CVE-2021-39900 : What You Need to Know

This CVE-2021-39900 article provides details about an information disclosure vulnerability in GitLab versions 10.8 to 14.3.1.

Understanding CVE-2021-39900

This section elaborates on the nature of the vulnerability.

What is CVE-2021-39900?

The CVE-2021-39900 vulnerability in GitLab version 10.8 and above allowed exposure of the full URL of artifacts stored in object storage through Rails logs.

The Impact of CVE-2021-39900

The impact of this vulnerability is discussed in this section.

Technical Details of CVE-2021-39900

This section provides technical insights into the CVE-2021-39900 vulnerability.

Vulnerability Description

The vulnerability allowed unauthorized retrieval of artifact URLs from GitLab object storage via Rails logs.

Affected Systems and Versions

GitLab versions affected by CVE-2021-39900 include:

Versions >=10.8, <14.1.7
Versions >=14.2, <14.2.5
Versions >=14.3, <14.3.1

Exploitation Mechanism

The exploitation required network access and high privileges, but had low confidentiality and integrity impacts.

Mitigation and Prevention

This section outlines steps to mitigate and prevent exploitation of CVE-2021-39900.

Immediate Steps to Take

Update GitLab to a non-vulnerable version.
Monitor and restrict access to Rails logs.
Educate users on the importance of secure URLs.

Long-Term Security Practices

Conduct regular security audits.
Employ access controls to limit URL exposure.
Implement encryption for sensitive URLs.

Patching and Updates

GitLab has released patches for this vulnerability in versions 14.1.7, 14.2.5, and 14.3.1.