CVE-2022-4304 Timing Oracle in RSA Decryption

What is CVE-2022-4304?

CVE-2022-4304 is a medium-severity vulnerability in Openssl Openssl, published on 8 Feb 2023. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

A timing based side channel exists in the OpenSSL RSA Decryption implementation which could be sufficient to recover a plaintext across a network in a Bleichenbacher style attack. 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.

For example, in a TLS connection, RSA is commonly used by a client to send an encrypted pre-master secret to the server. An attacker that had observed a genuine connection between a client and a server could use this flaw to send trial messages to the server and record the time taken to process them. After a sufficiently large number of messages the attacker could recover the pre-master secret used for the original connection and thus be able to decrypt the application data sent over that connection.

Weakness: CWE-203

Which versions are affected by CVE-2022-4304?

5 open source packages ship an affected version, including openssl-src. It affects 4 products.

Products include Openssl Openssl, Stormshield Endpoint Security, Stormshield Sslvpn, Stormshield Stormshield Network Security.

How do I fix CVE-2022-4304?

Upgrade openssl-src to a fixed version for your release line: 111.25.0 or 300.0.12.

Is CVE-2022-4304 being exploited?

There is no known exploitation of CVE-2022-4304 in the wild and no public exploit code.

Public exploit code: 1 proofs of concept on GitHub.

Other vulnerabilities in Openssl Openssl

• CVE-2009-3245 Null dereference in n/a Critical 10.0
• CVE-2006-3738 Memory corruption in n/a Critical 10.0
• CVE-2026-63073 Untrusted Sender DN Used as Format String in CMP Response Validation Critical 9.8
• CVE-2016-6309 Use after free in n/a Critical 9.8
• CVE-2016-0799 Integer overflow in n/a Critical 9.8

All Openssl Openssl vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as ALPINE-CVE-2022-4304, AZL-13302, AZL-13310, AZL-31140, AZL-34668, AZL-37662 and 19 more.