CVE-2023-22277
📋 TL;DR
A use-after-free vulnerability in Omron CX-Programmer versions 9.79 and earlier allows attackers to cause information disclosure or execute arbitrary code by tricking users into opening a malicious CXP file. This affects all users of vulnerable CX-Programmer software for PLC programming. The vulnerability is distinct from other recent CX-Programmer CVEs.
💻 Affected Systems
- Omron CX-Programmer
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Full system compromise with attacker gaining complete control of the workstation, potentially leading to lateral movement within industrial control networks.
Likely Case
Local privilege escalation or arbitrary code execution on the engineering workstation, potentially compromising PLC programming projects.
If Mitigated
Limited impact due to network segmentation and application whitelisting preventing malicious file execution.
🎯 Exploit Status
Requires user interaction (opening malicious file). No public exploit code available as of analysis.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 9.80 or later
Vendor Advisory: https://www.omron.com/global/en/security/safety/2023/01/omron-20230131-01.html
Restart Required: Yes
Instructions:
1. Download CX-Programmer version 9.80 or later from Omron website. 2. Uninstall previous version. 3. Install updated version. 4. Restart system.
🔧 Temporary Workarounds
Restrict CXP file handling
windowsConfigure Windows to open CXP files with a text editor or block them entirely
assoc .cxp=txtfile
ftype txtfile=%SystemRoot%\system32\NOTEPAD.EXE %1
User awareness training
allTrain engineers to only open CXP files from trusted sources
🧯 If You Can't Patch
- Implement application whitelisting to prevent execution of unauthorized software
- Segment engineering workstations from production networks and implement strict file transfer controls
🔍 How to Verify
Check if Vulnerable:
Check CX-Programmer version via Help > About. If version is 9.79 or earlier, system is vulnerable.Check Version:
Not applicable - check via application GUI Help > About menuVerify Fix Applied:
Verify CX-Programmer version is 9.80 or later via Help > About menu.📡 Detection & Monitoring
Log Indicators:
- Unexpected process crashes of CX-Programmer
- Suspicious file opens of CXP files from unusual locations
Network Indicators:
- Unusual outbound connections from engineering workstations after CXP file opens
SIEM Query:
Process:Name='CX-Programmer.exe' AND EventID=1000 (Application Error)