CVE-2025-25450
📋 TL;DR
This vulnerability allows remote attackers to bypass two-factor authentication (2FA) in MyTaag software by deactivating the second factor via the /session endpoint. Attackers can escalate privileges to gain unauthorized access to accounts. All users of MyTaag v.2024-11-24 and earlier versions are affected.
💻 Affected Systems
- TAAGSOLUTIONS GmbH MyTaag
📦 What is this software?
Mytaag by Mytaag
⚠️ Risk & Real-World Impact
Worst Case
Complete account takeover with administrative privileges, leading to data theft, unauthorized system access, and potential lateral movement within the network.
Likely Case
Unauthorized access to user accounts with standard privileges, enabling data exfiltration, privilege escalation, and session hijacking.
If Mitigated
Limited impact if strong network segmentation, monitoring, and additional authentication layers are in place, though 2FA bypass remains possible.
🎯 Exploit Status
Exploitation requires network access to the /session endpoint but is straightforward once identified. The referenced blog provides technical details.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: Not publicly available
Restart Required: No
Instructions:
1. Contact TAAGSOLUTIONS GmbH for patch information. 2. Apply any available updates immediately. 3. Verify the fix by testing 2FA functionality.
🔧 Temporary Workarounds
Restrict Access to /session Endpoint
linuxBlock or limit network access to the vulnerable /session endpoint using firewall rules or web application firewalls.
iptables -A INPUT -p tcp --dport [PORT] -m string --string "/session" --algo bm -j DROP
Disable 2FA Temporarily
allDisable two-factor authentication in MyTaag configuration to remove the attack vector, though this reduces security.
🧯 If You Can't Patch
- Implement network segmentation to isolate MyTaag instances from untrusted networks.
- Enhance monitoring for unusual session activity or 2FA deactivation attempts.
🔍 How to Verify
Check if Vulnerable:
Test if sending a crafted request to the /session endpoint can deactivate 2FA without proper authorization. Review application logs for 2FA bypass attempts.Check Version:
Check MyTaag version in admin panel or configuration files. Command varies by deployment.Verify Fix Applied:
Verify that 2FA cannot be deactivated via unauthorized requests to /session. Test with valid and invalid authentication tokens.📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to /session endpoint
- 2FA deactivation events without user consent
- Failed authentication followed by successful session creation
Network Indicators:
- HTTP traffic to /session with suspicious parameters
- Rapid session creation attempts
SIEM Query:
source="mytaag.log" AND (uri_path="/session" AND http_method="POST") | stats count by src_ip