SB2023122812 - Bleichenbacher style attack in wolfSSL
Published: December 28, 2023
Security Bulletin ID
SB2023122812
Severity
Medium
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Remote access
Highest impact
Data manipulation
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 security vulnerability.
1) Use of a broken or risky cryptographic algorithm (CVE-ID: N/A)
The vulnerability allows a remote attacker to gain access to sensitive information.
The vulnerability exists due to usage of weak cryptographic ciphers susceptible to a Bleichenbacher style attack. A remote attacker can decrypt a saved TLS connection and potentially forge a signature after probing with a large number of trial connections.
Note, this issue is around RSA decryption and affects static RSA cipher suites on the server side, which are not recommended to be used and are off by default.
Remediation
Install update from vendor's website.