Information Exposure Affecting openssl package, versions <3.0.2-0ubuntu1.8
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Test your applications- Snyk ID SNYK-UBUNTU2204-OPENSSL-3314710
- published 8 Feb 2023
- disclosed 8 Feb 2023
Introduced: 8 Feb 2023
CVE-2022-4304 Open this link in a new tabHow to fix?
Upgrade Ubuntu:22.04 openssl to version 3.0.2-0ubuntu1.8 or higher.
NVD Description
Note: Versions mentioned in the description apply only to the upstream openssl package and not the openssl package as distributed by Ubuntu.
See How to fix? for Ubuntu:22.04 relevant fixed versions and status.
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.