#VU71716 Improper Verification of Cryptographic Signature in Mozilla Thunderbird - CVE-2023-0430

Vulnerability identifier: #VU71716

Vulnerability risk: Medium

CVSSv4.0: 6.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2023-0430

CWE-ID: CWE-347

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Mozilla Thunderbird
Client/Desktop applications / Messaging software

Vendor: Mozilla

Description

The vulnerability allows a remote attacker to perform spoofing attack.

The vulnerability exists due to application does not check certificate OCSP revocation status when verifying S/Mime signatures. A remote attacker can sign their emails with a revoked certificate and they will be displayed as having a valid signature.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Mozilla Thunderbird: 68.0 - 68.12.1, 78.0 - 78.15.0, 91.0 - 91.13.1, 102.0 - 102.7.0

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External links
https://www.mozilla.org/en-US/security/advisories/mfsa2023-04/

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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.