#VU71993 Information Exposure Through Timing Discrepancy in OpenSSL - CVE-2022-4304

Vulnerability identifier: #VU71993

Vulnerability risk: Medium

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

CVE-ID: CVE-2022-4304

CWE-ID: CWE-208

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 obtain sensitive information.

The vulnerability exists due to a timing based side channel exists in the OpenSSL RSA Decryption implementation. A remote attacker can perform a Bleichenbacher style attack and decrypt data sent over the network.

To achieve a successful decryption an attacker would have to be able to send a very large number of trial messages for decryption. The vulnerability affects all RSA padding modes: PKCS#1 v1.5, RSA-OEAP and RSASVE.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

OpenSSL: 1.0, 1.0.0f - 1.0.0p, 1.0.1u - 1.0.1p, 1.0.2n - 1.0.2p, 1.1.0d - 1.1.0, 1.1.1i - 1.1.1p, 3.0.0 - 3.0.7

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External links
http://www.openssl.org/news/secadv/20230207.txt
http://www.tenable.com/security/tns-2023-11

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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.