CVE-2017-17831 Explained : Impact and Mitigation

GitHub Git LFS before version 2.1.1 had a security vulnerability that allowed remote attackers to execute arbitrary commands. The vulnerability could be exploited using an ssh URL with a dash character at the beginning of the hostname.

Understanding CVE-2017-17831

This CVE entry describes a security vulnerability in GitHub Git LFS that could be abused by malicious actors to run arbitrary commands.

What is CVE-2017-17831?

Prior to version 2.1.1, GitHub Git LFS had a security flaw that enabled attackers to execute arbitrary commands by manipulating the ssh URL within a .lfsconfig file.

The Impact of CVE-2017-17831

The vulnerability in GitHub Git LFS could be exploited by using a specific ssh URL, potentially leading to unauthorized command execution by threat actors.

Technical Details of CVE-2017-17831

GitHub Git LFS vulnerability details and affected systems.

Vulnerability Description

The security flaw in GitHub Git LFS allowed remote attackers to execute arbitrary commands through a manipulated ssh URL in the .lfsconfig file.

Affected Systems and Versions

Product: GitHub Git LFS
Versions affected: Before 2.1.1

Exploitation Mechanism

The vulnerability could be exploited by using an ssh URL with a hostname starting with a dash character, specifically within the "url =" line in a .lfsconfig file.

Mitigation and Prevention

Steps to address and prevent the CVE-2017-17831 vulnerability.

Immediate Steps to Take

Upgrade GitHub Git LFS to version 2.1.1 or newer to mitigate the security risk.
Review and update .lfsconfig files in repositories to ensure they do not contain malicious ssh URLs.

Long-Term Security Practices

Regularly monitor for security advisories and updates from GitHub Git LFS.
Educate users on secure coding practices and the risks associated with manipulating URLs.

Patching and Updates

Apply patches and updates provided by GitHub Git LFS promptly to address security vulnerabilities.