CVE-2021-22863 Missing authorization in GitHub Enterprise Server
Authenticated users can improperly modify maintainer permissions on pull requests, potentially gaining unauthorized access to head branches in GitHub Enterprise Server.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2021-22863?
CVE-2021-22863 is a high-severity missing authorization vulnerability in GitHub Enterprise Server, published on 3 Mar 2021. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
An improper access control vulnerability was identified in the GitHub Enterprise Server GraphQL API that allowed authenticated users of the instance to modify the maintainer collaboration permission of a pull request without proper authorization. By exploiting this vulnerability, an attacker would be able to gain access to head branches of pull requests opened on repositories of which they are a maintainer. Forking is disabled by default for organization owned private repositories and would prevent this vulnerability. Additionally, branch protections such as required pull request reviews or status checks would prevent unauthorized commits from being merged without further review or validation. This vulnerability affected all versions of GitHub Enterprise Server since 2.12.22 and was fixed in versions 2.20.24, 2.21.15, 2.22.7 and 3.0.1. This vulnerability was reported via the GitHub Bug Bounty program.
Weakness: CWE-285
Which versions are affected by CVE-2021-22863?
It affects 1 product.
Products include Github Github.
How do I fix CVE-2021-22863?
No fix has been published for CVE-2021-22863 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-2021-22863 being exploited?
There is no known exploitation of CVE-2021-22863 in the wild and no public exploit code.
Other vulnerabilities in GitHub Enterprise Server
- CVE-2020-10516 Improper access control in GitHub Enterprise Server leading to privilege escalation of organization member
- CVE-2017-18365 Deserialization in n/a
- CVE-2020-10519 Unsafe configuration options in GitHub Pages leading to remote code execution on GitHub Enterprise Server
- CVE-2020-10518 Unsafe configuration options in GitHub Pages leading to remote code execution on GitHub Enterprise Server
- CVE-2012-2055 Missing authorization in n/a
Sources
Also known as GHSA-8p87-5p57-jm4v.