Vulnerability CVE-2021-22865


Published: 2021-04-02

Description:
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.

Type:

CWE-863

(Incorrect Authorization)

CVSS2 => (AV:N/AC:M/Au:N/C:P/I:N/A:N)

CVSS Base Score
Impact Subscore
Exploitability Subscore
4.3/10
2.9/10
8.6/10
Exploit range
Attack complexity
Authentication
Remote
Medium
No required
Confidentiality impact
Integrity impact
Availability impact
Partial
None
None
Affected software
Github -> Enterprise server 

 References:
https://docs.github.com/en/enterprise-server@2.21/admin/release-notes#2.21.18
https://docs.github.com/en/enterprise-server@2.22/admin/release-notes#2.22.10
https://docs.github.com/en/enterprise-server@3.0/admin/release-notes#3.0.4

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