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Multiple Vulnerabilities in Netgear FVS318 Router

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&lt;/textarea&gt;&lt;script&gt;alert&#40;&#39;XSS&#39;&#41;&lt;/script&gt;

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:[email protected]>
Paul Kurczaba.
The original article can be found at:
<http://www.securinews.com/vuln.htm?vulnid=103&gt;
http://www.securinews.com/vuln.htm?vulnid=103

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