Summary
The remote host is subject to the
'smad' attack(sendmail accept dos).
Description :
Smad prevents sendmail
from accepting legitimate connections.
A cracker may use this flaw to prevent you
from receiving any email, thus lowering the
interest of being connected to internet.
This attack is specific to some versions of the
Linux kernel.
There are various security bugs in the implementation of this service which can be used by an intruder to gain a root account rather easily.
Reference :
http://online.securityfocus.com/archive/1/11073
Solution
upgrade your Linux kernel to a newer version
or filter incoming traffic to this port.
