full-disclosure - Cox is blocking port 135

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From: listuser at seifried.org (Kurt Seifried)
Subject: Cox is blocking port 135 - off topic

Off topic:

This won't help much at all. Windows 2000/XP run Microsoft SMB over TCP on
445 as well (reduced overhead then 135/etc, no NetBIOS layer). When a client
tries to connect to a remote host for file/print sharing/etc it connects on
both ports 135 and 445, if a response is recieved from port 445 it drops the
connection to 135. THe attack works quite well against client systems using
port 445. If Cox blocks both ports 135 and 445 that will be semi-effective
(except of course for internal users who spread a worm/etc, such as laptops
that move around). THis may block a few of the more stupid attacks but not
for long.

Kurt Seifried, kurt@...fried.org
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http://seifried.org/security/