CVE-2023-27892 : Vulnerability Insights and Analysis

This CVE record was published on May 2, 2023, by MITRE. It involves insufficient length checks in the ShapeShift KeepKey hardware wallet firmware before version 7.7.0, leading to a global buffer overflow via crafted messages. The vulnerability exists in the cf_confirmExecTx() function in ethereum_contracts.c, allowing attackers with physical access to extract the BIP39 mnemonic secret from the hardware wallet.

Understanding CVE-2023-27892

This section delves into the specifics of CVE-2023-27892, highlighting its impact, technical details, and mitigation strategies.

What is CVE-2023-27892?

CVE-2023-27892 is a security vulnerability in the ShapeShift KeepKey hardware wallet firmware that arises from insufficient length checks, enabling a buffer overflow through crafted messages. Attackers can potentially extract sensitive information or crash the device by exploiting this flaw.

The Impact of CVE-2023-27892

The impact of CVE-2023-27892 is significant, with a CVSSv3.1 base score of 3.8 indicating a low severity level. However, the vulnerability poses a high risk to confidentiality, as attackers can access and potentially disclose critical information stored on the hardware wallet.

Technical Details of CVE-2023-27892

In this section, we explore the technical aspects of CVE-2023-27892, including the vulnerability description, affected systems and versions, and the exploitation mechanism.

Vulnerability Description

The vulnerability in the ShapeShift KeepKey hardware wallet firmware allows for a global buffer overflow via crafted messages, specifically in the cf_confirmExecTx() function in ethereum_contracts.c. This flaw can be leveraged by attackers with physical access to compromise the security of the device.

Affected Systems and Versions

The vulnerability impacts ShapeShift KeepKey hardware wallet firmware versions prior to 7.7.0. Users of affected versions are at risk of exploitation unless appropriate mitigation measures are implemented promptly.

Exploitation Mechanism

By sending crafted messages to the vulnerable firmware, attackers can trigger a buffer overflow condition, potentially leading to the extraction of sensitive data such as the BIP39 mnemonic secret stored on the hardware wallet.

Mitigation and Prevention

To protect against CVE-2023-27892 and similar security threats, it is crucial to follow best practices for security hygiene and apply necessary patches and updates.

Immediate Steps to Take

Users of ShapeShift KeepKey hardware wallets should update their firmware to version 7.7.0 or newer to mitigate the vulnerability. Additionally, exercise caution when handling PIN-unlocked devices and avoid exposing them to untrusted entities.

Long-Term Security Practices

Implementing robust security measures such as regular security audits, device monitoring, and access controls can help safeguard against potential attacks on hardware wallet devices.

Patching and Updates

Maintaining up-to-date firmware and staying informed about security advisories from the manufacturer is essential for addressing vulnerabilities promptly. Regularly check for firmware updates and apply patches to enhance the security posture of ShapeShift KeepKey hardware wallets.