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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</textarea><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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