CVE-2020-13333 Denial of service in GitLab

Medium 4.3 Published 6 Oct 2020 Updated 4 Aug 2024

An attacker can cause high CPU usage and denial of service in GitLab by submitting specific values to the release asset link update API.

Exploited in the wild: Not known
Login needed: Any signed-in user
Attackable: Over the internet
Victim action needed: Not needed
Fix: Available

What is CVE-2020-13333?

CVE-2020-13333 is a medium-severity denial of service vulnerability in Gitlab Gitlab, published on 6 Oct 2020. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

A potential DOS vulnerability was discovered in GitLab versions 13.1, 13.2 and 13.3. The api to update an asset as a link from a release had a regex check which caused exponential number of backtracks for certain user supplied values resulting in high CPU usage.

Weakness: CWE-400

Which versions are affected by CVE-2020-13333?

1 open source package ship an affected version, including gitlab. It affects 1 product.

Package	Affected	Fixed in
`gitlab` Bitnami	From `13.1.0`	`13.2.10, 13.3.7, 13.4.2`

Products include Gitlab Gitlab.

How do I fix CVE-2020-13333?

Upgrade gitlab to a fixed version for your release line: 13.2.10, 13.3.7 or 13.4.2.

Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.

Is CVE-2020-13333 being exploited?

There is no known exploitation of CVE-2020-13333 in the wild and no public exploit code.

All Gitlab Gitlab vulnerabilities

Sources

Also known as BIT-gitlab-2020-13333, GHSA-8h2p-m6f9-v8r7, UBUNTU-CVE-2020-13333.