A command injection vulnerability was discovered in Gitlab runner versions prior to 13.2.4, 13.3.2 and 13.4.1. When the runner is configured on a Windows system with a docker executor, which allows the attacker to run arbitrary commands on Windows host, via DOCKER_AUTH_CONFIG build variable.
Credits
Thanks [ajxchapman](https://hackerone.com/ajxchapman) for reporting this vulnerability through our HackerOne bug bounty program
