[NEWS] Multiple Vulnerabilities in Netgear FVS318 Router

From: SecuriTeam (support_at_securiteam.com)
Date: 01/23/05

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Date: 23 Jan 2005 14:21:48 +0200

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      Multiple Vulnerabilities in Netgear FVS318 Router
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    SUMMARY

    The <http://www.netgear.com> Netgear FVS318 is "an easy to use,
    firewall/router designed for home users and small businesses". SecuriNews
    Research has found 2 vulnerabilities in the router, one allows bypassing
    the product's content filtering mechanism while the other allows injecting
    arbitrary HTML and/or JavaScript into the product's log files which can
    then be used to attack the administrator of the router.

    DETAILS

    Content Filtering Bypass:
    By using HEX encoded characters, it is possible to bypass the URL filter.
    For example, if the router administrator blocks the phrase ".exe"; a user
    can encode one or more characters in the URL phrase to bypass the filter.
    If we encode the 'x' in ".exe", the new phrase ".e%78e" will bypass the
    filter.

    Log File Arbitrary Content Injection:
    The content filter/log viewer contains a Cross Site Scripting
    vulnerability. When a user tries to access a blocked URL phrase, it is
    logged in the Security Log. If a user were to inject JavaScript into a
    blocked URL phrase, the JavaScript would be executed by the
    administrator's browser when the security log is viewed.

    Proof of Concept:
    If the router administrator has blocked the URL phrase ".exe", a user can
    inject JavaScript as follows:
    http://www.example.com/somefile.exe><script>alert('XSS')</script>

    Note: The string "</textarea>" must be added before the injected
    JavaScript, as the security log is placed in a text area.

    ADDITIONAL INFORMATION

    The information has been provided by <mailto:advisories@securinews.com>
    Paul Kurczaba.
    The original article can be found at:
    <    http://www.securinews.com/vuln.htm?vulnid=103>
    http://www.securinews.com/vuln.htm?vulnid=103

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