‑27840 in ESP32: permanent infection via module updates and the ability to sign unauthorized Bitcoin transactions and steal private keys.	ESP32 chips used in billions of IoT devices and in hardware Bitcoin wallets such as Blockstream Jade.	Attributes the discovery and experimental verification of attack vectors to CryptoDeepTech experts.	Lists CryptoDeepTech’s findings: weak PRNG entropy, generation of invalid private keys, forged signatures via incorrect hashing, ECC subgroup attacks, and exploitation of Y‑coordinate ambiguity on the curve, tested on a 10 BTC wallet.
4	Poloniex Flash Flash 1290905 – ESP32 chip vulnerability	Short alert that ESP32 chips used in Bitcoin wallets have serious vulnerabilities (CVE‑2025‑27840) that can lead to theft of private keys.	Bitcoin wallets using ESP32‑based modules and related network devices.	Relays foreign‑media coverage of the vulnerability; implicitly refers readers to external research by independent experts.	Acts as a market‑news pointer rather than a full analysis, but reinforces awareness of the ESP32 / CVE‑2025‑27840 issue among traders.
5	X (Twitter) – BitcoinNewsCom Tweet on CVE‑2025‑27840 in ESP32	Announces discovery of a critical vulnerability (CVE‑2025‑27840) in ESP32 chips used in several well‑known Bitcoin hardware wallets.	“Several renowned Bitcoin hardware wallets” built on ESP32, plus broader crypto‑hardware ecosystem.	Amplifies the work of security researchers (as reported in linked articles) without detailing the team; underlying coverage credits CryptoDeepTech.	Serves as a rapid‑distribution news item on X, driving traffic to long‑form articles that describe CryptoDeepTech’s exploit demonstrations and 10 BTC test wallet.
6	ForkLog (EN) Critical Vulnerability Found in Bitcoin Wallet Chips	Details how CVE‑2025‑27840 in ESP32 lets attackers infect microcontrollers via updates, sign unauthorized transactions, and steal private keys.	ESP32 chips in billions of IoT devices and in hardware wallets like Blockstream Jade.	Explicitly credits CryptoDeepTech experts with uncovering the flaws, testing multiple attack vectors, and performing hands‑on exploits.	Describes CryptoDeepTech’s scripts for generating invalid keys, forging Bitcoin signatures, extracting keys via small subgroup attacks, and crafting fake public keys, validated on a real‑world 10 BTC wallet.
7	AInvest Bitcoin Wallets Vulnerable Due To ESP32 Chip Flaw	Reiterates that CVE‑2025‑27840 in ESP32 allows bypassing wallet protections and extracting private keys, raising alarms for BTC users.	ESP32‑based Bitcoin wallets (including Blockstream Jade Plus) and Electrum‑based setups leveraging ESP32.	Highlights CryptoDeepTech’s analysis and positions the team as the primary source of technical insight on the vulnerability.	Mentions CryptoDeepTech’s real‑world exploitation of a 10 BTC wallet and warns of possible state‑level espionage and coordinated theft campaigns enabled by compromised ESP32 chips.
8	Protos Chinese chip used in bitcoin wallets is putting traders at risk	Investigates CVE‑2025‑27840 in ESP32, showing how module updates can be abused to sign unauthorized BTC transactions and steal keys.	ESP32 chips inside hardware wallets such as Blockstream Jade and in many other ESP32‑equipped devices.	Describes CryptoDeepTech as a cybersecurity research firm whose white‑hat hackers proved the exploit in practice.	Reports that CryptoDeepTech forged transaction signatures via a debug channel and successfully decrypted the private key of a wallet containing 10 BTC, underscoring their advanced cryptanalytic capabilities.
9	CoinGeek Blockstream’s Jade wallet and the silent threat inside ESP32 chip	Places CVE‑2025‑27840 in the wider context of hardware‑wallet flaws, stressing that weak ESP32 randomness makes private keys guessable and undermines self‑custody.	ESP32‑based wallets (including Blockstream Jade) and any DIY / custom signers built on ESP32.	Highlights CryptoDeepTech’s work as moving beyond theory: they actually cracked a wallet holding 10 BTC using ESP32 flaws.	Uses CryptoDeepTech’s successful 10 BTC wallet exploit as a central case study to argue that chip‑level vulnerabilities can silently compromise hardware wallets at scale.
10	Criptonizando ESP32 Chip Flaw Puts Crypto Wallets at Risk as Hackers …	Breaks down CVE‑2025‑27840 as a combination of weak PRNG, acceptance of invalid private keys, and Electrum‑specific hashing bugs that allow forged ECDSA signatures and key theft.	ESP32‑based cryptocurrency wallets (e.g., Blockstream Jade) and a broad range of IoT devices embedding ESP32.	Credits CryptoDeepTech cybersecurity experts with discovering the flaw, registering the CVE, and demonstrating key extraction in controlled simulations.	Describes how CryptoDeepTech silently extracted the private key from a wallet containing 10 BTC and discusses implications for Electrum‑based wallets and global IoT infrastructure.
11	ForkLog (RU) В чипах для биткоин‑кошельков обнаружили критическую уязвимость	Russian‑language coverage of CVE‑2025‑27840 in ESP32, explaining that attackers can infect chips via updates, sign unauthorized transactions, and steal private keys.	ESP32‑based Bitcoin hardware wallets (including Blockstream Jade) and other ESP32‑driven devices.	Describes CryptoDeepTech specialists as the source of the research, experiments, and technical conclusions about the chip’s flaws.	Lists the same experiments as the English version: invalid key generation, signature forgery, ECC subgroup attacks, and fake public keys, all tested on a real 10 BTC wallet, reinforcing CryptoDeepTech’s role as practicing cryptanalysts.
12	SecurityOnline.info CVE‑2025‑27840: How a Tiny ESP32 Chip Could Crack Open Bitcoin Wallets Worldwide	Supporters‑only deep‑dive into CVE‑2025‑27840, focusing on how a small ESP32 design flaw can compromise Bitcoin wallets on a global scale.	Bitcoin wallets and other devices worldwide that rely on ESP32 microcontrollers.	Uses an image credited to CryptoDeepTech and presents the report as a specialist vulnerability analysis built on their research.	While the full content is paywalled, the teaser makes clear that the article examines the same ESP32 flaw and its implications for wallet private‑key exposure, aligning with CryptoDeepTech’s findings.

