Date: Fri, 6 Nov 1998 01:46:17 -0600
From: owner-bugtraq@netspace.org
To: BUGTRAQ@netspace.org
Subject: various *lame* DoS attacks

Aleph,

None of this is as cool as finding buffer overflows in sshd, but it may be
of interest to some people.


2) CPU DoS against NukeNabber (NT only?)

I haven't tested this on anything other than Windows NT 4.0 SP3
(Workstation & Server)

How it works:

NukeNabber listens on several ports for connections.  You can configure it
to listen on any port, but the standards are 1080, etc.
If you telnet to the port of a machine that NukeNabber is listening on,
NukeNabber apparently spawns a process called Report.exe.  This process
lasts anywhere from 30-90 seconds, and consumes ~100% CPU.  The problem
with this is fairly obvious.  (note: when connecting to a port that
NukeNabber is listening on, it's important that you don't type anything.
Just let the connection sit and time out.)

Fix:

Unsure

Has the author been notified?

Yes, about 6 weeks ago.  I received no reply.


While we're on the subject of NukeNabber, I'll point something else out.
NukeNabber has a nifty feature that establishes a DDE link with an IRC
client. (mIRC or pirch)  There are scripts written for both clients that
have the option to kick/ban any host found to be "nuking" from all the
channels that you're oped in, and can also /ignore them.  This can become
interesting when someone has a version of WinNuke that can spoof a source
IP.  If a person has the kick/ban/ignore feature active, you can turn them
against the people in their channels quite easily.  Again, lots of fun to
be had here. (I believe the only "nuke" that NukeNabber listens for is a
WinNuke.)


I'm very aware that all the info presented here is rather lame. :)


s1