Improper Certificate Validation Affecting cosign package, versions <1.5.2-r0
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-ALPINE319-COSIGN-6106280
- published8 Dec 2023
- disclosed18 Feb 2022
Introduced: 18 Feb 2022
CVE-2022-23649 (opens in a new tab)How to fix?
Upgrade Alpine:3.19 cosign to version 1.5.2-r0 or higher.
NVD Description
Note: Versions mentioned in the description apply only to the upstream cosign package and not the cosign package as distributed by Alpine.
See How to fix? for Alpine:3.19 relevant fixed versions and status.
Cosign provides container signing, verification, and storage in an OCI registry for the sigstore project. Prior to version 1.5.2, Cosign can be manipulated to claim that an entry for a signature exists in the Rekor transparency log even if it doesn't. This requires the attacker to have pull and push permissions for the signature in OCI. This can happen with both standard signing with a keypair and "keyless signing" with Fulcio. If an attacker has access to the signature in OCI, they can manipulate cosign into believing the entry was stored in Rekor even though it wasn't. The vulnerability has been patched in v1.5.2 of Cosign. The signature in the signedEntryTimestamp provided by Rekor is now compared to the signature that is being verified. If these don't match, then an error is returned. If a valid bundle is copied to a different signature, verification should fail. Cosign output now only informs the user that certificates were verified if a certificate was in fact verified. There is currently no known workaround.