Tekton Pipelines: Git Resolver Unsanitized Revision Parameter Enables git Argument Injection Leading to RCE

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.

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

参数注入或修改

Tekton Pipelines 参数注入漏洞

Tekton Pipelines是Tekton开源的一个云原生管道。 Tekton Pipelines 1.0.0版本至1.11.0版本存在参数注入漏洞，该漏洞源于git解析器的revision参数直接作为位置参数传递给git fetch且未验证其不以-字符开头，可能导致攻击者注入任意git fetch标志，结合validateRepoURL函数明确允许以/开头的URL，能够提交ResolutionRequest对象的租户可链接这两种行为，在解析器pod上执行任意二进制文件。

N/A

N/A