CVE-2021-22861 Improper access control in GitHub Enterprise Server leading to unauthorized write access to forkable repositories

2021-03-0303:25:21

CWE-285

GitHub_P

www.cve.org

0.002 Low

EPSS

Percentile

51.6%

JSON

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.

CNA Affected

[
  {
    "product": "GitHub Enterprise Server",
    "vendor": "GitHub",
    "versions": [
      {
        "lessThan": "2.20.24",
        "status": "affected",
        "version": "2.20",
        "versionType": "custom"
      },
      {
        "lessThan": "2.21.15",
        "status": "affected",
        "version": "2.21",
        "versionType": "custom"
      },
      {
        "lessThan": "2.22.7",
        "status": "affected",
        "version": "2.22",
        "versionType": "custom"
      },
      {
        "lessThan": "3.0.1",
        "status": "affected",
        "version": "3.0",
        "versionType": "custom"
      }
    ]
  }
]