vulnerability
OpenSSL vulnerability (CVE-2022-4304)
Severity | CVSS | Published | Added | Modified |
---|---|---|---|---|
7 | (AV:N/AC:M/Au:N/C:C/I:N/A:N) | 02/08/2023 | 02/08/2023 | 02/17/2025 |
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.
Solution(s)

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