CVE-2023-5846
📋 TL;DR
This vulnerability allows attackers to decode administrator credentials on Franklin Fueling System TS-550 devices, enabling unauthenticated access. Organizations using TS-550 versions prior to 1.9.23.8960 are affected, particularly those in critical infrastructure sectors like fuel distribution.
💻 Affected Systems
- Franklin Fueling System TS-550
📦 What is this software?
Ts 550 Evo Firmware by Franklinfueling
⚠️ Risk & Real-World Impact
Worst Case
Attackers gain full administrative control of fuel management systems, potentially manipulating fuel dispensing, disabling safety controls, or disrupting critical infrastructure operations.
Likely Case
Unauthorized access to device configuration, monitoring data, and potential manipulation of fueling operations or billing systems.
If Mitigated
Limited impact with proper network segmentation and monitoring, though credential exposure remains a significant concern.
🎯 Exploit Status
The vulnerability involves credential decoding rather than complex exploitation, making it relatively easy to weaponize.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 1.9.23.8960
Vendor Advisory: https://www.cisa.gov/news-events/ics-advisories/icsa-23-306-04
Restart Required: Yes
Instructions:
1. Contact Franklin Fueling Systems for firmware update 1.9.23.8960. 2. Backup device configuration. 3. Apply firmware update following vendor instructions. 4. Restart device. 5. Verify successful update and functionality.
🔧 Temporary Workarounds
Network Segmentation
allIsolate TS-550 devices from untrusted networks and internet access
Access Control Lists
allImplement strict firewall rules limiting access to TS-550 management interfaces
🧯 If You Can't Patch
- Implement strict network segmentation to isolate TS-550 devices from untrusted networks
- Monitor network traffic to TS-550 devices for unauthorized access attempts and credential decoding activities
🔍 How to Verify
Check if Vulnerable:
Check device firmware version via web interface or serial console. If version is below 1.9.23.8960, device is vulnerable.Check Version:
Check via web interface at http://[device-ip]/status or via serial console connectionVerify Fix Applied:
Verify firmware version shows 1.9.23.8960 or higher in device management interface.📡 Detection & Monitoring
Log Indicators:
- Multiple failed login attempts followed by successful admin access
- Unusual admin login times or locations
- Configuration changes from unexpected sources
Network Indicators:
- HTTP requests to TS-550 management interface from unexpected IPs
- Traffic patterns suggesting credential decoding attempts
- Unauthorized access to admin endpoints
SIEM Query:
source_ip=* AND dest_ip=[TS-550_IP] AND (http_method=POST AND uri CONTAINS "/login" OR uri CONTAINS "/admin")