CVE-2022-27648
📋 TL;DR
CVE-2022-27648 is a stack-based buffer overflow vulnerability in KOYO Screen Creator 0.1.1.1 that allows remote attackers to execute arbitrary code when a user opens a malicious SCA2 file or visits a malicious webpage. This affects users of KOYO Screen Creator software for industrial HMI development.
💻 Affected Systems
- KOYO Screen Creator
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise with attacker gaining full control of the affected system, potentially leading to industrial control system manipulation or data exfiltration.
Likely Case
Remote code execution in the context of the current user, allowing installation of malware, data theft, or lateral movement within the network.
If Mitigated
Limited impact if proper network segmentation and application whitelisting prevent malicious file execution.
🎯 Exploit Status
ZDI-CAN-14868 indicates professional vulnerability research. Exploitation requires user interaction but no special privileges.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Update to latest version from vendor
Vendor Advisory: https://www.koyoele.co.jp/en/topics/202203154994/
Restart Required: Yes
Instructions:
1. Download latest version from KOYO Electric website. 2. Uninstall current version. 3. Install updated version. 4. Restart system.
🔧 Temporary Workarounds
Restrict SCA2 file execution
windowsBlock execution of SCA2 files via application control policies
Use Windows AppLocker or similar to block *.sca2 files
Network segmentation
allIsolate KOYO Screen Creator systems from untrusted networks
🧯 If You Can't Patch
- Implement strict application whitelisting to prevent unauthorized program execution
- Educate users to never open SCA2 files from untrusted sources and disable automatic file opening
🔍 How to Verify
Check if Vulnerable:
Check installed version of KOYO Screen Creator. If version is 0.1.1.1, system is vulnerable.Check Version:
Check program properties or About dialog in KOYO Screen Creator applicationVerify Fix Applied:
Verify KOYO Screen Creator version is updated beyond 0.1.1.1 and test with known safe SCA2 files.📡 Detection & Monitoring
Log Indicators:
- Unexpected process crashes of KOYO Screen Creator
- Execution of suspicious child processes from KOYO Screen Creator
Network Indicators:
- Unexpected outbound connections from KOYO Screen Creator process
SIEM Query:
Process Creation where ParentImage contains 'Screen Creator' AND (CommandLine contains '.sca2' OR Image contains suspicious patterns)