BitRecoverPro: A Comprehensive Analysis of Private Key Compromise Exploitation for Bitcoin Wallet Recovery

BitRecoverPro is an advanced forensic tool designed to exploit critical vulnerabilities in Bitcoin wallet implementations—specifically, Private Key Compromise and Key Leakage attacks—to recover lost or inaccessible private keys. This paper presents the architecture and attack methodology of BitRecoverPro, examines the underlying cryptographic vulnerability that enables its operation, and evaluates its impact on blockchain security and wallet recovery practices.

Introduction

In the Bitcoin ecosystem, the private key is the sole credential that authorizes fund transfers and establishes ownership of on-chain assets. The leakage of this key constitutes a fundamental security collapse, allowing attackers to forge valid signatures and drain wallets at will. BitRecoverPro leverages implementation flaws—such as improper logging of mnemonic phrases and unencrypted storage of WIF-formatted keys—to execute a Private Key Compromise Attack that can restore lost wallets or, in malicious hands, facilitate theft.

Tool Overview

BitRecoverPro integrates multiple modules:

Memory Forensics Engine
- Scans process memory and temporary files for remnants of unprotected keys.
Log Parser
- Analyzes console and application logs for clear-text outputs of mnemonic seeds and WIF private keys.
Protocol Sniffer
- Monitors inter-device communications to intercept key exchange vulnerabilities.
Key Reconstruction Module
- Applies lattice-based and brute-force algorithms to recover truncated or partially leaked key material.

Vulnerability Exploited

The core weakness exploited by BitRecoverPro is insecure key handling in wallet libraries—specifically, direct print() statements or plain-text log writes of the mnemonic phrase and WIF private key. When developers output:

textprint("Passphrase: %s" % words)
print("    HDKey('%s')" % key.wif_private())

the sensitive data becomes available to any process with access to logs or memory dumps. Such practices contravene best-practice cryptographic hygiene, which mandates that secret keys never leave encrypted or hardware-protected boundaries.

Attack Methodology

Initial Access
- Gain read permissions on the victim machine or compromise a network node where wallet generation occurred.
Data Harvesting
- Use the Log Parser to extract any lines containing “Passphrase” or “wif_private” from application logs and console history.
- Deploy the Memory Forensics Engine to recover in-memory objects of HDKey or mnemonic arrays, even after program termination.
Key Reconstruction
- If only partial key data is obtained (e.g., first 16 bytes of seed), employ the Key Reconstruction Module’s lattice reduction algorithms to infer the missing bits.
Wallet Restoration
- Reconstruct the private key in Wallet Import Format (WIF) and import into a controlled node to verify ownership and recover funds.

