Description
Tekton Pipelines project provides k8s-style resources for declaring CI/CD-style pipelines. From 0.43.0 to 1.11.0, trusted resources verification policies match a resource source string (refSource.URI) against spec.resources[].pattern using regexp.MatchString. In Go, regexp.MatchString reports a match if the pattern matches anywhere in the string, so common unanchored patterns (including examples in tekton documentation) can be bypassed by attacker-controlled source strings that contain the trusted pattern as a substring. This can cause an unintended policy match and change which verification mode/keys apply.
Problem types
CWE-185: Incorrect Regular Expression
Product status
References
github.com/...peline/security/advisories/GHSA-rmx9-2pp3-xhcr
github.com/...ommit/b8905600322aa86327baae0a7c04d6cf1207362a