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"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. |
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Credit:
The information has been provided by Mariano Nu ez Di Croce.
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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.
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.
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
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