full-disclosure - phpSysInfo arbitrary file identification

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Date: Wed Jul  5 11:19:53 2006
From: wh1t3h4t3 at yahoo.co.uk (Micheal Turner)
Subject: phpSysInfo arbitrary file identification

Tested 2.5.1

--- Micheal Turner <wh1t3h4t3@...oo.co.uk> wrote:

> phpSysInfo is a popular webscript for displaying
> stats
> about a webserver available from
> http://phpsysinfo.sourceforge.net/ with 365012
> downloads to date. A vulnerability which allows an
> attacker to identify if a file exists on the remote
> system has been identified. By supplying a directory
> traversal string to lng= in a POST or  GET request
> to
> index.php with a poison null byte terminating %00
> allows an attacker to determine if any file exists.
> The vulnerable function is shown.
> 
>  
>   if (!file_exists(APP_ROOT . '/includes/lang/' .
> $lng
> . '.php')) {
>  
> 
> An attacker can determine if the file exists by
> studying the returned error message, valid files
> return the string ?Sorry, we don't support this
> language.? and invalid files return the normal
> phpSysInfo application page. 
> 
> 
> Example.
>
www.somesite.com/phpSysInfo/index.php?template=blue&lng=../../../../../../../../../../../var/log/httpd-error.log%00
> 
> Humour.
>
http://www.google.co.uk/search?hl=en&safe=off&client=firefox-a&rls=org.mozilla%3Aen-GB%3Aofficial&q=%22System+Information%22+phpSysInfo+site%3A.edu&btnG=Search&meta=
> 
> 
> 		
>
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