CVE-2023-27916
📋 TL;DR
This vulnerability allows attackers to execute arbitrary code by exploiting improper validation in font file parsing. It affects applications that process FNT font files without proper bounds checking, potentially compromising systems running vulnerable software.
💻 Affected Systems
- Specific product information not provided in CVE description
📦 What is this software?
Cscape by Hornerautomation
Cscape Envisionrv by Hornerautomation
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete system compromise, data theft, or ransomware deployment.
Likely Case
Application crash (denial of service) or limited information disclosure via out-of-bounds read.
If Mitigated
Application crash with no data compromise if memory protections are enabled.
🎯 Exploit Status
Requires attacker to supply malicious font file; exploitation depends on memory layout and protections.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check vendor-specific updates
Vendor Advisory: https://www.cisa.gov/news-events/ics-advisories/icsa-23-143-04
Restart Required: Yes
Instructions:
1. Identify affected software using vendor advisories
2. Apply vendor-provided patches
3. Restart affected services/applications
4. Verify patch installation
🔧 Temporary Workarounds
Disable font file processing
allPrevent application from parsing external font files if not required
Configuration specific - consult application documentation
Input validation
allImplement strict validation of font files before processing
Application-specific implementation required
🧯 If You Can't Patch
- Network segmentation to isolate vulnerable systems
- Implement application allowlisting to prevent unauthorized execution
🔍 How to Verify
Check if Vulnerable:
Check application version against vendor advisories; test with controlled font file parsingCheck Version:
Application-specific - consult vendor documentationVerify Fix Applied:
Verify patch version installed; test font file parsing functionality📡 Detection & Monitoring
Log Indicators:
- Application crashes during font processing
- Unusual font file uploads
- Memory access violation errors
Network Indicators:
- Unexpected font file transfers to vulnerable systems
SIEM Query:
source="application_logs" AND (event="crash" OR event="memory_violation") AND process="*font*"