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CVE-2019-3902 : Vulnerability Insights and Analysis

Discover the impact of CVE-2019-3902 affecting Mercurial versions prior to 4.9. Learn about the exploit, mitigation steps, and prevention measures to secure your systems.

A vulnerability has been discovered in versions of Mercurial prior to 4.9. An exploit involving the usage of symbolic links and subrepositories allowed malicious actors to bypass Mercurial's path-checking mechanism, permitting them to create files in locations outside of a repository's scope.

Understanding CVE-2019-3902

This CVE affects the Mercurial version before 4.9 and poses a medium severity risk with a CVSS base score of 5.1.

What is CVE-2019-3902?

        The vulnerability in Mercurial before version 4.9 allows attackers to write files outside the repository's boundaries using symbolic links and subrepositories.

The Impact of CVE-2019-3902

        Attack Complexity: High
        Attack Vector: Local
        Integrity Impact: High
        Base Score: 5.1 (Medium Severity)

Technical Details of CVE-2019-3902

This section provides detailed technical information about the CVE.

Vulnerability Description

        The flaw in Mercurial before 4.9 enables the circumvention of path-checking logic, leading to unauthorized file writing outside the repository.

Affected Systems and Versions

        Product: Mercurial
        Vendor: The Mercurial Project
        Versions Affected: Before 4.9

Exploitation Mechanism

        Malicious actors exploit symbolic links and subrepositories to create files beyond the repository's intended scope.

Mitigation and Prevention

Protect your systems from CVE-2019-3902 with the following steps:

Immediate Steps to Take

        Update Mercurial to version 4.9 or newer to mitigate the vulnerability.
        Regularly monitor and restrict the usage of symbolic links and subrepositories within Mercurial.

Long-Term Security Practices

        Implement strict file system permissions to prevent unauthorized file writes.
        Conduct regular security audits to identify and address potential vulnerabilities.

Patching and Updates

        Stay informed about security updates and patches released by Mercurial to address known vulnerabilities.

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