CVE-2018-9031
📋 TL;DR
CVE-2018-9031 is a critical authentication bypass vulnerability in TNLSoftSolutions Sentry Vision 3.x devices where passwords are exposed in HTML source code, enabling client-side authentication bypass. Attackers can gain unauthorized access to the device's administrative interface. This affects all organizations using vulnerable Sentry Vision 3.x devices.
💻 Affected Systems
- TNLSoftSolutions Sentry Vision
📦 What is this software?
Sentry Vision by Tnlsoftsolutions
Sentry Vision by Tnlsoftsolutions
Sentry Vision by Tnlsoftsolutions
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of the surveillance system allowing attackers to disable monitoring, manipulate footage, access sensitive video feeds, and pivot to internal networks.
Likely Case
Unauthorized access to surveillance system leading to privacy violations, footage manipulation, and potential physical security bypass.
If Mitigated
Limited impact if device is isolated in a secure network segment with strict access controls and monitoring.
🎯 Exploit Status
Exploitation requires only viewing page source and extracting credentials. Multiple public proof-of-concept scripts and videos demonstrate the attack.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: Not available
Restart Required: No
Instructions:
No official patch available. Contact TNLSoftSolutions for updated firmware or consider replacing vulnerable devices.
🔧 Temporary Workarounds
Network Segmentation
allIsolate Sentry Vision devices in a separate VLAN with strict firewall rules preventing external access.
Reverse Proxy with Authentication
allPlace device behind a reverse proxy that enforces proper authentication before forwarding requests.
🧯 If You Can't Patch
- Remove devices from internet-facing networks immediately
- Implement strict network access controls allowing only authorized IP addresses to connect
🔍 How to Verify
Check if Vulnerable:
Access the login page, view page source, and search for 'if(pwd ==' to see if password is exposed in HTML.Check Version:
Check device web interface or documentation for firmware version information.Verify Fix Applied:
Check that password is no longer visible in HTML source and proper server-side authentication is enforced.📡 Detection & Monitoring
Log Indicators:
- Multiple failed login attempts followed by successful access without proper credentials
- Access from unusual IP addresses to administrative interface
Network Indicators:
- HTTP requests to login page with unusual user agents or patterns
- Traffic to device from external/unexpected sources
SIEM Query:
source_ip=external AND destination_port=80 AND uri_path CONTAINS '/login' AND status_code=200🔗 References
- https://gist.github.com/pabloonicarres/c2c284ca7b025d629da39087445ed15d#file-sentryvision_authentication_bypass-sh
- https://www.youtube.com/watch?v=pLMH9vGPRCo
- https://gist.github.com/pabloonicarres/c2c284ca7b025d629da39087445ed15d#file-sentryvision_authentication_bypass-sh
- https://www.youtube.com/watch?v=pLMH9vGPRCo
