CVE-2021-22178: 
GitLab vulnerability analysis and mitigation

An issue was discovered in GitLab affecting all versions starting from 13.2, identified as CVE-2021-22178. The vulnerability involved a Server-Side Request Forgery (SSRF) attack vector through the Prometheus integration service. This security flaw was reported through GitLab's HackerOne bug bounty program and was publicly disclosed on February 11, 2021 (GitLab Release).

The vulnerability is classified as CWE-918 (Server-Side Request Forgery) with a CVSS v3.1 Base Score of 5.0 (Medium) and vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:N. The issue specifically affected the Prometheus integration service in GitLab, allowing potential SSRF attacks through the API URL and Google IAP Service Account JSON configuration (NVD).

The SSRF vulnerability allowed attackers to issue arbitrary POST requests into local networks. The severity of the impact could vary depending on the services running on the local network. For instance, if a Docker daemon was listening on localhost:2375, attackers could potentially read files by issuing POST requests to build images from remote dockerfiles (GitLab Issue).

GitLab addressed this vulnerability in versions 13.8.4, 13.7.7, and 13.6.7 for both Community Edition (CE) and Enterprise Edition (EE). Users were strongly recommended to upgrade their GitLab installations to one of these patched versions immediately (GitLab Release).