Kerio MailServer Webmail Malformed Email Handling Resource Exhaustion DoS

This script is Copyright (C) 2005-2012 Tenable Network Security, Inc.


Synopsis :

The remote mail server is prone to a denial of service attack.

Description :

According to its banner, the remote host is running a version of Kerio
MailServer prior to 6.0.9. Such versions may be subject to hangs or
high CPU usage when malformed email messages are viewed through its
WebMail component. An attacker may be able leverage this issue to deny
service to legitimate users simply by sending a specially crafted
message and having that message viewed by someone using Kerio WebMail.

See also :

http://www.kerio.com/kms_history.html

Solution :

Upgrade to Kerio MailServer 6.0.9 or newer.

Risk factor :

High / CVSS Base Score : 7.1
(CVSS2#AV:N/AC:M/Au:N/C:N/I:N/A:C)
CVSS Temporal Score : 5.3
(CVSS2#E:U/RL:OF/RC:C)
Public Exploit Available : false

Family: Denial of Service

Nessus Plugin ID: 18058 (kerio_webmail_609.nasl)

Bugtraq ID: 13180

CVE ID: CVE-2005-1138