Re: NSLOOKUP.EXE

From: Nexus (nexusat_private-way.co.uk)
Date: Fri Mar 21 2003 - 02:15:41 PST

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----- Original Message -----
From: "Patrick Webster" <webster_pat_private>
To: "Blue Boar" <BlueBoarat_private>
Cc: <vuln-devat_private>
Sent: Thursday, March 20, 2003 10:28 PM
Subject: RE: NSLOOKUP.EXE

I get an Input too long error if run through cmd.exe, eg. c:\>nslookup.exe
AAAAA[..], but if I run nslookup with no args, then request AAA[..]AAA it
gives the 0x41414141 memory error.

If I give nslookup a much larger amount of A's, the response is:

(null)    dns.server.net

then crashes.

-Patrick

This has been around for a while - I seem to recall looking at this a couple
of years ago but since the overflow (on quick inspection) looked tricky to
exploit *and* it's the client end that overflows, I didn't bother with it.
There is no local priv escalation and you would need control of the victims'
DNS servers - in which case, you can do far more interesting things that
this ;-)   The only use I could think of it was when you are in a restricted
environment and can only use sanctioned commands, with nslookup being one of
them.

Cheers.

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