Vulnerability identifier: #VU73960

Vulnerability risk: Medium

CVSSv3.1: 6.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2023-0464

CWE-ID: CWE-400

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 a denial of service (DoS) attack.

The vulnerability exists due to application does not properly control consumption of internal resources when verifying X.509 certificate chains that include policy constraints. A remote attacker can create a specially crafted certificate to trigger resource exhaustion and perform a denial of service (DoS) attack.

Mitigation
Install update from vendor's website.

Vulnerable software versions

OpenSSL: 3.1.0, 3.0.0 - 3.0.8, 1.0.2 - 1.0.2zg, 1.1.1 - 1.1.1t, 1.1.0 - 1.1.0l, 1.0.1 - 1.0.1u, 1.0.0 - 1.0.0t

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External links
http://www.openssl.org/news/secadv/20230322.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.