CVE Vulnerability

CVE-2022-36056

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.

5.5 /10

CVSS v3.0 : MEDIUM

V3 Legend

Vector :

Exploitability : 1.8 / Impact : 3.6

Attack Vector LOCAL

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact HIGH

Availability Impact NONE

Scope UNCHANGED

References
Link Resource
https://github.com/sigstore/cosign/commit/80b79ed8b4d28ccbce3d279fd273606b5cddcc25 Patch Third Party Advisory
https://github.com/sigstore/cosign/security/advisories/GHSA-8gw7-4j42-w388 Exploit Mitigation
Configurations

Configuration 1

cpe:2.3:a:sigstore:cosign:*:*:*:*:*:*:*:*
Information

Published : 2022-09-14 08:15

Updated : 2022-09-19 06:11

NVD link : CVE-2022-36056

Mitre link : CVE-2022-36056

Products Affected
No products.
CWE
CWE-347

Improper Verification of Cryptographic Signature