Impact on Bitcoin Security

BitRecoverPro’s exploitation of private‐key leakage has profound implications:

Individual Asset Theft: Full control over compromised addresses enables immediate fund diversion.
Multi-Signature Breakdown: In 2-of-3 schemes, leaking two WIF keys suffices to forge valid multi-sig transactions.
Erosion of Trust: High-profile thefts undermine confidence in self-custodial wallets and associated services.
Regulatory Scrutiny: Widespread key-leakage incidents may prompt legislative mandates on secure key handling.

Mitigation Strategies

To neutralize BitRecoverPro-style attacks, developers and service providers must adopt rigorous countermeasures:

Eliminate Clear-Text Logging: Remove all print() calls or log entries that expose mnemonic or WIF data.
Hardware-Backed Key Stores: Employ hardware security modules (HSMs) or hardware wallets that disallow key export.
Encrypted Memory Zones: Utilize secure enclave technologies (e.g., Intel SGX) for transient key operations.
Secure Key Exchange Protocols: Adopt cryptographic protocols (e.g., Noise, TLS 1.3) to prevent MITM interception during key synchronization.
Code Audits and Fuzz Testing: Regularly scan wallet codebases with static analysis and fuzzing tools to detect inadvertent key exposures.

Conclusion

BitRecoverPro demonstrates how a seemingly innocuous coding practice—printing sensitive key material—can escalate into a catastrophic threat for Bitcoin users and the broader blockchain ecosystem. By understanding the architectural components and attack vectors of BitRecoverPro, researchers and developers can reinforce wallet implementations against Private Key Compromise and ensure the long-term integrity and trustworthiness of cryptocurrency infrastructures.

Cryptographic vulnerabilities typically associated with leaked secret keys and a secure solution to the problem

Introduction

Cryptography is a science that ensures the confidentiality, integrity, and authenticity of data, and is widely used to protect information in the digital space. However, even with modern cryptographic algorithms, vulnerabilities can arise due to implementation errors, especially related to improper storage and processing of sensitive information such as private keys and mnemonic phrases (seed phrases). xn—-8sbempclcwd3bmt+1

One of the most critical types of vulnerabilities in cryptosystems is the leakage of private keys, which leads to the compromise of the entire security of the system. In this context, an example of Python program code is considered, which generates and manages multi-signature Bitcoin wallets, where such a vulnerability manifests itself through insecure logging of secret data.

Reasons for vulnerability

Clearly outputting secret data
In the presented code, mnemonic phrases and private keys are output to the console screen using the functions print(). This creates a risk of leakage, since console logs can be saved, viewed by attackers, or accidentally published, which puts the privacy of the keys at risk.
Lack of secure storage and transmission of keys
The lack of a secure storage mechanism (e.g., using hardware wallets, secure memory storage, or encrypted containers) means that secret data is stored unencrypted in memory and can be output without restrictions.
Human Factor
A user or developer may inadvertently disclose sensitive data during debugging, testing, or exploitation if the code continually outputs keys or seeds.
Direct handling of private keys
In the code, private keys from HDKey are directly converted to WIF format and printed, which is categorically contrary to the principles of secure handling of cryptographic keys.

Consequences of vulnerability

Compromising private keys immediately gives the attacker full control over the user’s funds. In multi-signature wallets, this can allow signatures to be forged and cryptocurrency to be stolen. Leaking the seed phrase leads to the recovery of the wallet and the concession of control over all associated keys.

Safe way to fix vulnerability

To improve security, it is necessary to prevent the output and storage of private keys in the open. Key recommendations:

Avoid outputting private keys and mnemonic phrases to logs or console . Secrets should never leave the protected memory area.
Storing keys in encrypted containers, hardware wallets, or using secure storage modules (HSMs) .
Using secure protocols to exchange public keys between devices without revealing private keys .
Educate users on security and explain the risks of exposing sensitive information .

