GSD-2021-22861

Vulnerability from gsd - Updated: 2023-12-13 01:23
Details
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.
Aliases
Aliases
CVE-2021-22861
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{
  "GSD": {
    "alias": "CVE-2021-22861",
    "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.",
    "id": "GSD-2021-22861"
  },
  "gsd": {
    "metadata": {
      "exploitCode": "unknown",
      "remediation": "unknown",
      "reportConfidence": "confirmed",
      "type": "vulnerability"
    },
    "osvSchema": {
      "aliases": [
        "CVE-2021-22861"
      ],
      "details": "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.",
      "id": "GSD-2021-22861",
      "modified": "2023-12-13T01:23:24.381504Z",
      "schema_version": "1.4.0"
    }
  },
  "namespaces": {
    "cve.org": {
      "CVE_data_meta": {
        "ASSIGNER": "product-cna@github.com",
        "ID": "CVE-2021-22861",
        "STATE": "PUBLIC",
        "TITLE": "Improper access control in GitHub Enterprise Server leading to unauthorized write access to forkable repositories"
      },
      "affects": {
        "vendor": {
          "vendor_data": [
            {
              "product": {
                "product_data": [
                  {
                    "product_name": "GitHub Enterprise Server",
                    "version": {
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                        {
                          "version_affected": "\u003c",
                          "version_name": "2.20",
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              "vendor_name": "GitHub"
            }
          ]
        }
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      "credit": [
        {
          "lang": "eng",
          "value": "Teddy Katz"
        }
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      "description": {
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            "value": "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."
          }
        ]
      },
      "problemtype": {
        "problemtype_data": [
          {
            "description": [
              {
                "lang": "eng",
                "value": "CWE-285 Improper Authorization"
              }
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      },
      "references": {
        "reference_data": [
          {
            "name": "https://docs.github.com/en/enterprise-server@2.20/admin/release-notes#2.20.24",
            "refsource": "MISC",
            "url": "https://docs.github.com/en/enterprise-server@2.20/admin/release-notes#2.20.24"
          },
          {
            "name": "https://docs.github.com/en/enterprise-server@2.21/admin/release-notes#2.21.15",
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          },
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            "refsource": "MISC",
            "url": "https://docs.github.com/en/enterprise-server@3.0/admin/release-notes#3.0.1"
          }
        ]
      },
      "source": {
        "discovery": "EXTERNAL"
      }
    },
    "nvd.nist.gov": {
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        "nodes": [
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                "cpe23Uri": "cpe:2.3:a:github:github:*:*:*:*:enterprise:*:*:*",
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              }
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            "operator": "OR"
          }
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          "ID": "CVE-2021-22861"
        },
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        "description": {
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            }
          ]
        },
        "problemtype": {
          "problemtype_data": [
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              "description": [
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                  "value": "NVD-CWE-Other"
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        },
        "references": {
          "reference_data": [
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              "name": "https://docs.github.com/en/enterprise-server@2.21/admin/release-notes#2.21.15",
              "refsource": "MISC",
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                "Vendor Advisory"
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            },
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              "name": "https://docs.github.com/en/enterprise-server@3.0/admin/release-notes#3.0.1",
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              "url": "https://docs.github.com/en/enterprise-server@3.0/admin/release-notes#3.0.1"
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              "name": "https://docs.github.com/en/enterprise-server@2.22/admin/release-notes#2.22.7",
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            }
          ]
        }
      },
      "impact": {
        "baseMetricV2": {
          "acInsufInfo": false,
          "cvssV2": {
            "accessComplexity": "LOW",
            "accessVector": "NETWORK",
            "authentication": "SINGLE",
            "availabilityImpact": "NONE",
            "baseScore": 4.0,
            "confidentialityImpact": "NONE",
            "integrityImpact": "PARTIAL",
            "vectorString": "AV:N/AC:L/Au:S/C:N/I:P/A:N",
            "version": "2.0"
          },
          "exploitabilityScore": 8.0,
          "impactScore": 2.9,
          "obtainAllPrivilege": false,
          "obtainOtherPrivilege": false,
          "obtainUserPrivilege": false,
          "severity": "MEDIUM",
          "userInteractionRequired": false
        },
        "baseMetricV3": {
          "cvssV3": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 6.5,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "HIGH",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N",
            "version": "3.1"
          },
          "exploitabilityScore": 2.8,
          "impactScore": 3.6
        }
      },
      "lastModifiedDate": "2022-10-25T13:09Z",
      "publishedDate": "2021-03-03T04:15Z"
    }
  }
}


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Sightings

Author Source Type Date

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Detection rules are retrieved from Rulezet.