Medium severity · published Mar 3, 2021
CVE-2021-22861
An improper access control vulnerability was identified in GitHub Enterprise Server that allowed authenticated users of the instance to gain write access to unauthorized…
6.5
CVSS
1%
EPSS
No
On KEV
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
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
None
Integrity
High
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)1.0% · higher than 61% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
GI
Github · Github
2.4.21 before 2.20.24; 2.21.0 before 2.21.15; 2.22.0 before 2.22.7; 3.0.0 before 3.0.1 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-22861
CVE.org
https://www.cve.org/CVERecord?id=CVE-2021-22861
docs.github.com
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
https://docs.github.com/en/enterprise-server%403.0/admin/release-notes#3.0.1
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