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CVE-2020-13307 : Vulnerability Insights and Analysis

Discover the impact of CVE-2020-13307, a vulnerability in GitLab versions before 13.1.10, 13.2.8, and 13.3.4 allowing unauthorized access. Learn how to mitigate and prevent this security risk.

A vulnerability in GitLab versions before 13.1.10, 13.2.8, and 13.3.4 allowed malicious users to maintain access by not revoking current user sessions when 2-factor authentication was activated.

Understanding CVE-2020-13307

This CVE involves a session fixation vulnerability in GitLab.

What is CVE-2020-13307?

The vulnerability in GitLab versions prior to 13.1.10, 13.2.8, and 13.3.4 allowed unauthorized users to retain access due to a flaw in session management.

The Impact of CVE-2020-13307

        CVSS Base Score: 3.8 (Low)
        Attack Vector: Network
        Privileges Required: High
        Confidentiality, Integrity, and Availability Impact: Low
        Scope: Unchanged
        The vulnerability could be exploited by attackers to maintain unauthorized access to GitLab instances.

Technical Details of CVE-2020-13307

This section provides more in-depth technical insights into the vulnerability.

Vulnerability Description

        The issue stemmed from GitLab's failure to revoke user sessions when 2-factor authentication was enabled, enabling malicious users to persist access.

Affected Systems and Versions

        Affected Product: GitLab
        Affected Versions:

              =1.0, <13.1.10

              =13.2, <13.2.8

              =13.3, <13.3.4

Exploitation Mechanism

        Attackers could exploit this vulnerability by activating 2-factor authentication and then maintaining access even after logout.

Mitigation and Prevention

Protect your systems from CVE-2020-13307 with these mitigation strategies.

Immediate Steps to Take

        Upgrade GitLab to versions 13.1.10, 13.2.8, or 13.3.4 or newer to patch the vulnerability.
        Monitor user sessions and activity for any suspicious behavior.

Long-Term Security Practices

        Implement multi-factor authentication to enhance security.
        Regularly review and update session management policies.

Patching and Updates

        Stay informed about security updates from GitLab and promptly apply patches to secure your systems.

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