CVE-2023-39231
📋 TL;DR
This vulnerability in PingFederate with PingOne MFA adapter allows attackers who have compromised a user's first-factor credentials (like username/password) to register their own MFA device without needing to authenticate with the victim's existing MFA device. This affects organizations using PingFederate with PingOne MFA adapter for multi-factor authentication.
💻 Affected Systems
- PingFederate with PingOne MFA adapter
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete account takeover where attacker gains persistent access to victim's account by registering their own MFA device, bypassing all MFA protections.
Likely Case
Targeted attacks against high-value accounts where attackers have already obtained first-factor credentials through phishing or credential stuffing.
If Mitigated
Limited impact if strong first-factor authentication controls exist and MFA device registration is monitored.
🎯 Exploit Status
Requires first-factor credentials but then simple MFA device registration process
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Not specified in provided references
Vendor Advisory: https://docs.pingidentity.com/r/en-us/pingfederate-pingone-mfa-ik/bks1657303194394
Restart Required: Yes
Instructions:
1. Review PingIdentity advisory 2. Apply recommended patch/update 3. Restart PingFederate services 4. Verify MFA device registration now requires existing device authentication
🔧 Temporary Workarounds
Require existing MFA device authentication
allConfigure PingFederate to require authentication from existing registered MFA device before allowing new device pairing
Enable MFA device registration alerts
allConfigure logging and alerts for all MFA device registration events
🧯 If You Can't Patch
- Implement additional authentication step for MFA device registration
- Monitor and audit all MFA device registration events for suspicious activity
🔍 How to Verify
Check if Vulnerable:
Test if new MFA device can be registered without authenticating with existing registered device using test credentialsCheck Version:
Check PingFederate version via admin console or pingfederate -v commandVerify Fix Applied:
Verify that new MFA device registration now requires authentication from existing registered device📡 Detection & Monitoring
Log Indicators:
- MFA device registration events without corresponding existing device authentication
- Multiple MFA device registrations for single user in short timeframe
Network Indicators:
- Authentication requests followed immediately by MFA device registration
SIEM Query:
source="pingfederate" AND (event="mfa_device_registered" AND NOT preceding_event="mfa_device_authenticated")