CVE-2016-10971
📋 TL;DR
The MemberSonic Lite WordPress plugin before version 1.302 has an authentication bypass vulnerability that allows unauthenticated attackers to log in as any user by knowing only their email address. This affects all WordPress sites running vulnerable versions of the MemberSonic Lite plugin, potentially compromising user accounts and site administration.
💻 Affected Systems
- MemberSonic Lite WordPress Plugin
📦 What is this software?
Membersonic by Membersonic
⚠️ Risk & Real-World Impact
Worst Case
Complete site takeover where attackers gain administrative access, install backdoors, steal sensitive data, deface the site, or use it for further attacks.
Likely Case
Attackers compromise user accounts to steal personal information, post malicious content, or escalate privileges to gain administrative control.
If Mitigated
Limited impact with proper network segmentation, strong monitoring, and immediate patching, though authentication bypass remains a critical risk.
🎯 Exploit Status
Exploitation requires only knowledge of a valid email address and can be performed via simple HTTP requests.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 1.302
Vendor Advisory: http://www.pritect.net/blog/membersonic-lite-1-2-unauthenticated-login
Restart Required: No
Instructions:
1. Log into WordPress admin panel. 2. Navigate to Plugins > Installed Plugins. 3. Find MemberSonic Lite and update to version 1.302 or later. 4. If update not available, deactivate and remove the plugin immediately.
🔧 Temporary Workarounds
Disable MemberSonic Lite Plugin
allTemporarily deactivate the vulnerable plugin until patched.
wp plugin deactivate membersonic-lite
Restrict Access to WordPress Admin
linuxLimit access to WordPress admin interface using firewall rules or IP whitelisting.
iptables -A INPUT -p tcp --dport 80 -s TRUSTED_IP -j ACCEPT
iptables -A INPUT -p tcp --dport 443 -s TRUSTED_IP -j ACCEPT
🧯 If You Can't Patch
- Deactivate and remove the MemberSonic Lite plugin immediately.
- Implement web application firewall (WAF) rules to block authentication bypass attempts.
🔍 How to Verify
Check if Vulnerable:
Check WordPress admin panel > Plugins > Installed Plugins for MemberSonic Lite version. If version is below 1.302, the system is vulnerable.Check Version:
wp plugin list --name=membersonic-lite --field=versionVerify Fix Applied:
Confirm MemberSonic Lite plugin is updated to version 1.302 or later, or verify the plugin is deactivated/removed.📡 Detection & Monitoring
Log Indicators:
- Unusual login attempts using email addresses only
- Multiple failed login attempts followed by successful login from same IP
- User agent anomalies in authentication requests
Network Indicators:
- HTTP POST requests to /wp-admin/admin-ajax.php with action=membersonic_login
- Unusual traffic patterns to WordPress login endpoints
SIEM Query:
source="wordpress.log" AND (uri_path="/wp-admin/admin-ajax.php" AND post_data="action=membersonic_login")