SB2023040605 - Amazon Linux AMI update for exim
Published: April 6, 2023
Security Bulletin ID
SB2023040605
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) Man-in-the-Middle (MitM) attack (CVE-ID: CVE-2021-38371)
The vulnerability allows a remote attacker to perform MitM attack.
The vulnerability exists due to the way Exim handles concurrent STARTTLS sessions when sending out emails. A malicious server can send a response to the *next* command within the existing STARTTLS sessions and force the Exim to treat this session as trusted.
Remediation
Install update from vendor's website.