CVE-2020-23050
📋 TL;DR
TAO Open Source Assessment Platform v3.3.0 RC02 contains an HTML injection vulnerability in the userFirstName parameter that allows attackers to inject malicious HTML/JavaScript. This enables phishing attacks, external redirects, and arbitrary code execution against users who view the compromised user account fields. All systems running this specific version are affected.
💻 Affected Systems
- TAO Open Source Assessment Platform
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Attackers could execute arbitrary JavaScript in victims' browsers, leading to session hijacking, credential theft, malware installation, or complete account compromise through sophisticated phishing campaigns.
Likely Case
Attackers will likely use this for phishing attacks by injecting malicious forms or redirects to steal credentials, or for defacement by injecting visible HTML content.
If Mitigated
With proper input validation and output encoding, the injected content would be displayed as plain text rather than executed, preventing all attack scenarios.
🎯 Exploit Status
Exploitation requires access to modify user account fields, but HTML injection is straightforward once access is obtained.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: v3.3.0 stable or later
Vendor Advisory: https://www.taotesting.com/
Restart Required: No
Instructions:
1. Upgrade to TAO v3.3.0 stable or later version. 2. Apply proper input validation and output encoding for all user-controlled fields. 3. Test the fix by attempting HTML injection in userFirstName field.
🔧 Temporary Workarounds
Input Validation Filter
allImplement server-side input validation to strip or escape HTML tags from userFirstName parameter
Implement regex filter: /[<][^>]*[>]/g to remove HTML tags
Output Encoding
allApply HTML entity encoding to all user-controlled output before rendering
Use htmlspecialchars() or equivalent function in your programming language
🧯 If You Can't Patch
- Implement WAF rules to block HTML/JavaScript in userFirstName parameter
- Disable user account modification functionality or restrict to trusted administrators only
🔍 How to Verify
Check if Vulnerable:
Test by entering HTML code like <script>alert('test')</script> in the userFirstName field and check if it executes when displayedCheck Version:
Check TAO version in admin panel or configuration filesVerify Fix Applied:
After patching, attempt the same HTML injection test and verify the content displays as plain text rather than executing📡 Detection & Monitoring
Log Indicators:
- Unusual HTML/JavaScript patterns in user account modification logs
- Multiple failed injection attempts in userFirstName field
Network Indicators:
- External script loads from user profile pages
- Unexpected redirects from user account views
SIEM Query:
search 'userFirstName' AND ('<script>' OR 'javascript:' OR 'onload=') in web application logs