[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:mnunez@cybsec.com> Mariano
Nu ez Di Croce.

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