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medium5.9

CVE-2022-4304

openssl-src subject to Timing Oracle in RSA Decryption

Impact

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 packages

EcosystemPackageAffectedFixed in
rustopenssl-src< 111.25.0111.25.0

Affected products

VendorProductAffected versions
OpensslOpenssl
from 1.0.2 before 1.0.2zg
from 1.1.1 before 1.1.1t
from 3.0.0 before 3.0.8
StormshieldEndpoint Security
before 7.2.40
StormshieldSslvpn
before 3.2.1
StormshieldStormshield Network Security
from 2.7.0 before 2.7.11
from 2.8.0 before 3.7.34
from 3.8.0 before 3.11.22
from 4.0.0 before 4.3.16
from 4.4.0 before 4.6.3

Weakness classification

CWE-203

References