#VU74148 Improper Verification of Cryptographic Signature in OpenSSL - CVE-2023-0465

Vulnerability identifier: #VU74148

Vulnerability risk: Low

CVSSv4.0: 1.7 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2023-0465

CWE-ID: CWE-347

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
OpenSSL
Server applications / Encryption software

Vendor: OpenSSL Software Foundation

Description

The vulnerability allows a remote attacker to perform MitM attack.

The vulnerability exists due to an error when validating certificate policies in leaf certificates. A remote attacker that controls a malicious CA server can issue a certificate that will be validated by the application.

Mitigation
Install update from vendor's website.

Vulnerable software versions

OpenSSL: 1.0, 1.0.0o - 1.0.0p, 1.0.1n - 1.0.1p, 1.0.2l - 1.0.2p, 1.1.0e - 1.1.0, 1.1.1j - 1.1.1p, 3.0.0 - 3.0.8, 3.1.0

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External links
https://www.openssl.org/news/secadv/20230328.txt

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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.