[UNIX] PHProxy Cross Site Scripting

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To: list@securiteam.com
Date: 27 Dec 2004 11:37:55 +0200

The following security advisory is sent to the securiteam mailing list, and can be found at the SecuriTeam web site: http://www.securiteam.com
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  PHProxy Cross Site Scripting
------------------------------------------------------------------------

SUMMARY

 <http://www.whitefyre.com/poxy/> PHProxy is "a web HTTP (for now; FTP is
not supprted yet) proxy programmed in PHP designed to bypass firewalls and
other proxy restrictions through a web interface very similar to the
popular CGIProxy".

A vulnerability in the PHProxy's handling of incoming user provided data
allows an attacker to use the PHP script for a cross site scripting
vulnerability.

DETAILS

Vulnerable Systems:
 * PHProxy version 0.3 and prior

There is exists an XSS vulnerability where a malicious user could inject
any evil HTML tags or JavaScript into PHProxy's web page. The
vulnerability can be exploited by putting arbitrary code in 'error'
parameter of the PHProxy program.

Example:
http://vulnerable/poxy/index.php?error=html%20code%20could%20be%20easily%20injected%20here

ADDITIONAL INFORMATION

The information has been provided by <mailto:boshcash@msn.com> Boshcash.

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