PT-2023-25868 · Unknown · Tekton Pipelines
Wlynch
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Published
2023-07-07
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Updated
2024-08-20
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CVE-2023-37264
CVSS v3.1
3.7
Low
| Vector | AV:N/AC:H/PR:L/UI:R/S:U/C:L/I:L/A:N |
Name of the Vulnerable Software and Affected Versions
Tekton Pipelines versions 0.35.0 and later
Description
The Tekton Pipelines project provides k8s-style resources for declaring CI/CD-style pipelines. Starting in version 0.35.0, pipelines do not validate child UIDs, which means that a user that has access to create TaskRuns can create their own Tasks that the Pipelines controller will accept as the child Task. While the software stores and validates the PipelineRun's (api version, kind, name, uid) in the child Run's OwnerReference, it only stores (api version, kind, name) in the ChildStatusReference. This means that if a client had access to create TaskRuns on a cluster, they could create a child TaskRun for a pipeline with the same name + owner reference, and the Pipeline controller picks it up as if it was the original TaskRun. This is problematic since it can let users modify the config of Pipelines at runtime, which violates SLSA L2 Service Generated / Non-falsifiable requirements. This issue can be used to trick the Pipeline controller into associating unrelated Runs to the Pipeline, feeding its data through the rest of the Pipeline. This requires access to create TaskRuns, so impact may vary depending on one Tekton setup. If users already have unrestricted access to create any Task/PipelineRun, this does not grant any additional capabilities.
Recommendations
At the moment, there is no information about a newer version that contains a fix for this vulnerability.
Exploit
Insufficient Verification of Data Authenticity
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Weakness Enumeration
Related Identifiers
Affected Products
Tekton Pipelines