CVE-2011-1506

Name of the Vulnerable Software and Affected Versions Kerio Connect versions 7.1.4 build 2985 Kerio MailServer versions 6.x

Description The issue is related to a "plaintext command injection" attack, where the STARTTLS implementation 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.

Recommendations For Kerio Connect version 7.1.4 build 2985, consider updating to a newer version that addresses the issue with I/O buffering in the STARTTLS implementation. For Kerio MailServer version 6.x, consider updating to a newer version that addresses the issue with I/O buffering in the STARTTLS implementation. As a temporary workaround, consider restricting access to the SMTP service to minimize the risk of exploitation.