CVE-2022-4304
Vulnerability Summary
Timeline
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 Metrics
- v3.1•MEDIUM•Score: 5.9CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
EPSS Trends
Current EPSS score: 0.22%• Percentile: 45%
Techniques & Countermeasures
- CWE-203•Observable Discrepancy
The product behaves differently or sends different responses under different circumstances in a way that is observable to an unauthorized actor.
Affected Systems
- Crates.Io•openssl-src
< 111.25.0 | ≥ 300.0.0, < 300.0.12
- Unknown•OpenSSL
≥ 1.0.2, < 1.0.2zg | ≥ 1.1.1, < 1.1.1t | ≥ 3.0.0, < 3.0.8
- stormshield•endpoint_security
< 7.2.40
- stormshield•sslvpn
< 3.2.1
- stormshield•stormshield network security
≥ 2.7.0, < 2.7.11 | ≥ 2.8.0, < 3.7.34 | ≥ 3.8.0, < 3.11.22 | ≥ 4.0.0, < 4.3.16 | ≥ 4.4.0, < 4.6.3