CVE-2024-12562
📋 TL;DR
The s2Member Pro WordPress plugin is vulnerable to PHP object injection via deserialization of untrusted input in the 's2member_pro_remote_op' parameter. This allows unauthenticated attackers to inject malicious PHP objects, potentially leading to remote code execution if a suitable POP chain exists through other installed plugins or themes. All WordPress sites using s2Member Pro versions up to 241216 are affected.
💻 Affected Systems
- s2Member Pro WordPress Plugin
📦 What is this software?
S2member by S2member
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete system compromise, data theft, or website defacement if a suitable POP chain exists via other installed components.
Likely Case
Denial of service, limited data exposure, or file manipulation depending on available POP chains in the specific WordPress installation.
If Mitigated
Limited impact due to lack of suitable POP chains, potentially only causing application errors or crashes.
🎯 Exploit Status
No known POP chain in s2Member Pro itself, but exploitation possible if suitable chain exists in other installed components. Unauthenticated exploitation confirmed.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Versions after 241216
Vendor Advisory: https://s2member.com/changelog/
Restart Required: No
Instructions:
1. Log into WordPress admin panel. 2. Navigate to Plugins → Installed Plugins. 3. Find s2Member Pro and click 'Update Now'. 4. Verify update to version after 241216.
🔧 Temporary Workarounds
Disable s2Member Pro Plugin
allTemporarily disable the vulnerable plugin until patched
wp plugin deactivate s2member-pro
Web Application Firewall Rule
allBlock requests containing the vulnerable parameter
Add WAF rule to block requests with 's2member_pro_remote_op' parameter
🧯 If You Can't Patch
- Implement strict WAF rules to block requests containing 's2member_pro_remote_op' parameter
- Remove or disable s2Member Pro plugin and use alternative membership solutions
🔍 How to Verify
Check if Vulnerable:
Check WordPress admin → Plugins → Installed Plugins for s2Member Pro version 241216 or earlierCheck Version:
wp plugin list --name=s2member-pro --field=versionVerify Fix Applied:
Verify s2Member Pro version is later than 241216 in WordPress admin panel📡 Detection & Monitoring
Log Indicators:
- HTTP requests containing 's2member_pro_remote_op' parameter with serialized data
- PHP errors related to unserialize() or object injection
Network Indicators:
- POST requests to WordPress endpoints with serialized PHP objects in parameters
SIEM Query:
web.url:*s2member_pro_remote_op* AND (web.post_data:*O:* OR web.post_data:*a:* OR web.post_data:*s:* OR web.post_data:*i:*)