CVE-2021-22861
CVSS V2 Medium 4
CVSS V3 Medium 6.5
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.
Overview
- CVE ID
- CVE-2021-22861
- Assigner
- product-cna@github.com
- Vulnerability Status
- Analyzed
- Published Version
- 2021-03-03T04:15:13
- Last Modified Date
- 2022-10-25T13:09:27
Weakness Enumerations
CPE Configuration (Product)
| CPE | Vulnerable | Operator | Version Start | Version End |
|---|---|---|---|---|
| cpe:2.3:a:github:github:*:*:*:*:enterprise:*:*:* | 1 | OR | 2.4.21 | 2.20.24 |
| cpe:2.3:a:github:github:*:*:*:*:enterprise:*:*:* | 1 | OR | 2.21.0 | 2.21.15 |
| cpe:2.3:a:github:github:*:*:*:*:enterprise:*:*:* | 1 | OR | 2.22.0 | 2.22.7 |
| cpe:2.3:a:github:github:*:*:*:*:*:*:*:* | 1 | OR | 3.0.0 | 3.0.1 |
CVSS Version 2
- Version
- 2.0
- Vector String
- AV:N/AC:L/Au:S/C:N/I:P/A:N
- Access Vector
- NETWORK
- Access Compatibility
- LOW
- Authentication
- SINGLE
- Confidentiality Impact
- NONE
- Integrity Impact
- PARTIAL
- Availability Impact
- NONE
- Base Score
- 4
- Severity
- MEDIUM
- Exploitability Score
- 8
- Impact Score
- 2.9
CVSS Version 3
- Version
- 3.1
- Vector String
- CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
- Attack Vector
- NETWORK
- Attack Compatibility
- LOW
- Privileges Required
- LOW
- User Interaction
- NONE
- Scope
- UNCHANGED
- Confidentiality Impact
- NONE
- Availability Impact
- NONE
- Base Score
- 6.5
- Base Severity
- MEDIUM
- Exploitability Score
- 2.8
- Impact Score
- 3.6
References
| Reference URL | Reference Tags |
|---|---|
| https://docs.github.com/en/enterprise-server@2.21/admin/release-notes#2.21.15 | Release Notes Vendor Advisory |
| https://docs.github.com/en/enterprise-server@3.0/admin/release-notes#3.0.1 | Release Notes Vendor Advisory |
| https://docs.github.com/en/enterprise-server@2.22/admin/release-notes#2.22.7 | Release Notes Vendor Advisory |
| https://docs.github.com/en/enterprise-server@2.20/admin/release-notes#2.20.24 | Release Notes Vendor Advisory |
Sources
| Source Name | Source URL |
|---|---|
| NIST | https://nvd.nist.gov/vuln/detail/CVE-2021-22861 |
| MITRE | https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-22861 |
History
| Created | Old Value | New Value | Data Type | Notes |
|---|---|---|---|---|
| 2022-05-10 07:20:36 | Added to TrackCVE | |||
| 2022-12-05 23:01:46 | 2021-03-03T04:15Z | 2021-03-03T04:15:13 | CVE Published Date | updated |
| 2022-12-05 23:01:46 | 2022-10-25T13:09:27 | CVE Modified Date | updated | |
| 2022-12-05 23:01:46 | Analyzed | Vulnerability Status | updated |