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CVE-2021-22861

Improper access control in GitHub Enterprise Server leading to unauthorized write access to forkable repositories

Published: Mar 3, 2021Updated: Nov 21, 2024 Sources: CVE List NVDCWE-285
NVD MITRE
6.5CVSSMEDIUM
EPSS Score
0.9%
Top 44.5%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
No Fix Available

Description

An improper access control vulnerability was identified in GitHub Enterprise Server that allowed authenticated users of the instance to gain write access to unauthorized repositories via specifically crafted pull requests and REST API requests. An attacker would need to be able to fork the targeted repository, a setting that is disabled by default for organization owned private repositories. 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 2.4.21 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.

CVSS Vector Breakdown

AV:NAC:LPR:LUI:NS:UC:NI:HA:N
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:LPrivileges Required
Low
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:HIntegrity
High
A:NAvailability
None
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Weaknesses

CWE-285NVD-CWE-Other

Affected Products

GitHub Enterprise ServerGitHubDevTools & CI
githubgithubDevTools & CI
githubcommercialUSDevTools & CIaka github

Exploitability

No known exploits, KEV entries, or remediation guidance available for this vulnerability yet.

References

https://docs.github.com/en/enterprise-server%402.20/admin/release-notes#2.20.24
docs.github.com
https://docs.github.com/en/enterprise-server%402.21/admin/release-notes#2.21.15
docs.github.com
https://docs.github.com/en/enterprise-server%402.22/admin/release-notes#2.22.7
docs.github.com
and 1 more references View all →

Timeline

Published
Mar 3, 2021
Last Updated
Nov 21, 2024

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