Improper Verification of Cryptographic Signature Affecting cosign package, versions <1.10.1-150400.3.3.1


Severity

Recommended
0.0
medium
0
10

Based on SUSE Linux Enterprise Server security rating.

Threat Intelligence

EPSS
0.06% (19th percentile)

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  • Snyk IDSNYK-SLES154-COSIGN-2989756
  • published24 Aug 2022
  • disclosed23 Aug 2022

Introduced: 23 Aug 2022

CVE-2022-35929  (opens in a new tab)
CWE-347  (opens in a new tab)

How to fix?

Upgrade SLES:15.4 cosign to version 1.10.1-150400.3.3.1 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 SLES. See How to fix? for SLES:15.4 relevant fixed versions and status.

cosign is a container signing and verification utility. In versions prior to 1.10.1 cosign can report a false positive if any attestation exists. cosign verify-attestation used with the --type flag will report a false positive verification when there is at least one attestation with a valid signature and there are NO attestations of the type being verified (--type defaults to "custom"). This can happen when signing with a standard keypair and with "keyless" signing with Fulcio. This vulnerability can be reproduced with the distroless.dev/static@sha256:dd7614b5a12bc4d617b223c588b4e0c833402b8f4991fb5702ea83afad1986e2 image. This image has a vuln attestation but not an spdx attestation. However, if you run cosign verify-attestation --type=spdx on this image, it incorrectly succeeds. This issue has been addressed in version 1.10.1 of cosign. Users are advised to upgrade. There are no known workarounds for this issue.

CVSS Base Scores

version 3.1