Donato Ferrante


Application:  MyProxy
              http://www.dietrich.cx/devel/myproxy/

Version:      20030629

Bug:          cross site scripting

Author:       Donato Ferrante
              e-mail: fdonato@autistici.org
              web:    www.autistici.org/fdonato


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1. Description
2. The bug
3. The code
4. The fix



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1. Description:
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Vendor's Description:

"MyProxy is a privacy-enhancing personal HTTP 1.1 proxy.
Arbitrary URLs can be blocked by regular expression patterns and
optionally replaced by transparent GIFs. 
Cookies can be controlled based on server/domain name.
The "Referer", "User-Agent", and "From" HTTP headers can be dealt
with in various ways. All user settings are configured through an
HTML user interface."



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2. The bug:
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The input strings are not filtered by the proxy server so they will
appear in the returned page.



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3. The code:
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To test the vulnerability:

http://[host]:8080/<script>alert("Test")</script>



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4. The fix:
------------

Vendor was contacted.
Bug will be fixed in the next version.



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