SB2020060401 - MitM attack in GnuTLS
Published: June 4, 2020
Security Bulletin ID
SB2020060401
Severity
Medium
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Adjecent network
Highest impact
Data manipulation
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 security vulnerability.
1) Man-in-the-Middle (MitM) attack (CVE-ID: CVE-2020-13777)
The vulnerability allows a remote attacker to perform Man-in-the-Middle (MitM) attack.
The vulnerability exists due to regression, introduced into the TLS protocol implementation that caused the TLS server to not securely construct a session ticket encryption key considering the application supplied secret. A remote attacker can bypass authentication in TLS 1.3 and recover previous conversations in TLS 1.2
Remediation
Install update from vendor's website.