CVE-2021-39893 : Security Advisory and Response

This CVE-2021-39893 article provides details about a potential DOS vulnerability discovered in GitLab affecting versions >=9.1 and <14.3.1.

Understanding CVE-2021-39893

This section delves into the vulnerability's nature, impact, affected systems, and mitigation steps.

What is CVE-2021-39893?

A potential denial-of-service (DOS) vulnerability in GitLab from version 9.1 onwards that allowed unauthorized file parsing.

The Impact of CVE-2021-39893

The vulnerability has a CVSS v3.1 base score of 5.3 (Medium severity) with low attack complexity and vector through network.

Technical Details of CVE-2021-39893

Explore the technical specifics of the CVE to understand affected systems and mitigation measures.

Vulnerability Description

Vulnerability Type: Uncontrolled Resource Consumption in GitLab.
Discovery Credit: Internally by GitLab team.

Affected Systems and Versions

Product: GitLab
Versions Affected: >=9.1, <14.1.7; >=14.2, <14.2.5; >=14.3, <14.3.1.

Exploitation Mechanism

The vulnerability allowed parsing files without authorization, potentially leading to DOS attacks.

Mitigation and Prevention

Discover the steps to protect systems and prevent exploitation of CVE-2021-39893.

Immediate Steps to Take

Upgrade GitLab to version 14.3.1 to mitigate the vulnerability.
Monitor network traffic for any unusual activity.

Long-Term Security Practices

Regularly review and validate access permissions in GitLab.
Conduct security assessments to identify and address vulnerabilities.

Patching and Updates

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