An issue has been discovered in GitLab CE/EE affecting all versions starting from 7.8 before 16.9.6, all versions starting from 16.10 before 16.10.4, all versions starting from 16.11 before 16.11.1. Under certain conditions, an attacker with their Bitbucket account credentials may be able to take over a GitLab account linked to another users Bitbucket account, if Bitbucket is used as an OAuth 2.0 provider on GitLab.
Weakness
The authentication scheme or implementation uses key data elements that are assumed to be immutable, but can be controlled or modified by the attacker.
Affected Software
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Gitlab | Gitlab | 7.8.0 (including) | 16.9.6 (excluding) |
| Gitlab | Gitlab | 16.10.0 (including) | 16.10.4 (excluding) |
| Gitlab | Gitlab | 16.11.0 (including) | 16.11.0 (including) |
| Gitlab | Ubuntu | esm-apps/xenial | * |
| Gitlab-agent | Ubuntu | mantic | * |
| Gitlab-agent | Ubuntu | oracular | * |
| Gitlab-agent | Ubuntu | plucky | * |
Potential Mitigations
Related Attack Patterns
- https://cwe.mitre.org/data/definitions/10.html
- https://cwe.mitre.org/data/definitions/13.html
- https://cwe.mitre.org/data/definitions/21.html
- https://cwe.mitre.org/data/definitions/274.html
- https://cwe.mitre.org/data/definitions/31.html
- https://cwe.mitre.org/data/definitions/39.html
- https://cwe.mitre.org/data/definitions/45.html
- https://cwe.mitre.org/data/definitions/77.html