Cosign is a project under the sigstore organization which aims to make signatures invisible infrastructure. In versions prior to 1.12.0 a number of vulnerabilities have been found in cosign verify-blob, where Cosign would successfully verify an artifact when verification should have failed. First a cosign bundle can be crafted to successfully verify a blob even if the embedded rekorBundle does not reference the given signature. Second, when providing identity flags, the email and issuer of a certificate is not checked when verifying a Rekor bundle, and the GitHub Actions identity is never checked. Third, providing an invalid Rekor bundle without the experimental flag results in a successful verification. And fourth an invalid transparency log entry will result in immediate success for verification. Details and examples of these issues can be seen in the GHSA-8gw7-4j42-w388 advisory linked. Users are advised to upgrade to 1.12.0. There are no known workarounds for these issues.
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History
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MITRE
Status: PUBLISHED
Assigner: GitHub_M
Published: 2022-09-14T19:50:09
Updated: 2024-08-03T09:52:00.499Z
Reserved: 2022-07-15T00:00:00
Link: CVE-2022-36056
Vulnrichment
No data.
NVD
Status : Modified
Published: 2022-09-14T20:15:09.860
Modified: 2024-11-21T07:12:16.937
Link: CVE-2022-36056
Redhat