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CVE-2021-21237 : Vulnerability Insights and Analysis

Learn about CVE-2021-21237 impacting Git LFS on Windows. Discover the vulnerability details, impact severity, affected versions, and mitigation steps.

Git LFS is a command line extension that manages large files with Git. A vulnerability in Git LFS affects Windows systems, allowing the execution of a Git binary from the current directory, enabling potential malicious code execution.

Understanding CVE-2021-21237

This CVE highlights a security flaw in Git LFS that impacts Windows operating systems, potentially leading to arbitrary code execution.

What is CVE-2021-21237?

The vulnerability in Git LFS on Windows allows malicious repositories to execute a git.bat or git.exe file from the current directory, permitting attackers to run arbitrary code. This issue is the result of an incomplete fix for a previously identified vulnerability (CVE-2020-27955).

The Impact of CVE-2021-21237

The impact of this CVE is rated as HIGH, with a CVSS base score of 7.2. It carries a high severity level, affecting confidentiality, integrity, and requiring user interaction for exploitation. The attack complexity is rated as HIGH, with LOW privileges required.

Technical Details of CVE-2021-21237

This section delves into the specific technical aspects of this vulnerability in Git LFS.

Vulnerability Description

The vulnerability in Git LFS on Windows allows for the execution of a Git binary from the current directory, enabling potential attackers to run arbitrary code.

Affected Systems and Versions

Git LFS versions prior to v2.13.2 are affected by this vulnerability, specifically on Windows operating systems.

Exploitation Mechanism

The exploitation involves operating on a malicious repository with a git.bat or git.exe file in the current directory, allowing the execution of arbitrary code.

Mitigation and Prevention

To address CVE-2021-21237 and enhance system security, specific mitigation techniques and long-term preventive measures can be implemented.

Immediate Steps to Take

As an immediate measure, users are advised to update Git LFS to version 2.13.2 or later to mitigate the vulnerability.

Long-Term Security Practices

Implement secure coding practices, avoid untrusted repositories, and regularly update software to strengthen overall system security.

Patching and Updates

Regularly check for security updates and patches for Git LFS to ensure that known vulnerabilities are addressed promptly.

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