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| | acFreeProxy Server Input Validation Flaw Allows Remote Users to Conduct Cross-Site Scripting Attacks Against Proxy Server Users |
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Categorie: Vulnerability
Posted: 2002-11-27 by ReCall
Views: 345
Source: Click here
| Current Rating: Not rated
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| | Details |
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Description: An input validation vulnerability was reported in the acFreeProxy (acFP) HTTP proxy server. A remote user can conduct cross-site scripting attacks against users of the proxy server, potentially targeted against any web site.
It is reported that the proxy server does not filter HTML code from user-supplied URLs when printing the URL in an error message. An error message may be generated if the specified host is not reachable or if some other error condition exists.
A remote user can create a specially crafted URL that, when loaded by a target user, will cause arbitrary scripting code to be executed by the target user's browser. The code will originate from the site specified in the URL. Because the flaw is in the proxy server (and not in any particular destination site), this can be any site. As a result, the code will be able to access the target user's cookies (including authentication cookies), if any, associated with the site, access data recently submitted by the target user via web form to the site, or take actions on the site acting as the target user.
A demonstration exploit URL is provided:
http://www.hotmail.com:41997/%3CSCRIPT%3Ealert%28 document%3EURL%29%3C/SCRIPT%3E/
If the target user is configured to use the acFP proxy server, the above listed demonstration exploit URL will cause Javascript to be executed on the target user's browser.
Impact: A remote user can access the target user's cookies (including authentication cookies), if any,
associated with any web site (that the user would access via the proxy server), access data recently submitted by the target user via web form to the site, or take actions on the site acting as the target user.
Solution: No solution was available at the time of this entry.
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