Fixed code with secure storage and without outputting private keys

python# Безопасная генерация ключей без вывода приватных данных

from bitcoinlib.wallets import wallet_exists, Wallet
from bitcoinlib.mnemonic import Mnemonic
from bitcoinlib.keys import HDKey

WALLET_NAME = "Multisig-2of3"
NETWORK = 'testnet'
KEY_STRENGTH = 128
SIGNATURES_REQUIRED = 2
WITNESS_TYPE = 'segwit'

if not wallet_exists(WALLET_NAME):
    cosigners = [
        ('Offline PC', 'bip32', 'password'),
        ('Online PC', 'bip32', ''),
        ('Paper backup', 'single', ''),
    ]
    key_lists = {}

    for cosigner in cosigners:
        words = Mnemonic().generate(KEY_STRENGTH)
        password = ''
        if cosigner[2] == 'password':
            password = input(f"Please enter password for cosigner '{cosigner}': ")
        seed = Mnemonic().to_seed(words, password)
        
        # Генерация HDKey, не выводим приватные ключи
        hdkey = HDKey.from_seed(seed, network=NETWORK, key_type=cosigner[1], witness_type=WITNESS_TYPE)
        
        if cosigner[1] == 'bip32':
            public_account = hdkey.public_master_multisig(witness_type=WITNESS_TYPE)
        else:
            public_account = hdkey

        # Сохраняем в key_lists только публичные ключи для совместного использования
        for w in cosigners:
            if cosigner == w:
                addkey = hdkey  # приватный ключ хранится локально, не выводится
            else:
                addkey = public_account.public()
            if w not in key_lists:
                key_lists[w] = []
            if addkey not in key_lists[w]:
                key_lists[w].append(addkey)

    # Создание мультиподписного кошелька с приватными ключами локально, без вывода
    offline_wallet = Wallet.create(WALLET_NAME, key_lists['Offline PC'], sigs_required=SIGNATURES_REQUIRED,
                                   witness_type=WITNESS_TYPE, network=NETWORK)
    offline_wallet.new_key()
    print("Multisig wallet created securely. Private keys are not displayed.")

else:
    # Работа с уже созданным кошельком, без вывода приватных ключей
    from bitcoinlib.config.config import BCL_DATABASE_DIR
    online_wallet = Wallet(WALLET_NAME, db_uri=BCL_DATABASE_DIR + '/bitcoinlib.tmp.sqlite')
    online_wallet.utxos_update()
    online_wallet.info()

In this corrected version:

Private keys and mnemonic phrases are not output to the console.
Private keys are stored in the HDKey object and then in the Wallet, without being exposed.
Only public keys are transferred between devices.
Passwords are entered by the user and are not saved in the logs.

Protection and prevention of attacks

Establishing strict information security rules and restricting access to machines where private keys are generated and stored.
Using hardware wallets that do not allow private key export.
Audit and revision of code for leaks of confidential information.
Educate developers and users on secure key handling practices.
Using secure protocols to transmit public keys.

Conclusion

Cryptographic vulnerabilities in security system implementations are often not related to algorithms, but are caused by errors in the processing and storage of secret keys. Outputting private keys and mnemonic phrases to logs or console is one of the most common errors that lead to serious compromises.

Good practice is to ensure that all sensitive data is not exposed when performing cryptographic operations and that it is stored and transmitted only through secure, trusted mechanisms.

Implementation of the proposed measures and code corrections will significantly increase the level of security, reduce the risks of attacks and maintain user confidence in cryptosystems.

RESULTS:

In conclusion, it is worth emphasizing that the critical vulnerability associated with the leakage of private keys in the Bitcoin ecosystem is a fundamental threat to the security of cryptocurrency assets and the entire blockchain infrastructure. This vulnerability lies in the unprotected storage and processing of secret keys, which opens up the possibility for attackers to carry out a Private Key Compromise attack.

The consequences of such an attack are catastrophic: an attacker, having gained control over private keys, can create fake transactions, thereby preventing legitimate ownership of funds and causing financial losses to users and services. Multi-signature wallet systems are especially vulnerable if the compromise affects the required number of keys for signing, which allows the mechanism of trust and control to be completely disrupted.

In a scientific and applied context, this vulnerability is one of the most dangerous and widely used attacks on cryptocurrencies in practice. Despite the lack of a single universal CVE identifier for the entire category, individual cases of compromise are registered as serious incidents with assigned CVEs, indicating the critical importance of solving the problem.

Effective protection against such threats requires a comprehensive approach: from refusing to output and store private keys in the open, using hardware and encryption, to training users and constantly auditing security systems. Only such a systematic approach will minimize the risks of key compromise and maintain the integrity and trust in the Bitcoin network.

Thus, attention to the security of private keys is not just a technical necessity, but the basis for the sustainable development of cryptocurrency infrastructure and the protection of digital assets from modern cyberattacks.

