CVE-2023-52200
📋 TL;DR
This vulnerability in the ARMember WordPress plugin allows attackers to perform Cross-Site Request Forgery (CSRF) attacks that lead to PHP object injection via deserialization of untrusted data. Attackers can execute arbitrary code on affected WordPress sites, potentially compromising the entire website. All WordPress sites using vulnerable versions of the ARMember plugin are affected.
💻 Affected Systems
- ARMember - Membership Plugin, Content Restriction, Member Levels, User Profile & User signup
📦 What is this software?
Armember by Reputeinfosystems
⚠️ Risk & Real-World Impact
Worst Case
Complete website takeover, data theft, malware installation, and server compromise leading to lateral movement within the hosting environment.
Likely Case
Website defacement, credential theft, backdoor installation, and unauthorized access to member data and administrative functions.
If Mitigated
Limited impact with proper CSRF protections and input validation in place, though the vulnerability still presents significant risk.
🎯 Exploit Status
Exploitation requires tricking an authenticated user (including administrators) to visit a malicious page. The CSRF vulnerability enables the PHP object injection attack.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 4.0.23 and later
Restart Required: No
Instructions:
1. Log into WordPress admin panel. 2. Navigate to Plugins > Installed Plugins. 3. Find ARMember plugin. 4. Click 'Update Now' if update is available. 5. If no update appears, manually download version 4.0.23+ from WordPress.org and replace the plugin files.
🔧 Temporary Workarounds
Disable ARMember Plugin
allTemporarily disable the vulnerable plugin until patching is possible
wp plugin deactivate armember-membership
Implement CSRF Protection
allAdd WordPress nonce verification to all plugin forms and AJAX requests
🧯 If You Can't Patch
- Implement Web Application Firewall (WAF) rules to block CSRF attacks and suspicious deserialization attempts
- Restrict plugin access to trusted IP addresses only using .htaccess or web server configuration
🔍 How to Verify
Check if Vulnerable:
Check WordPress admin panel > Plugins > ARMember version. If version is 4.0.22 or lower, the site is vulnerable.Check Version:
wp plugin get armember-membership --field=versionVerify Fix Applied:
Verify ARMember plugin version is 4.0.23 or higher in WordPress admin panel.📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to ARMember plugin endpoints
- CSRF token validation failures
- PHP deserialization errors in web server logs
Network Indicators:
- Multiple failed CSRF attempts from same source
- Suspicious referer headers in requests to ARMember endpoints
SIEM Query:
source="web_server.log" AND ("armember" OR "wp-admin/admin-ajax.php") AND ("action=arm_" OR "deserialize" OR "unserialize")🔗 References
- https://patchstack.com/database/vulnerability/armember-membership/wordpress-armember-lite-plugin-4-0-22-cross-site-request-forgery-csrf-to-php-object-injection-vulnerability?_s_id=cve
- https://patchstack.com/database/vulnerability/armember-membership/wordpress-armember-lite-plugin-4-0-22-cross-site-request-forgery-csrf-to-php-object-injection-vulnerability?_s_id=cve
