Abraham Lincoln wrote:

> 1] Multiple DOS vulnerabilities with Kerio Mail Server services
>
> - By sending multiple "SYN" packet to every services of the mail
> server (POP3, SMTP, IMAP, Secure IMAP, POP3S, Web-mail, Secure
> Web-mail) it would stop the mail server services from responding.
> Sending minimum of 5 syn packet is enough to stop the service from
> responding and the service will be up again after several mins. This
> vulnerability consumes all resources of the system that forces the
> service to stop responding.
>

Defense against this type of DOS attack is a job of the underlying
operating system's TCP/IP stack. The following link contains information
on how to enable SYN flooding protection on Windows NT, 2000 or XP:

http://www.microsoft.com/technet/security/prodtech/network/secdeny.asp

> 2] Cross-Site Scripting vulnerabilities
>
> - Kerio's Web-Mail contains a Multiple Cross-site scripting
> vulnerabilities that could allow any user who's allowed to access the
> web-mail to execute Malicious scripts. Even Secure Web-mail is
> affected by this vulnerability.

Author of the advisory was not able to provide us with any details on
the XSS vulnerabilites he claims he found. The only information we got
was a link to XSS FAQ. Our internal testing did not reveal any security
holes.

We resolved all claims in this advisory as bogus - they don't contain
enough information to be of any value. There are no known and verified
security vulnerabilites in Kerio MailServer 5 that would be known to us.

Jaroslav Snajdr
Kerio MailServer Development Team
Kerio Technologies

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