Command Injection in cool-video-gallery v1.9 Wordpress plugin

[Larry Cashdollar <larry0 () me com>]

Title: Command Injection in cool-video-gallery v1.9 Wordpress plugin
Author: Larry W. Cashdollar, @_larry0
Date: 2015-11-29
Download Site: https://wordpress.org/plugins/cool-video-gallery/
Vendor: https://profiles.wordpress.org/praveen-rajan/
Vendor Notified: 2015-11-30
Vendor Contact: 
https://wordpress.org/support/topic/command-injection-vulnerability-in-v19?
replies=1#post-7721994
Description: Cool Video Gallery is a Video Gallery plugin for WordPress
with option to upload videos, attach media files, add Youtube videos and
manage them in multiple galleries. Automatic preview image generation for
uploaded videos using FFMPEG library available. Option provided to upload
images for video previews. Supports '.flv', '.mp4', '.mov', '.m4v' and
'.mp3' video files presently.
Vulnerability:
If any of the arguments being passed to $command are sourced from user
input, we can inject commands to be passed to the shell via exec() on line
714.

In cool-video-gallery/lib/core.php lines 703-714:

 703                 $gallery = videoDB::find_gallery($video->galleryid);
 704                 $video_input = $gallery->abspath . '/' .
$video->filename;
 705                 $new_target_filename = $video->alttext . '.png';
 706                 $new_target_file = $gallery->abspath .
'/thumbs/thumbs_' . $new_target_filename;
 707 
 708                 if($video->video_type ==
$cool_video_gallery->video_type_media){
 709                         $command = $options['cvg_ffmpegpath'] . " -i
'$video->filename' -vcodec mjpeg -vframes 1 -an -f rawvideo -ss 5      -s
".$thumb_width ."x".$thumb_height." '$new_target_file'";
 710                 }else {
 711                         $command = $options['cvg_ffmpegpath'] . " -i
'$video_input' -vcodec mjpeg -vframes 1 -an -f rawvideo -ss 5 -s "
.$thumb_width ."x".$thumb_height." '$new_target_file'";
 712                 }
 713 
 714                 exec ( $command );
CVEID: 2015-7527
Exploit Code:
Screen shots are located at below URL.
Advisory: http://www.vapidlabs.com/advisory.php?v=158