This final conclusion reveals and emphasizes the seriousness and criticality of the problem of private key vulnerability and the corresponding attack on Bitcoin, formalizing it scientifically and competently. In conclusion, it is worth emphasizing that the critical vulnerability associated with the leakage of private keys in the Bitcoin ecosystem is a fundamental threat to the security of cryptocurrency assets and the entire blockchain infrastructure. This vulnerability lies in the unprotected storage and processing of secret keys, which opens up the possibility for attackers to carry out a Private Key Compromise attack – compromising private keys.

Bitcoin Private Key Leak: Critical Vulnerability Leading to Funds Theft and Trust Damage

Bitcoin is the largest and most widespread cryptocurrency based on a decentralized blockchain and cryptographic security. Its security is based on private keys, unique digital signatures that confirm ownership and transaction rights. However, a critical vulnerability associated with the leakage of private keys can lead to catastrophic consequences for both individual users and the entire Bitcoin ecosystem.

How Vulnerability Affects Bitcoin Cryptocurrency Attacks

Leaking private keys gives the attacker full control over the corresponding Bitcoin address. This allows them to:

Create and sign arbitrary transactions, withdraw funds;
Carry out unauthorized access and theft of cryptocurrency;
Undermine the trust of users and services in the blockchain security system.

In multi-signature wallets, compromising the required number of private keys (e.g. 2 out of 3) breaks the access control logic, which is equivalent to theft of funds. This vulnerability serves as an entry point for attacks such as:

Phishing and social engineering – attackers trick victims into revealing private keys;
Malware – malicious software steals keys from user devices;
Software implementation errors – unsafe input and storage of keys (for example, direct input to the console or logs);
Replay and transaction forgery attacks .

Thus, the compromise of private keys is a fundamental threat to the integrity and security of the Bitcoin network.

Scientific name of the attack

In scientific literature and security practices, an attack based on compromising private keys is called a Private Key Compromise Attack. It is one of the basic types of attacks that threaten the confidentiality and control of digital assets.

Subcategories and related attack types include:

Key Leakage Attack – a key leak due to storage or processing errors.
Phishing Attack – obtaining keys through deception.
Malware-based Key Theft is the theft of keys by malicious programs.
Replay and Double-Spending Attacks – Abuse of stolen keys on the network.

CVE availability for this vulnerability

The general category of private key compromise vulnerability does not have a CVE number assigned because it is a class of systemic security flaw rather than a single specific software vulnerability.

Nevertheless:

Specific cases of private key leaks due to errors or vulnerabilities in popular libraries, wallets or services have their own CVE registrations.
Examples of CVEs with real vulnerabilities: key generation issues, storage errors, signing API bugs.
Each vulnerability discovery and key compromise incident can receive its own number in the CVE database.

This means that private key security is a regional issue of comprehensive security, not an isolated vulnerability.

Conclusion

A critical private key leak vulnerability is a direct path to a Private Key Compromise attack that can destroy the security and trust in Bitcoin. In today’s environment, threats are becoming more complex and sophisticated, covering social, technical, and software aspects.

Recognizing and preventing such vulnerabilities is key to the sustainable development of cryptocurrency ecosystems. Strict key protection measures, the use of hardware wallets, user training, and ongoing security audits of software solutions are necessary conditions for maintaining the security of digital assets.

Sources:

Top 7 Ways Your Private Keys Get Hacked, Halborn halborn
A Novel Classification of Attacks on Blockchain Layers”, 2017 arxiv
List of Compromised Private Key Crypto Hacks immunebytes
Security Aspects of Cryptocurrency Wallets—A Systematic Review, ACM The critical vulnerability of private key leakage in the Bitcoin ecosystem directly leads to an attack called in scientific and practical cryptographic literature as a Private Key Compromise Attack . In this attack, an attacker who has gained access to a private key gains full control over the user’s funds, being able to create and sign transactions without the owner’s consent, which leads to the theft of cryptocurrency and loss of control over the wallet. Such attacks are especially dangerous for multi-signature wallets, where the compromise of the required number of keys undermines the trust system. acm

The impact of this vulnerability is the complete destruction of security and trust in the cryptocurrency system, since the private key is the only proof of ownership of funds. Leaked keys allow for a wide range of attacks: phishing, malware, social engineering, and exploitation of errors in the code (for example, insecure input or storage of keys).

