Vulnerability Details CVE-2023-47122
Gitsign is software for keyless Git signing using Sigstore. In versions of gitsign starting with 0.6.0 and prior to 0.8.0, Rekor public keys were fetched via the Rekor API, instead of through the local TUF client. If the upstream Rekor server happened to be compromised, gitsign clients could potentially be tricked into trusting incorrect signatures. There is no known compromise the default public good instance (`rekor.sigstore.dev`) - anyone using this instance is unaffected. This issue was fixed in v0.8.0. No known workarounds are available.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.001
EPSS Ranking 26.6%
CVSS Severity
CVSS v3 Score 4.2
References
- https://docs.sigstore.dev/about/threat-model/#sigstore-threat-model
- https://github.com/sigstore/gitsign/commit/cd66ccb03c86a3600955f0c15f6bfeb75f697236
- https://github.com/sigstore/gitsign/pull/399
- https://github.com/sigstore/gitsign/security/advisories/GHSA-xvrc-2wvh-49vc
- https://docs.sigstore.dev/about/threat-model/#sigstore-threat-model
- https://github.com/sigstore/gitsign/commit/cd66ccb03c86a3600955f0c15f6bfeb75f697236
- https://github.com/sigstore/gitsign/pull/399
- https://github.com/sigstore/gitsign/security/advisories/GHSA-xvrc-2wvh-49vc