An issue has been discovered in GitLab CE/EE affecting all versions starting from 16.9 prior to 16.9.7, starting from 16.10 prior to 16.10.5, and starting from 16.11 prior to 16.11.2. A problem with the processing logic for Discord Integrations Chat Messages can lead to a regular expression DoS attack on the server.
The product uses a regular expression with an inefficient, possibly exponential worst-case computational complexity that consumes excessive CPU cycles.
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Gitlab | Gitlab | 16.9.0 (including) | 16.9.7 (excluding) |
| Gitlab | Gitlab | 16.10.0 (including) | 16.10.5 (excluding) |
| Gitlab | Gitlab | 16.11.0 (including) | 16.11.2 (excluding) |
| Gitlab | Ubuntu | esm-apps/xenial | * |
Attackers can create crafted inputs that
intentionally cause the regular expression to use
excessive backtracking in a way that causes the CPU
consumption to spike.