PHP exploit (Was Re: Wave of Nimda-like hits this morning?)

[Chris Adams <chris () improbable org>]

On Tuesday, February 26, 2002, at 12:28 , Jay D. Dyson wrote:
> > Whatever this (maybe) new bug is, it's blowing up these boxes left and
> > right...can't figure it out.  They're all relatively new 1.3'ish
> > versions I think.
>
>         I've heard rumblings of an Apache/PHP exploit making the rounds.
> Any of these machines using PHP by chance?

This just hit the snort-sigs list this afternoon:

From: Brian <bmc () snort org>
Date: Tue Feb 26, 2002  04:02:22  US/Pacific
Subject: [Snort-sigs] php overflow signatures

Below are the initial signatures for the PHP overflow that is about to
get a bunch of publication.  Have fun and whatnot.

Sourceforge's CVS server is broken, so these are not yet in CVS.

alert tcp $EXTERNAL_NET any -> $HOME_NET 80 (msg:"EXPERIMENTAL php 
content-disposition memchr overlfow"; flags:A+; 
content:"Content-Disposition\:"; content:"name=\"|CC CC CC CC CC|"; 
classtype:web-application-attack; sid:1423; rev:1;)

alert ip $EXTERNAL_NET any -> $HOME_NET any (msg:"EXPERIMENTAL SHELLCODE 
x86 EB OC NOOP"; content:"|EB 0C EB 0C EB 0C EB 0C EB 0C EB 0C EB 0C EB 
0C|"; classtype:shellcode-detect; sid:1424; rev:1;)

alert tcp $EXTERNAL_NET any -> $HOME_NET 80 (msg:"EXPERIMENTAL php 
content-disposition"; flags:A+; content:"Content-Disposition\:"; 
content:"form-data\;"; classtype:web-application-attack; sid:1425; 
rev:1;)


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