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CVE PROGRAM SOURCE RECORD5.9 Medium

CVE-2022-4304

Timing Oracle in RSA Decryption

Read JSON ↗CVE.org ↗
Status
Published
Published
Updated
Assigning organization
openssl

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.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

OpenSSL OpenSSL

Default version status: unaffected

  • 3.0.0 to < 3.0.8affected
  • 1.1.1 to < 1.1.1taffected
  • 1.0.2 to < 1.0.2zgaffected

References