A time-of-check time-of-use race condition vulnerability was identified in GitHub Enterprise Server that allowed remote code execution. Exploitation required an authenticated user with write access to a repository and precise timing of concurrent upload requests. This vulnerability affected all versions of GitHub Enterprise Server prior to 3.22 and was fixed in versions 3.17.20, 3.18.14, 3.19.11, 3.20.7, and 3.21.5.
This vulnerability was reported via the GitHub Bug Bounty program.
Attack Parameters
Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Attack Requirements
Present
Additional conditions required
Privileges Required
Low
Basic privileges needed
User Interaction
None
No user interaction needed
Impact Assessment
Confidentiality
High
Complete data leak
Integrity
High
Complete data modification
Availability
High
Complete denial of service
CVSS Vector v4.0
Weakness Type (CWE)
Vulnerable Products 5
| Configuration | From (including) | Up to (excluding) |
|---|---|---|
|
Github Enterprise_Server
cpe:2.3:a:github:enterprise_server:*:*:*:*:*:*:*:*
|
— |
3.17.20
|
|
Github Enterprise_Server
cpe:2.3:a:github:enterprise_server:*:*:*:*:*:*:*:*
|
3.18.0
|
3.18.14
|
|
Github Enterprise_Server
cpe:2.3:a:github:enterprise_server:*:*:*:*:*:*:*:*
|
3.19.0
|
3.19.11
|
|
Github Enterprise_Server
cpe:2.3:a:github:enterprise_server:*:*:*:*:*:*:*:*
|
3.20.0
|
3.20.7
|
|
Github Enterprise_Server
cpe:2.3:a:github:enterprise_server:*:*:*:*:*:*:*:*
|
3.21.0
|
3.21.5
|
References 5
https://docs.github.com/en/enterprise-server@3.17/admin/release-notes#3.17.20
NVD
https://docs.github.com/en/enterprise-server@3.18/admin/release-notes#3.18.14
NVD
https://docs.github.com/en/enterprise-server@3.19/admin/release-notes#3.19.11
NVD
https://docs.github.com/en/enterprise-server@3.20/admin/release-notes#3.20.7
NVD
https://docs.github.com/en/enterprise-server@3.21/admin/release-notes#3.21.5
NVD