[VulnWatch] CYBSEC - Multiple Vendor Web Vulnerability Scanner Arbitrary Script Injection Vulnerability

From: Mariano Nuņez Di Croce (mnunez_at_cybsec.com)
Date: 09/01/05

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    Date: Thu, 01 Sep 2005 12:47:42 -0300
To: vulnwatch@vulnwatch.org

    CYBSEC S.A.
    www.cybsec.com

    Advisory Name: Multiple Vendor Web Vulnerability Scanner Arbitrary
    ============= Script Injection Vulnerability

    Vulnerability Class: Script Injection
    ====================

    Release Date: 09.01.2005
    =============

    Affected Applications:
    ======================
    * N-Stealth Commercial Edition < 5.8.0.38
    * N-Stealth Free Edition < 5.8.1.03
    * Nikto <= 1.35

    Affected Platforms:
    ===================
    * Platform-Independent: Tested on Windows 2000 and Debian GNU/Linux

    Local / Remote: Remote
    ===============

    Severity: Medium
    =========

    Author: Mariano Nuņez Di Croce
    =======

    Vendor Status: Confirmed. Update released.
    ==============

    Reference to Vulnerability Disclosure Policy:
    =============================================
    http://www.cybsec.com/vulnerability_policy.pdf

    Overview:
    =========

    "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".

    Vulnerability Description:
    ==========================

    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.

    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.

    Special Thanks: Leandro Meiners.
    ===============
            
    Contact Information:
    ====================

    For more information regarding the vulnerability feel free to contact
    the author at mnunez {at} cybsec.com.

    For more information regarding CYBSEC: www.cybsec.com

    (c) 2005 - CYBSEC S.A. Security Systems

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