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MEDIUM · 5.9

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 success...

Vulnerability 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.

CVSS Score

5.9

MEDIUM

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
NONE
Availability
NONE

Affected Products

VendorProductVersions
OpensslOpenssl>= 1.0.2, < 1.0.2zg
StormshieldEndpoint Security< 7.2.40
StormshieldSslvpn< 3.2.1
StormshieldStormshield Network Security>= 2.7.0, < 2.7.11

Related Weaknesses (CWE)

CWE-203

References

FAQ

What is CVE-2022-4304?

CVE-2022-4304 is a vulnerability with a CVSS score of 5.9 (MEDIUM). 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 success...

How severe is CVE-2022-4304?

CVE-2022-4304 has been rated MEDIUM with a CVSS base score of 5.9/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2022-4304?

Check the references section above for vendor advisories and patch information. Affected products include: Openssl Openssl, Stormshield Endpoint Security, Stormshield Sslvpn, Stormshield Stormshield Network Security.