SB2021021106 - MitM-attack in BIG-IP SSL/TLS implementation
Published: February 11, 2021
Security Bulletin ID
SB2021021106
Severity
Low
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) Cryptographic issues (CVE-ID: CVE-2021-22981)
The vulnerability allows a remote attacker to perform MitM attack.
The vulnerability exists due to the original TLS protocol includes a weakness in the master secret negotiation that is mitigated by the Extended Master Secret (EMS) extension defined in RFC 7627. TLS connections that do not use EMS are vulnerable to man-in-the-middle attacks during renegotiation.
Remediation
Install update from vendor's website.