CVE-2021-39880 : What You Need to Know

A Denial Of Service vulnerability in the apollo_upload_server Ruby gem in GitLab allows an attacker to deny access to all users via specially crafted requests.

Understanding CVE-2021-39880

This CVE affects GitLab versions 11.9 to 14.2.2.

What is CVE-2021-39880?

The vulnerability in the apollo_upload_server Ruby gem in GitLab allows attackers to cause Denial of Service by sending crafted requests.

The Impact of CVE-2021-39880

The base severity is Medium with a CVSS score of 6.5. The attack vector is through a network with high availability impact.

Technical Details of CVE-2021-39880

This section provides detailed technical information about the vulnerability.

Vulnerability Description

The flaw allows attackers to deny access to all users in affected GitLab versions via crafted requests.

Affected Systems and Versions

GitLab versions >=14.2 and <14.2.2
GitLab versions >=14.1 and <14.1.4
GitLab versions >=11.9 and <14.0.9

Exploitation Mechanism

Attackers exploit the vulnerability by sending specially crafted requests to the apollo_upload_server middleware.

Mitigation and Prevention

Learn how to protect your system from CVE-2021-39880.

Immediate Steps to Take

Update GitLab to version 14.2.2 if using an affected version.
Apply security patches provided by GitLab.
Monitor and restrict network access to vulnerable components.

Long-Term Security Practices

Regularly update and patch software to prevent vulnerabilities.
Conduct security assessments and audits periodically.

Patching and Updates

GitLab has released patches for affected versions.
Keep systems up to date with the latest security fixes.