{"id":"BIT-cosign-2022-36056","summary":" Vulnerabilities with blob verification in sigstore cosign","details":"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.","aliases":["CVE-2022-36056","GHSA-8gw7-4j42-w388","GO-2022-0998"],"modified":"2026-09-08T08:46:02.922441597Z","published":"2024-03-06T10:51:15.106Z","database_specific":{"severity":"Medium","cpes":["cpe:2.3:a:sigstore:cosign:*:*:*:*:*:*:*:*"]},"references":[{"type":"ADVISORY","url":"https://github.com/sigstore/cosign/commit/80b79ed8b4d28ccbce3d279fd273606b5cddcc25"},{"type":"ADVISORY","url":"https://github.com/sigstore/cosign/security/advisories/GHSA-8gw7-4j42-w388"},{"type":"WEB","url":"https://nvd.nist.gov/vuln/detail/CVE-2022-36056"}],"affected":[{"package":{"name":"cosign","ecosystem":"Bitnami","purl":"pkg:bitnami/cosign"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"1.12.0"}]}],"database_specific":{"source":"https://github.com/bitnami/vulndb/tree/main/data/cosign/BIT-cosign-2022-36056.json"},"severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N"}]}],"schema_version":"1.9.0"}