CVE-2022-36056
MEDIUM5.5EPSS 0.02%Vulnerabilities with blob verification in sigstore cosign
Description
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.
Affected packages (3)
- Bitnami/cosignfrom 0, < 1.12.0
- Go/github.com/sigstore/cosignfrom 0, < 1.12.0
- Go/github.com/sigstore/cosignfrom 0, < 1.12.0
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | MEDIUM5.5 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N |
References (5)
- ADVISORYhttps://nvd.nist.gov/vuln/detail/CVE-2022-36056
- PATCHhttps://github.com/sigstore/cosign
- WEBhttps://github.com/sigstore/cosign/commit/80b79ed8b4d28ccbce3d279fd273606b5cddcc25
- WEBhttps://github.com/sigstore/cosign/releases/tag/v1.12.0
- WEBhttps://github.com/sigstore/cosign/security/advisories/GHSA-8gw7-4j42-w388