CVE-2022-4304

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.

• openssl openssl (>= 1.0.2 < 1.0.2zg) • openssl openssl (>= 1.1.1 < 1.1.1t) • openssl openssl (>= 3.0.0 < 3.0.8) • stormshield endpoint security (< 7.2.40) • stormshield sslvpn (< 3.2.1) • stormshield stormshield network security (>= 2.7.0 < 2.7.11) • stormshield stormshield network security (>= 2.8.0 < 3.7.34) • stormshield stormshield network security (>= 3.8.0 < 3.11.22) • stormshield stormshield network security (>= 4.0.0 < 4.3.16) • stormshield stormshield network security (>= 4.4.0 < 4.6.3)