SUSE-SU-2023:2633-1

Описание

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.

Затронутые продукты

Ссылки

• https://www.suse.com/security/cve/CVE-2022-4304.html
  CVE-2022-4304
• https://bugzilla.suse.com/1207534
  SUSE Bug 1207534
• https://bugzilla.suse.com/1210067
  SUSE Bug 1210067
• https://bugzilla.suse.com/1213146
  SUSE Bug 1213146
• https://bugzilla.suse.com/1213289
  SUSE Bug 1213289
• https://bugzilla.suse.com/1215014
  SUSE Bug 1215014