CVE-2020-13266 Explained : Impact and Mitigation

A vulnerability in GitLab versions 12.8 through 13.0.1 allows unauthorized users to manipulate permissions of deploy keys.

Understanding CVE-2020-13266

This CVE involves insecure authorization in Project Deploy Keys within GitLab, potentially leading to unauthorized access.

What is CVE-2020-13266?

Insecure authorization in GitLab CE/EE versions 12.8 and later through 13.0.1 enables users to modify permissions of other users' deploy keys under specific circumstances.

The Impact of CVE-2020-13266

The vulnerability poses a medium severity risk with a CVSS base score of 4.3, allowing attackers to tamper with deploy key permissions.

Technical Details of CVE-2020-13266

This section delves into the specifics of the vulnerability.

Vulnerability Description

The flaw in GitLab versions 12.8 to 13.0.1 permits unauthorized users to alter permissions of deploy keys belonging to other users.

Affected Systems and Versions

Product: GitLab
Vendor: GitLab
Vulnerable Versions: >=12.8, <12.9.8, >=12.10, <12.10.7, >=13.0, <13.0.1

Exploitation Mechanism

The vulnerability can be exploited by authenticated users to manipulate deploy key permissions of other users, potentially leading to unauthorized access.

Mitigation and Prevention

Protecting systems from CVE-2020-13266 requires immediate actions and long-term security practices.

Immediate Steps to Take

Update GitLab to versions not affected by the vulnerability.
Monitor deploy key permissions for unauthorized changes.

Long-Term Security Practices

Implement least privilege access controls.
Regularly audit and review permissions within GitLab.

Patching and Updates

Apply security patches provided by GitLab promptly to mitigate the vulnerability.