CVE-2021-22865

An improper access control vulnerability was identified in GitHub Enterprise Server that allowed access tokens generated from a GitHub App's web authentication flow to read private repository metadata via the REST API without having been granted the appropriate permissions. To exploit this vulnerability, an attacker would need to create a GitHub App on the instance and have a user authorize the application through the web authentication flow. The private repository metadata returned would be limited to repositories owned by the user the token identifies. This vulnerability affected all versions of GitHub Enterprise Server prior to 3.0.4 and was fixed in versions 3.0.4, 2.22.10, 2.21.18. This vulnerability was reported via the GitHub Bug Bounty program.

CVSS v3.0 6.5 MEDIUM
CVSS v2.0 4.3 MEDIUM

6.5^/10

CVSS v3.0 : MEDIUM

Vector :

Exploitability : 2.8 / Impact : 3.6

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction REQUIRED

Confidentiality Impact HIGH

Integrity Impact NONE

Availability Impact NONE

Scope UNCHANGED

4.3^/10

CVSS v2.0 : MEDIUM

Vector : AV:N/AC:M/Au:N/C:P/I:N/A:N

Exploitability : 8.6 / Impact : 2.9

Access Vector NETWORK

Access Complexity MEDIUM

Authentication NONE

Confidentiality Impact PARTIAL

Integrity Impact NONE

Availability Impact NONE

References

Link	Resource
https://docs.github.com/en/enterprise-server@2.21/admin/release-notes#2.21.18	Release Notes Vendor Advisory
https://docs.github.com/en/enterprise-server@2.22/admin/release-notes#2.22.10	Release Notes Vendor Advisory
https://docs.github.com/en/enterprise-server@3.0/admin/release-notes#3.0.4	Release Notes Vendor Advisory

Advertisement

Configurations

Configuration 1 (hide)

OR	cpe:2.3:a:github:enterprise_server::::::::
	cpe:2.3:a:github:enterprise_server::::::::
	cpe:2.3:a:github:enterprise_server::::::::

Information

Published : 2021-04-02 11:15

Updated : 2022-10-25 07:04

NVD link : CVE-2021-22865

Mitre link : CVE-2021-22865

JSON object : View

CWE

NVD-CWE-Other

Advertisement

Products Affected

github

enterprise_server

{"cve": {"data_type": "CVE", "references": {"reference_data": [{"url": "https://docs.github.com/en/enterprise-server@2.21/admin/release-notes#2.21.18", "name": "https://docs.github.com/en/enterprise-server@2.21/admin/release-notes#2.21.18", "tags": ["Release Notes", "Vendor Advisory"], "refsource": "MISC"}, {"url": "https://docs.github.com/en/enterprise-server@2.22/admin/release-notes#2.22.10", "name": "https://docs.github.com/en/enterprise-server@2.22/admin/release-notes#2.22.10", "tags": ["Release Notes", "Vendor Advisory"], "refsource": "MISC"}, {"url": "https://docs.github.com/en/enterprise-server@3.0/admin/release-notes#3.0.4", "name": "https://docs.github.com/en/enterprise-server@3.0/admin/release-notes#3.0.4", "tags": ["Release Notes", "Vendor Advisory"], "refsource": "MISC"}]}, "data_format": "MITRE", "description": {"description_data": [{"lang": "en", "value": "An improper access control vulnerability was identified in GitHub Enterprise Server that allowed access tokens generated from a GitHub App's web authentication flow to read private repository metadata via the REST API without having been granted the appropriate permissions. To exploit this vulnerability, an attacker would need to create a GitHub App on the instance and have a user authorize the application through the web authentication flow. The private repository metadata returned would be limited to repositories owned by the user the token identifies. This vulnerability affected all versions of GitHub Enterprise Server prior to 3.0.4 and was fixed in versions 3.0.4, 2.22.10, 2.21.18. This vulnerability was reported via the GitHub Bug Bounty program."}]}, "problemtype": {"problemtype_data": [{"description": [{"lang": "en", "value": "NVD-CWE-Other"}]}]}, "data_version": "4.0", "CVE_data_meta": {"ID": "CVE-2021-22865", "ASSIGNER": "product-cna@github.com"}}, "impact": {"baseMetricV2": {"cvssV2": {"version": "2.0", "baseScore": 4.3, "accessVector": "NETWORK", "vectorString": "AV:N/AC:M/Au:N/C:P/I:N/A:N", "authentication": "NONE", "integrityImpact": "NONE", "accessComplexity": "MEDIUM", "availabilityImpact": "NONE", "confidentialityImpact": "PARTIAL"}, "severity": "MEDIUM", "acInsufInfo": false, "impactScore": 2.9, "obtainAllPrivilege": false, "exploitabilityScore": 8.6, "obtainUserPrivilege": false, "obtainOtherPrivilege": false, "userInteractionRequired": true}, "baseMetricV3": {"cvssV3": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 6.5, "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N", "integrityImpact": "NONE", "userInteraction": "REQUIRED", "attackComplexity": "LOW", "availabilityImpact": "NONE", "privilegesRequired": "NONE", "confidentialityImpact": "HIGH"}, "impactScore": 3.6, "exploitabilityScore": 2.8}}, "publishedDate": "2021-04-02T18:15Z", "configurations": {"nodes": [{"children": [], "operator": "OR", "cpe_match": [{"cpe23Uri": "cpe:2.3:a:github:enterprise_server:*:*:*:*:*:*:*:*", "cpe_name": [], "vulnerable": true, "versionEndExcluding": "3.0.4", "versionStartIncluding": "3.0.0"}, {"cpe23Uri": "cpe:2.3:a:github:enterprise_server:*:*:*:*:*:*:*:*", "cpe_name": [], "vulnerable": true, "versionEndExcluding": "2.22.10", "versionStartIncluding": "2.22.0"}, {"cpe23Uri": "cpe:2.3:a:github:enterprise_server:*:*:*:*:*:*:*:*", "cpe_name": [], "vulnerable": true, "versionEndExcluding": "2.21.18"}]}], "CVE_data_version": "4.0"}, "lastModifiedDate": "2022-10-25T14:04Z"}