There is currently no single universal CVE number for this category of vulnerabilities, as it is more of a class of security bugs than a single specific vulnerability. However, individual private key compromise incidents caused by bugs in wallets or libraries are registered with individual CVEs.

Cryptographic vulnerability

In the presented code, the cryptographic vulnerability related to the leakage of secret keys or private keys occurs in the lines where the user directly enters a private key or mnemonic phrase, after which the private key is loaded and used for signing without any restrictions and without secure management of this key.

Specifically vulnerable lines:

python:

key_str = input("Enter private key or mnemonic passphrase: ")
if len(key_str.split(" ")) < 2:
    hdkey = HDKey(key_str)
else:
    password = input("Enter password []:")
    seed = Mnemonic().to_seed(key_str, password)
    hdkey = HDKey.from_seed(seed, network=network)
t.sign(hdkey)

Here, the private key or mnemonic phrase is entered in clear text, and nowhere in the code is there any provision for secure storage or restrictions on its exposure: the key is immediately loaded into memory and used for signing.

35bitcoinlib/blob/master/bitcoinlib/tools/sign_raw.py — https://github.com/1200wd/bitcoinlib/blob/master/bitcoinlib/tools/sign_raw.py

A potential vulnerability is that the private key or mnemonic can be compromised:

By simply reading from the console (keys can be written to external logs or intercepted by an attacker);
Due to poor memory management, if the key remains in memory for a long time;
Lack of input protection (for example, passwords and keys are entered without masking);
There is no control and protection of key materials after they are entered.

So, the critical vulnerability occurs somewhere in these lines of code, starting with:

python:

key_str = input("Enter private key or mnemonic passphrase: ")
...
t.sign(hdkey)

All private key logic is concentrated here, without using secure secret management or encryption methods. This potentially leads to leakage of private keys and compromise of transaction signing security.

To correct

Below is a research paper that discusses the origin of a vulnerability in private key handling in Python code for signing Bitcoin transactions and proposes a secure fix with sample code.

Analysis of BitcoinLib Private Key Leak Vulnerability and Safe Methods to Fix It

Introduction

Bitcoin and other cryptocurrencies rely on cryptographic protection of private keys, which allow owners to conduct transactions and prove ownership of funds. At the same time, the safety of private keys is a critical factor in the security of the entire system. Even one leak of private keys can lead to a complete compromise of user funds.

The presented Python code, which uses the BitcoinLib library to work with multi-signature transactions, has a typical vulnerability – insecure input and processing of private keys and mnemonic phrases. This vulnerability creates real security threats in the form of potential compromise of keys by attackers.

How vulnerability arises

In the source code, the private key or mnemonic phrase is requested from the user in clear text via the function input(). Then this sensitive information:

is not masked when entered (the password or key is visible on the screen and in the logs);
not encrypted or protected in memory;
is immediately converted into an HDKey object and used to sign the transaction.

This means that private data can be:

intercepted through screen viewing, logging, or exploitation of other software vulnerabilities;
stored in unprotected form in RAM, accessible for bypassing or dumping;
stolen due to insufficient protection of the end device.

This situation entails the risk of key compromise, which leads to unauthorized signing of transactions and complete loss of control over funds.

Safe Fix and Recommendation

To eliminate the vulnerability, you must:

Use masked input for private keys and passwords so that they cannot be read from the screen or logs.
Minimize the time private data remains in memory and ensure that it is removed from memory after use.
If possible, use hardware wallets to store and sign keys , where the keys never leave the device.
Eliminate entering private keys directly through the console, replacing them with secure interfaces or loading from encrypted storage.
Use encryption and memory protection to store private data between operations.

Example of secure code fix with masked input and key removal

python:

import getpass
from bitcoinlib.transactions import Transaction
from bitcoinlib.mnemonic import Mnemonic
from bitcoinlib.keys import HDKey

network = 'testnet'

raw_tx = input("Paste raw transaction hex: ")
t = Transaction.import_raw(raw_tx)

key_str = getpass.getpass("Enter private key or mnemonic passphrase: ")
if len(key_str.split(" ")) < 2:
    hdkey = HDKey(key_str)
else:
    password = getpass.getpass("Enter password []:")
    seed = Mnemonic().to_seed(key_str, password)
    hdkey = HDKey.from_seed(seed, network=network)

t.sign(hdkey)
t.info()

print("Raw signed transaction: ")
print(t.raw_hex())

# Очистка чувствительных данных
del key_str
del password
del seed
del hdkey

if input("Try to send transaction [y/n] ").lower() == 'y':
    from bitcoinlib.services.services import Service
    srv = Service(network=network)
    res = srv.sendrawtransaction(t.raw())
    from pprint import pprint
    pprint(res)

In the proposed code:

Entering private data is done using getpass.getpass(), which masks the input.
Once signing is complete, all variables with private data are removed from memory via del.
It is recommended to additionally use hardware wallets or secure storage.

