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Category:   Application (Generic)  >   FreeProxy Vendors:   Hand-Crafted Software
FreeProxy Input Validation Flaw Discloses Files to Remote Users
SecurityTracker Alert ID:  1008661
SecurityTracker URL:  http://securitytracker.com/id/1008661
CVE Reference:   GENERIC-MAP-NOMATCH   (Links to External Site)
Updated:  Jan 13 2004
Original Entry Date:  Jan 9 2004
Impact:   Denial of service via network, Disclosure of system information, Disclosure of user information
Fix Available:  Yes  Vendor Confirmed:  Yes  Exploit Included:  Yes  
Version(s): 3.61
Description:   Some vulnerabilities were reported in FreeProxy in the FreeWeb component. A remote user can view files on the target system. A remote user can cause the application to crash.

badpack3t from SP Research Labs reported that a flaw in the built-in web server component allows a remote user to make an HTTP GET request containing '../' directory traversal characters to view files on the target system. A demonstration exploit request is provided:

GET /../../../../../../../boot.ini%00.html HTTP/1.0

It is also reported that a remote user can make a request for the 'CreateFile' function to cause the application to crash. A demonstration exploit request is provided:

GET CreateFile HTTP/1.0

Only the web server component of FreeProxy is vulnerable. The proxy itself is not affected.

The original advisory is available at:

http://www.security-protocols.com/modules.php?name=News&file=article&sid=1691&mode=&order=0&thold=0

Impact:   A remote user can view files on the target system that are located outside of the web document directory.

A remote user can cause the application to crash.

Solution:   The vendor released a fixed version of FreeProxy V3.61 ("build: Jan 9 2004 at 21:39:21"), available at:

http://www.alphalink.com.au/~gregr/freeproxy.zip
http://www.alphalink.com.au/~gregr/freeproxy.htm

Vendor URL:  www.alphalink.com.au/~gregr/freeproxy.htm (Links to External Site)
Cause:   Exception handling error, Input validation error
Underlying OS:  Windows (NT), Windows (98), Windows (2000), Windows (2003), Windows (XP)

Message History:   None.


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