Description
Tekton Pipelines project provides k8s-style resources for declaring CI/CD-style pipelines. From 1.0.0 to before 1.11.0, the git resolver's revision parameter is passed directly as a positional argument to git fetch without any validation that it does not begin with a - character. Because git parses flags from mixed positional arguments, an attacker can inject arbitrary git fetch flags such as --upload-pack=<binary>. Combined with the validateRepoURL function explicitly permitting URLs that begin with / (local filesystem paths), a tenant who can submit ResolutionRequest objects can chain these two behaviors to execute an arbitrary binary on the resolver pod. The tekton-pipelines-resolvers ServiceAccount holds cluster-wide get/list/watch on all Secrets, so code execution on the resolver pod enables full cluster-wide secret exfiltration. This vulnerability is fixed in 1.11.1.
Problem types
CWE-88: Improper Neutralization of Argument Delimiters in a Command ('Argument Injection')
Product status
References
github.com/...peline/security/advisories/GHSA-94jr-7pqp-xhcq
github.com/...peline/security/advisories/GHSA-94jr-7pqp-xhcq
github.com/tektoncd/pipeline/releases/tag/v1.11.1