CVE-2011-1506: Input Validation
The STARTTLS implementation in Kerio Connect 7.1.4 build 2985 and MailServer 6.x does not properly restrict I/O buffering, which 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, related to a "plaintext command injection" attack, a similar issue to CVE-2011-0411. NOTE: some of these details are obtained from third party information.
Affected Software
Event History
Frequently Asked Questions
What is the severity of CVE-2011-1506?
CVE-2011-1506 is classified as a medium severity vulnerability due to its potential to allow man-in-the-middle attacks during encrypted SMTP sessions.
How do I fix CVE-2011-1506?
To fix CVE-2011-1506, update your Kerio Connect or Kerio MailServer to the latest version that addresses this vulnerability.
What systems are affected by CVE-2011-1506?
CVE-2011-1506 affects Kerio Connect version 7.1.4 and several versions of Kerio MailServer from 5.0 to 6.7.3.
Can a man-in-the-middle attack exploit CVE-2011-1506?
Yes, CVE-2011-1506 allows an attacker to insert commands into an encrypted SMTP session, enabling man-in-the-middle attacks.
Is there a workaround for CVE-2011-1506 if I cannot update?
If an update is not possible, consider implementing additional network security measures to monitor and restrict unauthorized access.