CVE-2024-46892
📋 TL;DR
This vulnerability allows authenticated attackers to maintain active sessions even after their user accounts have been disabled or deleted in SINEC INS. Attackers could continue performing malicious actions with their old permissions. All SINEC INS users with versions before V1.0 SP2 Update 3 are affected.
💻 Affected Systems
- SINEC INS
📦 What is this software?
Sinec Ins by Siemens
Sinec Ins by Siemens
Sinec Ins by Siemens
Sinec Ins by Siemens
Sinec Ins by Siemens
Sinec Ins by Siemens
⚠️ Risk & Real-World Impact
Worst Case
A malicious insider or compromised account could maintain persistent access to critical industrial control systems even after being detected and disabled, potentially causing operational disruption or data exfiltration.
Likely Case
Former employees or contractors with disabled accounts could maintain unauthorized access to SINEC INS systems, potentially accessing sensitive industrial network data or configurations.
If Mitigated
With proper session management controls and monitoring, the impact is limited to temporary persistence until sessions naturally expire.
🎯 Exploit Status
Exploitation requires an authenticated session and knowledge that the account will be disabled. Attackers could intentionally trigger this by getting their account disabled while maintaining active sessions.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: V1.0 SP2 Update 3
Vendor Advisory: https://cert-portal.siemens.com/productcert/html/ssa-915275.html
Restart Required: Yes
Instructions:
1. Download V1.0 SP2 Update 3 from Siemens support portal. 2. Backup current configuration. 3. Apply the update following Siemens installation guide. 4. Restart the SINEC INS application/service. 5. Verify all sessions are properly invalidated after user changes.
🔧 Temporary Workarounds
Manual Session Termination
allManually terminate all active sessions after disabling or modifying user accounts
Not applicable - requires administrative action in SINEC INS interface
Reduce Session Timeout
allConfigure shorter session timeout values to limit persistence window
Configure in SINEC INS administration interface under session settings
🧯 If You Can't Patch
- Implement strict monitoring of user account changes and immediately force-logout all sessions for disabled/modified users
- Deploy network segmentation to limit SINEC INS access to only necessary personnel and systems
🔍 How to Verify
Check if Vulnerable:
Check SINEC INS version in administration interface. If version is earlier than V1.0 SP2 Update 3, system is vulnerable.Check Version:
Check version in SINEC INS web interface under System Information or Administration panelVerify Fix Applied:
After patching: 1. Create test user. 2. Login with test user. 3. Disable test user account. 4. Verify test user session is immediately terminated and cannot perform actions.📡 Detection & Monitoring
Log Indicators:
- User account disabled/modified but same user continues to generate activity logs
- Session persistence after user status changes
- Failed logout events for disabled users
Network Indicators:
- Continued network traffic from disabled user accounts
- Authentication attempts from sessions that should be invalid
SIEM Query:
source="sinec_ins" AND (user_status="disabled" OR user_status="modified") AND user_activity="active"