CVE-2022-45078
📋 TL;DR
This CSV injection vulnerability in the User Blocker WordPress plugin allows authenticated attackers to inject malicious formulas into CSV files. When administrators export user data, these formulas can execute commands in spreadsheet applications like Excel, potentially leading to data theft or system compromise. All WordPress sites running User Blocker version 1.5.5 or earlier are affected.
💻 Affected Systems
- Solwin Infotech User Blocker WordPress Plugin
📦 What is this software?
User Blocker by Solwininfotech
⚠️ Risk & Real-World Impact
Worst Case
An attacker with plugin access could embed formulas that execute arbitrary commands when opened in Excel, potentially leading to complete system compromise, data exfiltration, or ransomware deployment on the administrator's machine.
Likely Case
Attackers inject malicious formulas that execute when administrators open exported CSV files in spreadsheet applications, potentially stealing credentials, installing malware, or manipulating local data.
If Mitigated
With proper input validation and output encoding, CSV files would contain sanitized data without executable formulas, preventing spreadsheet-based attacks.
🎯 Exploit Status
Exploitation requires authenticated access to the WordPress admin panel with User Blocker plugin privileges. CSV injection techniques are well-documented and easy to implement.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 1.5.6 or later
Vendor Advisory: https://patchstack.com/database/vulnerability/user-blocker/wordpress-user-blocker-plugin-1-5-5-auth-csv-injection-vulnerability
Restart Required: No
Instructions:
1. Log into WordPress admin panel. 2. Navigate to Plugins > Installed Plugins. 3. Find 'User Blocker' and click 'Update Now'. 4. Verify version is 1.5.6 or higher. 5. Clear any cached CSV exports.
🔧 Temporary Workarounds
Disable User Blocker Plugin
allTemporarily disable the vulnerable plugin until patching is possible
wp plugin deactivate user-blocker
Restrict Plugin Access
allLimit User Blocker plugin access to trusted administrators only using WordPress roles
🧯 If You Can't Patch
- Disable CSV export functionality in User Blocker plugin settings
- Implement web application firewall rules to block CSV formula injection patterns
🔍 How to Verify
Check if Vulnerable:
Check WordPress admin panel > Plugins > Installed Plugins for User Blocker version. If version is 1.5.5 or earlier, the site is vulnerable.Check Version:
wp plugin get user-blocker --field=versionVerify Fix Applied:
After updating, verify User Blocker version shows 1.5.6 or higher in WordPress plugins list. Test CSV export functionality to ensure formulas are properly sanitized.📡 Detection & Monitoring
Log Indicators:
- Unusual CSV export activity from non-admin users
- Multiple failed CSV export attempts
- Admin users reporting suspicious spreadsheet behavior
Network Indicators:
- CSV file downloads containing formula characters (=, +, -, @) in data fields
- Unusual outbound connections after CSV file access
SIEM Query:
source="wordpress" AND (plugin="user-blocker" AND action="export_csv")