[UNIX] CuteNews Code Execution (ip2long)

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To: list@securiteam.com
Date: 27 Sep 2005 15:44:38 +0200

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  CuteNews Code Execution (ip2long)
------------------------------------------------------------------------

SUMMARY

" <http://cutephp.com/> Cute news is a powerful and easy for using news
management system that use flat files to store its database. It supports
comments, archives, search function, image uploading, backup function, IP
banning, flood protection and more..."

Lack of proper parameter filtering and validation allows attackers to
execute arbitrary code in CuteNews.

DETAILS

Vulnerable Systems:
 * CuteNews version 1.4.0

CuteNews uses the environment variable HTTP_CLIENT_IP and the PHP function
ip2long. The function ip2long always return true regardless of the content
that should be an IP address. CuteNews does not validate that the IP
address is valid and only care for the result of the ip2long function.

Vulnerable Code:
..
    //----------------------------------
    // Get the IP
    //----------------------------------
        $foundip = TRUE;
   [!] if (getenv("HTTP_CLIENT_IP")) $ip = getenv("HTTP_CLIENT_IP");
                                                [!]
        else if(getenv("REMOTE_ADDR")) $ip = getenv("REMOTE_ADDR");
        else if(getenv("HTTP_X_FORWARDED_FOR")) $ip =
getenv("HTTP_X_FORWARDED_FOR");
        else {$ip = "not detected"; $foundip = FALSE;}
   [!] if( $foundip and !ip2long($ip) ){ $ip = "not detected"; $foundip =
FALSE;} //ensure that what we have is a real IP [!]
..

By crafting a special IP address in the HTTP request it is possible to
inject arbitrary code and cause CuteNews to execute it.

ADDITIONAL INFORMATION

The information has been provided by <mailto:retrogod@aliceposta.it>
rgod.
The exploit can be found at:
<http://www.securiteam.com/exploits/5KP0D2KGUI.html>
http://www.securiteam.com/exploits/5KP0D2KGUI.html

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