[NEWS] Multiple Vendor Web Vulnerability Scanner Arbitrary DHTML Injection

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  Multiple Vendor Web Vulnerability Scanner Arbitrary DHTML Injection
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SUMMARY

"N-Stealth is a vulnerability-assessment product that scans web servers to 
identify security problems and weaknesses that may allow an attacker to 
gain privileged access.The software comes with an extensive database of 
over 30,000 vulnerabilities and exploits".

"Nikto is an Open Source (GPL) web server scanner which performs 
comprehensive tests against web servers for multiple items, including over 
3200 potentially dangerous files/CGIs, versions on over 625 servers, and 
version specific problems on over 230 servers".

A bug exists in the way multiple web vulnerability scanners process 
responses received from the host being scanned.

If the target host has modified the "Server" field of the HTTP Response 
headers, including DHTML code in it, this code will be executed by the 
browser when the HTML report is generated. It's important to emphasize 
that this code will be executed under "My Computer" Security Zone when 
viewed with IE.

DETAILS

Vulnerable Systems:
 * N-Stealth Commercial Edition version 5.8.0.37 and prior
 * N-Stealth Free Edition version 5.8.1.02 and prior
 * Nikto version 1.35 and prior

Immune Systems:
 * N-Stealth Commercial Edition version 5.8.0.38 or newer
 * N-Stealth Free Edition version 5.8.1.03 or newer
 * Nikto version 1.36 or newer

Proof of Concept (using mod_security):
SecServerSignature "Microsoft-IIS/5.0<script>alert('test')</script>"

Besides, in N-Stealth main dialog, the Server header is displayed up to 
its 54th character. So, with the correct blank padding after the fake 
version banner, the DHTML code won't be noticed in this window.

Solutions:
N-Stealth vendor has released an update that fixes the vulnerability. 
Update can be downloaded at  <http://www.nstalker.com> 
http://www.nstalker.com.

Nikto vendor has released an update that warns the user of dangers in 
viewing HTML reports. Update can be downloaded at  <http://www.cirt.net> 
http://www.cirt.net.

Vendor Response:
07.26.2005 - Vendors Notified
07.26.2005 - Nikto Vendor Confirmed Vulnerability
07.26.2005 - Nikto Vendor Supplied Update
08.15.2005 - N-Stealth Vendor Confirmed Vulnerability
08.25.2005 - N-Stealth Vendor Supplied Update
09.01.2005 - Vulnerability Public Disclosure


ADDITIONAL INFORMATION

The information has been provided by  <mailto:[email protected]> Mariano 
Nu ez Di Croce.



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