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.

CVSS v3.0 5.5 MEDIUM

5.5^/10

CVSS v3.0 : MEDIUM

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 Patch Third Party Advisory

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Configurations

Configuration 1 (hide)

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

Information

Published : 2022-09-14 13:15

Updated : 2022-09-19 11:11

NVD link : CVE-2022-36056

Mitre link : CVE-2022-36056

JSON object : View

CWE

CWE-347

Improper Verification of Cryptographic Signature

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Products Affected

sigstore

cosign

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