CVE-2022-4304

A timing based side channel exists in the OpenSSL RSA Decryption implementation<br /> which could be sufficient to recover a plaintext across a network in a<br /> Bleichenbacher style attack. To achieve a successful decryption an attacker<br /> would have to be able to send a very large number of trial messages for<br /> decryption. The vulnerability affects all RSA padding modes: PKCS#1 v1.5,<br /> RSA-OEAP and RSASVE.<br /> <br /> For example, in a TLS connection, RSA is commonly used by a client to send an<br /> encrypted pre-master secret to the server. An attacker that had observed a<br /> genuine connection between a client and a server could use this flaw to send<br /> trial messages to the server and record the time taken to process them. After a<br /> sufficiently large number of messages the attacker could recover the pre-master<br /> secret used for the original connection and thus be able to decrypt the<br /> application data sent over that connection.