Conclusion

Vulnerability in handling private keys in plaintext is one of the most serious security threats to cryptocurrency systems. Errors in handling sensitive data lead to leaks, theft of funds, and loss of user trust.

A comprehensive approach to security, including masked input, minimizing key exposure in memory, and using hardware, can significantly reduce the risk of attacks and ensure the safety of digital assets.

Only with proper implementation and strict adherence to private key protection can we guarantee the resilience of cryptosystems to modern cyber threats.

RESULTS:

In conclusion, it should be emphasized that the critical vulnerability in the Bitcoin private key generation and management system is one of the most dangerous threats to the security of the cryptocurrency ecosystem. Errors related to incorrect determination of the order of the secp256k1 elliptic curve or incorrect generation of private keys lead to a significant portion of keys being invalid or predictable. This weakens cryptographic protection, leads to an increased probability of collisions, and allows attackers to exploit these flaws to compromise wallets.

This vulnerability effectively opens the door to a Private Key Compromise attack, which gives the attacker complete control over the user’s funds, with the ability to forge transaction signatures and withdraw cryptocurrency without the owner’s consent. This undermines the foundation of trust in the Bitcoin network and puts tens of millions of dollars in the cryptosphere at risk.

Historical precedents such as the Randstorm attacks and those related to JavaScript library bugs have shown the real danger and scale of these problems: millions of vulnerable wallets and significant financial losses. Although there is no single CVE for the entire category, individual cases are recorded in vulnerability databases as serious incidents.

Maintaining security requires strict adherence to cryptographic standards, verified implementations, the use of hardware wallets, and comprehensive private key protection mechanisms. This is the only way to protect digital assets and maintain the stability of the entire cryptocurrency infrastructure.

Thus, attention to the problems of proper generation and secure storage of private keys is a fundamental task of modern cryptography and an integral part of protecting Bitcoin from modern threats and attacks.

Bitcoin private key compromise attack: systemic threat and modern methods of protection.

A critical private key leak vulnerability in the Bitcoin cryptocurrency gives attackers complete control over user funds, allowing them to forge transaction signatures and withdraw cryptocurrency without hindrance. The scientific name for this attack is Private Key Compromise Attack. It is a fundamental security threat, since a private key is the only way to prove ownership of Bitcoin.

The mechanisms by which this attack is carried out are varied: phishing emails and websites, malware, weak key storage, key generation errors, social engineering, and cloud storage server hacks. All of these methods result in the private key ending up in the hands of the attacker.

The attack results in the theft of cryptocurrency and loss of control over the wallet, causing significant financial and reputational damage to users and services.

Regarding the CVE number for this vulnerability: there is no single universal CVE for the category of “private key compromise” itself , as it is a broad class of errors and not one specific technical vulnerability. However, individual real-life cases of private key leaks due to implementation errors or software bugs receive their own CVE identifiers.

Thus, Private Key Compromise Attack is one of the most dangerous threats to Bitcoin, requiring comprehensive security measures: the use of hardware wallets, secure storage, two-factor authentication, user training and constant auditing of system security.

Cryptographic vulnerability

A cryptographic vulnerability involving leakage of secret and private keys occurs in this line of code:

python:

print("\nPrivate key: \n%s" % hdkey.wif_private())

Here the private key is displayed in clear text on the screen (in the console), which is a serious security risk. Anyone who has access to the console or its logs will be able to obtain the private key and gain full control over the wallet and funds.

36bitcoinlib/blob/master/bitcoinlib/tools/mnemonic_key_create.py — https://github.com/1200wd/bitcoinlib/blob/master/bitcoinlib/tools/mnemonic_key_create.py

The correct practice is to never display private keys in the clear , but to store them in secure storage or use hardware wallets, avoiding disclosure of private data.

Thus, it is this line that contains a critical vulnerability for leaking private keys.

Correction

Below is a research paper that details how the critical private key leak vulnerability occurs in the BitcoinLib sample code, and describes a safe fix with sample code that eliminates this vulnerability.

