RE: TippingPoint IPS Signature Evasion

This is exploitable (and tested) against IIS 5/5.1 (IIS6/7 are not vulnerable)
However, potentially other web servers are also vulnerable if they are capable of decoding alternate unicode characters.

I also agree with you, blaming an IPS for not detecting attack which is impossible in the wild would be very pointless. Although IIS 5 is old, it is still relatively common.

Any further questions, feel free to ask.

Cheers,

Paul Craig
Security Consultant
Security-Assessment.com

-----Original Message-----

From: 3APA3A [mailto:3APA3A@SECURITY.NNOV.RU] Sent: Thursday, 12 July 2007 2:30 a.m.
To: Paul Craig
Cc: bugtraq@securityfocus.com; full-disclosure@lists.grok.org.uk Subject: Re: TippingPoint IPS Signature Evasion

Dear Paul Craig,

--Wednesday, July 11, 2007, 1:37:03 AM, you wrote to
bugtraq@securityfocus.com:

PC> 
http://www.test.com/scripts%c0%afcmd.exe
PC> 
http://www.test.com/scripts%e0%80%afcmd.exe
PC> 
http://www.test.com/scripts%c1%9ccmd.exe

PC> Web servers located behind a Tippingpoint IPS device which are capable

Do you need help?

In addition to our free technical library, Pantek provides professional IT services to companies who utilize Open Source software: Learn more about Pantek's Technical Support offerings Place an order for 24/7/365 Technical Support here Learn more about Pantek, who we are, and what we do Chat with a Live Operator Related securityfocus.com Links bugtraq certification focus-bsd focus-ids focus-ih focus-linux focus-ms focus-sun focus-unix-other focus-virus forensics incidents libnet linux-secnews ms-secnews pen-test secpapers secprog sectools secureshell security-basics securityjobs sf-news vuln-dev webappsec Request more information about Pantek

Can you, please, provide example of such server? Fatih Ozavci reported similar problem with Checkpoint and Halfwidth/Fullwidth Unicode, potential attack vector was IIS with .Net framework, in this case IIS seems not to be exploitable.

Blaming IPS it does not detect attack which is impossible in-the-wild is nonsense. Blaming corporate-level IPS doesn't detect attack against SOHO web server is acceptable nonsense :)

--

~/ZARAZA http://securityvulns.com/ Received on Wed Jul 11 17:11:00 2007