[UNIX] PhpDig Remote Command Execution

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To: list@securiteam.com
Date: 15 Jan 2004 19:22:53 +0200

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  PhpDig Remote Command Execution
------------------------------------------------------------------------

SUMMARY

 <http://www.phpdig.net/> PhpDig is "an HTTP spider/search engine written
in PHP with a mySQL database in backend. PhpDig builds a glossary with the
keywords found in indexed pages. On a search query, it displays a result
page with documents which contain the search keys, ranked by occurrence".
A vulnerability in PhpDig allows remote attackers to include an external
PHP file that will be later executed.

DETAILS

Vulnerable Systems:
 * PhpDig version 1.6.x and prior

Due to a vulnerability in the product a remote attacker can inject a URL
in $relative_script_path and obtain command execution with the web
server's privileges (usually nobody).

From the file ./include/config.php:
//includes language file
if
(is_file("$relative_script_path/locales/$phpdig_language-language.php"))
    {include
"$relative_script_path/locales/$phpdig_language-language.php";}
else
    {include "$relative_script_path/locales/en-language.php";}

//includes of libraries
include "$relative_script_path/libs/phpdig_functions.php";
include "$relative_script_path/libs/function_phpdig_form.php";
include "$relative_script_path/libs/mysql_functions.php";

Workarounds:
Several workarounds can be used:

 * Patching .htaccess in ./includes
 * Turning PHP globals off (Default in PHP > 4.2).
 * An unofficial patch for config.php which can be found at
<http://www.kernelpanik.org/code/kernelpanik/phpdig.zip>
http://www.kernelpanik.org/code/kernelpanik/phpdig.zip

ADDITIONAL INFORMATION

The information has been provided by <mailto:frame@kernelpanik.org> FraMe

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