CVE-2011-1431

Name of the Vulnerable Software and Affected Versions netqmail versions 1.06

Description The issue is related to the STARTTLS implementation in qmail-smtpd, which does not properly restrict I/O buffering. This allows man-in-the-middle attackers to insert commands into encrypted SMTP sessions by sending a cleartext command that is processed after TLS is in place. The attack is referred to as a "plaintext command injection" attack.

Recommendations For netqmail version 1.06, consider disabling the STARTTLS implementation until a patch is available to properly restrict I/O buffering and prevent plaintext command injection attacks. Restrict access to the SMTP service to minimize the risk of exploitation.