PT-2011-3173 · Kerio · Kerio Mailserver+1

Wietse Venema · Published 2011-03-22 · Updated 2017-08-17 · CVE-2011-1506

Positive Technologies (AI Summary)

CVSS v2.0

6.8

Medium

Base vector

AV:N/AC:M/Au:N/C:P/I:P/A:P

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.

Fix

RCE

Weakness Enumeration

CWE-20

Related Identifiers

CVE-2011-1506

Affected Products

Kerio Connect

Kerio Mailserver

References · 7

• https://nvd.nist.gov/vuln/detail/CVE-2011-1506 · Security Note
• http://secunia.com/advisories/43678 · Vendor Advisory
• http://vupen.com/english/advisories/2011/0610 · Vendor Advisory
• https://exchange.xforce.ibmcloud.com/vulnerabilities/65932 · Note
• http://kb.cert.org/vuls/id/MAPG-8D9M4P · Note
• http://kb.cert.org/vuls/id/555316 · Note
• http://securityfocus.com/bid/46767 · Note