gsd-2021-22861
Vulnerability from gsd
Modified
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


To clipboard 

{
  "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": {
                      "version_data": [
                        {
                          "version_affected": "\u003c",
                          "version_name": "2.20",
                          "version_value": "2.20.24"
                        },
                        {
                          "version_affected": "\u003c",
                          "version_name": "2.21",
                          "version_value": "2.21.15"
                        },
                        {
                          "version_affected": "\u003c",
                          "version_name": "2.22",
                          "version_value": "2.22.7"
                        },
                        {
                          "version_affected": "\u003c",
                          "version_name": "3.0",
                          "version_value": "3.0.1"
                        }
                      ]
                    }
                  }
                ]
              },
              "vendor_name": "GitHub"
            }
          ]
        }
      },
      "credit": [
        {
          "lang": "eng",
          "value": "Teddy Katz"
        }
      ],
      "data_format": "MITRE",
      "data_type": "CVE",
      "data_version": "4.0",
      "description": {
        "description_data": [
          {
            "lang": "eng",
            "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"
              }
            ]
          }
        ]
      },
      "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",
            "refsource": "MISC",
            "url": "https://docs.github.com/en/enterprise-server@2.21/admin/release-notes#2.21.15"
          },
          {
            "name": "https://docs.github.com/en/enterprise-server@2.22/admin/release-notes#2.22.7",
            "refsource": "MISC",
            "url": "https://docs.github.com/en/enterprise-server@2.22/admin/release-notes#2.22.7"
          },
          {
            "name": "https://docs.github.com/en/enterprise-server@3.0/admin/release-notes#3.0.1",
            "refsource": "MISC",
            "url": "https://docs.github.com/en/enterprise-server@3.0/admin/release-notes#3.0.1"
          }
        ]
      },
      "source": {
        "discovery": "EXTERNAL"
      }
    },
    "nvd.nist.gov": {
      "configurations": {
        "CVE_data_version": "4.0",
        "nodes": [
          {
            "children": [],
            "cpe_match": [
              {
                "cpe23Uri": "cpe:2.3:a:github:github:*:*:*:*:enterprise:*:*:*",
                "cpe_name": [],
                "versionEndExcluding": "2.22.7",
                "versionStartIncluding": "2.22.0",
                "vulnerable": true
              },
              {
                "cpe23Uri": "cpe:2.3:a:github:github:*:*:*:*:enterprise:*:*:*",
                "cpe_name": [],
                "versionEndExcluding": "2.21.15",
                "versionStartIncluding": "2.21.0",
                "vulnerable": true
              },
              {
                "cpe23Uri": "cpe:2.3:a:github:github:*:*:*:*:*:*:*:*",
                "cpe_name": [],
                "versionEndExcluding": "3.0.1",
                "versionStartIncluding": "3.0.0",
                "vulnerable": true
              },
              {
                "cpe23Uri": "cpe:2.3:a:github:github:*:*:*:*:enterprise:*:*:*",
                "cpe_name": [],
                "versionEndExcluding": "2.20.24",
                "versionStartIncluding": "2.4.21",
                "vulnerable": true
              }
            ],
            "operator": "OR"
          }
        ]
      },
      "cve": {
        "CVE_data_meta": {
          "ASSIGNER": "product-cna@github.com",
          "ID": "CVE-2021-22861"
        },
        "data_format": "MITRE",
        "data_type": "CVE",
        "data_version": "4.0",
        "description": {
          "description_data": [
            {
              "lang": "en",
              "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": "en",
                  "value": "NVD-CWE-Other"
                }
              ]
            }
          ]
        },
        "references": {
          "reference_data": [
            {
              "name": "https://docs.github.com/en/enterprise-server@2.21/admin/release-notes#2.21.15",
              "refsource": "MISC",
              "tags": [
                "Release Notes",
                "Vendor Advisory"
              ],
              "url": "https://docs.github.com/en/enterprise-server@2.21/admin/release-notes#2.21.15"
            },
            {
              "name": "https://docs.github.com/en/enterprise-server@3.0/admin/release-notes#3.0.1",
              "refsource": "MISC",
              "tags": [
                "Release Notes",
                "Vendor Advisory"
              ],
              "url": "https://docs.github.com/en/enterprise-server@3.0/admin/release-notes#3.0.1"
            },
            {
              "name": "https://docs.github.com/en/enterprise-server@2.22/admin/release-notes#2.22.7",
              "refsource": "MISC",
              "tags": [
                "Release Notes",
                "Vendor Advisory"
              ],
              "url": "https://docs.github.com/en/enterprise-server@2.22/admin/release-notes#2.22.7"
            },
            {
              "name": "https://docs.github.com/en/enterprise-server@2.20/admin/release-notes#2.20.24",
              "refsource": "MISC",
              "tags": [
                "Release Notes",
                "Vendor Advisory"
              ],
              "url": "https://docs.github.com/en/enterprise-server@2.20/admin/release-notes#2.20.24"
            }
          ]
        }
      },
      "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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