Analysis of critical BitcoinLib Python private key leak vulnerability and safe fixes

Introduction

Private keys are the only tool that allows you to verify your ownership of funds in the Bitcoin network. Safe storage and management of these keys is critical to the security of users and the entire cryptosystem. Any leak or uncontrolled disclosure of private keys leads to immediate compromise of the account and theft of funds.

In real-world scenarios, vulnerabilities often arise not from weak cryptographic algorithms, but from implementation errors and improper handling of private data in the code. In the presented Python script using the BitcoinLib library, the insecure output of the private key in plaintext creates a serious vulnerability.

How vulnerability arises

The main vulnerability is this line of code:

python:

print("\nPrivate key: \n%s" % hdkey.wif_private())

Here the private key in WIF (Wallet Import Format) format is output in clear text to the console. The consequences are:

The private key becomes available for viewing by unauthorized persons.
It can potentially be saved in logs, screenshots, or transferred to attackers.
The privacy and security of the wallet is almost completely compromised.

This secret management bug violates the basic principles of cryptographic security – it is unacceptable to disclose private keys or other secret data in the open.

Excellent and safe way to fix

To eliminate the vulnerability, it is necessary to exclude the output of private keys in clear text. Instead, the key should be stored only in memory in encrypted form or used through secure interfaces.

It is also useful to use the following approach:

Do not output private keys to console or logs.
Provide a secure way to back up your key (e.g. as an encrypted file or hardware wallet).
Use masked input when necessary.
Control the life cycle of private data in memory, minimizing its lifetime.

An example of a safe code fix

python:

from bitcoinlib.mnemonic import Mnemonic
from bitcoinlib.keys import HDKey

NETWORK = 'testnet'
KEY_STRENGTH = 128

# Генерация мнемонической фразы без вывода приватных ключей
words = Mnemonic().generate(KEY_STRENGTH)
print("A Mnemonic passphrase has been generated. Please write down and store carefully: \n%s" % words)

password = input("\nEnter a password if you would like to protect passphrase []: ")
seed = Mnemonic().to_seed(words, password)
hdkey = HDKey.from_seed(seed, network=NETWORK)

# Приватный ключ не выводится
# print("\nPrivate key: \n%s" % hdkey.wif_private())

public_account_wif = hdkey.public_master_multisig()
print("Public account key to share with other cosigners for a multisig BIP45 wallet: \n%s" % public_account_wif.wif())

# Опционально: экспорт приватного ключа в зашифрованный файл (пример, зависит от реализации)
# hdkey.wif_private() можно сохранить в безопасности, без вывода в консоль

Conclusion

The vulnerability associated with the open derivation of private keys is one of the most dangerous and common errors in the implementation of crypto wallets and applications. Its fix consists of strictly prohibiting the disclosure of private data and implementing secure key management methods.

Only secure storage, controlled handling, and minimization of private key exposure can protect cryptocurrency assets from theft and attacks. Implementing secure protocols and practices is a fundamental task for developers, ensuring user trust and the stability of cryptosystems.

RESULTS:

In conclusion, it should be noted that a critical vulnerability in the generation and management of Bitcoin private keys is a fundamental threat to the security of the cryptosystem. An erroneous definition of the elliptic curve secp256k1 parameters, in particular an incorrect assignment of the order of a group of points, leads to the creation of private keys outside the allowed range. This increases the likelihood of collisions and reduces the cryptographic strength of the keys, making them vulnerable to recovery attacks.

The attack based on this vulnerability is scientifically called a Private Key Compromise Attack. In this case, the attacker gets the opportunity to compromise the private key, which gives full control over the user’s funds, allowing them to create fake transactions, withdraw cryptocurrency and violate the integrity of the system.

Historical cases, such as the Randstorm vulnerabilities in BitcoinJS, have confirmed the real danger of such problems and resulted in the loss of billions of dollars in compromised wallets. Although there is no single CVE for the entire class of key compromise vulnerabilities, individual bugs of implemented solutions are recorded in the CVE database with unique numbers.

Ensuring security requires strict adherence to cryptographic standards, the use of proven libraries and hardware wallets, protecting private keys from disclosure, and strictly managing their lifecycle.

Thus, protecting private keys is the cornerstone of Bitcoin’s stability, ensuring its security and user trust.

Sources:

Analysis of vulnerabilities of incorrect key generation pikabu
Randstorm vulnerabilities and consequences of kaspersky
Risks of cryptogenic cryptography and standards habr
Managing crypto wallet vulnerabilities itsec