Siemens JT Utilities
Monitor5.5ICS-CERT ICSA-21-194-09Jul 13, 2021
Attack VectorLocal
Auth RequiredNone
ComplexityLow
User InteractionRequired
Summary
Siemens JT Utilities versions prior to 13.0.2.0 contain improper input handling and null pointer dereference vulnerabilities (CWE-688, CWE-476) that can be triggered when opening specially crafted JT files. The vulnerabilities cause the application to crash or become unresponsive. These vulnerabilities are not remotely exploitable and require user interaction to open a malicious file.
What this means
What could happen
An attacker who tricks an operator into opening a malicious JT file could cause the JT Utilities application to crash or become unresponsive, disrupting the operator's ability to view or work with engineering design files. This could delay troubleshooting or process modifications at your facility.
Who's at risk
Engineering and maintenance staff at any facility using Siemens JT Utilities for design file viewing and management. This affects anyone who receives or handles JT files as part of plant engineering work, including facilities that use JT files for equipment design, process documentation, or CAD interchange.
How it could be exploited
An attacker sends a crafted JT file (via email, USB, or file share) to an operator. When the operator opens the file in JT Utilities, the malicious file content triggers a null pointer dereference or improper input handling, causing the application to crash. The attacker relies on social engineering to convince the operator to open the untrusted file.
Prerequisites
- User must open a malicious JT file in JT Utilities
- File must be delivered to the operator (no remote delivery mechanism in the vulnerability itself)
- User interaction required - operator must consciously open the file
User interaction required to exploitAttacker must use social engineering to deliver fileLow attack complexityApplication-level denial of service only (not safety-critical unless JT Utilities is part of safety system workflow)Patch available from vendor
Exploitability
Low exploit probability (EPSS 0.1%)
Affected products (1)
ProductAffected VersionsFix Status
JT Utilities<V13.0.2.013.0.2.0
Remediation & Mitigation
0/3
Do now
0/1WORKAROUNDEstablish a policy to avoid opening JT files from untrusted or unknown sources; implement user training to recognize and reject suspicious file delivery
Schedule — requires maintenance window
0/1Patching may require device reboot — plan for process interruption
HOTFIXUpdate JT Utilities to version 13.0.2.0 or later
Long-term hardening
0/1HARDENINGSegment engineering workstation networks from operational networks and implement network-level file transfer controls
↑↓ Navigate · Esc Close
API:
/api/v1/advisories/9331e650-ed98-4272-aa4c-f1c084e81ca2