Security restrictions bypass in Cosign



Published: 2022-10-04
Risk Medium
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2022-36056
CWE-ID CWE-347
Exploitation vector Network
Public exploit N/A
Vulnerable software
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Vendor Sigstore

Security Bulletin

This security bulletin contains one medium risk vulnerability.

1) Improper Verification of Cryptographic Signature

EUVDB-ID: #VU67910

Risk: Medium

CVSSv3.1: 4.6 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2022-36056

CWE-ID: CWE-347 - Improper Verification of Cryptographic Signature

Exploit availability: No

Description

The vulnerability allows a remote attacker to bypass implemented security restrictions.

The vulnerability exists due to improper verification of signature when processing artifacts. A remote attacker can supply a specially crafted artifact and bypass the implemented blob verification process.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Cosign: 0.1.0 - 1.11.1

External links

http://github.com/sigstore/cosign/commit/80b79ed8b4d28ccbce3d279fd273606b5cddcc25
http://github.com/sigstore/cosign/security/advisories/GHSA-8gw7-4j42-w388


Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.



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