5.9 Medium
CVSS3
Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
NONE
Availability Impact
NONE
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
6.9 Medium
AI Score
Confidence
Low
2.6 Low
CVSS2
Access Vector
NETWORK
Access Complexity
HIGH
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
NONE
Availability Impact
NONE
AV:N/AC:H/Au:N/C:P/I:N/A:N
0.001 Low
EPSS
Percentile
49.4%
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.
The details of the vulnerability are on the https://people.redhat.com/~hkario/marvin/ page.
Script to reproduce it: https://github.com/tlsfuzzer/tlsfuzzer/blob/master/scripts/test-bleichenbacher-timing-pregenerate.py
Instructions to the reproducer: https://tlsfuzzer.readthedocs.io/en/latest/timing-analysis.html
Credit is acknowledged on the security advisory page: https://www.openssl.org/news/secadv/20230207.txt
Decryption of captured RSA ciphertexts and signature forgery for endpoints allowing timing of RSA decryption operation (local or remote).
5.9 Medium
CVSS3
Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
NONE
Availability Impact
NONE
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
6.9 Medium
AI Score
Confidence
Low
2.6 Low
CVSS2
Access Vector
NETWORK
Access Complexity
HIGH
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
NONE
Availability Impact
NONE
AV:N/AC:H/Au:N/C:P/I:N/A:N
0.001 Low
EPSS
Percentile
49.4%