CVE-2021-22869 Improper access control in GitHub Enterprise Server allows self-hosted runners to execute outside their control group

Critical 9.8 Published 24 Sep 2021 Updated 3 Aug 2024

Attackers can execute code on unauthorized self-hosted runners due to improper access control checks in GitHub Enterprise Server.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2021-22869?

CVE-2021-22869 is a critical missing authorization vulnerability in Github Enterprise Server, published on 24 Sep 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

An improper access control vulnerability in GitHub Enterprise Server allowed a workflow job to execute in a self-hosted runner group it should not have had access to. This affects customers using self-hosted runner groups for access control. A repository with access to one enterprise runner group could access all of the enterprise runner groups within the organization because of improper authentication checks during the request. This could cause code to be run unintentionally by the incorrect runner group. This vulnerability affected GitHub Enterprise Server versions from 3.0.0 to 3.0.15 and 3.1.0 to 3.1.7 and was fixed in 3.0.16 and 3.1.8 releases.

Weakness: CWE-287, CWE-668

Which versions are affected by CVE-2021-22869?

It affects 1 product.

Products include Github Enterprise Server.

How do I fix CVE-2021-22869?

No fix has been published for CVE-2021-22869 yet. Limit exposure of the affected software until one is available.

Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.

Is CVE-2021-22869 being exploited?

There is no known exploitation of CVE-2021-22869 in the wild and no public exploit code.

All Github Enterprise Server vulnerabilities

Sources

Also known as GHSA-7vxg-f9rp-jrr5.