CVE-2023-39125
📋 TL;DR
CVE-2023-39125 is an integer overflow and out-of-bounds write vulnerability in NTSC-CRT's BMP loading function. Attackers can exploit this by providing specially crafted BMP files to potentially execute arbitrary code or crash the application. This affects users of NTSC-CRT 2.2.1 who process untrusted BMP files.
💻 Affected Systems
- NTSC-CRT
📦 What is this software?
Ntsc Crt by Ntsc Crt Project
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete system compromise if the application runs with elevated privileges.
Likely Case
Application crash (denial of service) or limited memory corruption leading to unstable behavior.
If Mitigated
Application crash with no privilege escalation if running with minimal privileges in isolated environment.
🎯 Exploit Status
Exploitation requires crafting a malicious BMP file; no authentication needed to trigger the vulnerability when processing files.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: None
Vendor Advisory: https://github.com/LMP88959/NTSC-CRT/issues/32
Restart Required: No
Instructions:
No official patch available. Vendor considers this a demonstration program not intended for production use.
🔧 Temporary Workarounds
Input validation wrapper
allImplement custom validation for BMP file dimensions before passing to loadBMP function
// Custom code required - validate width, height, BPP before calling loadBMP
Sandbox execution
allRun NTSC-CRT in a sandboxed/containerized environment with limited privileges
docker run --read-only --cap-drop=ALL -v /safe/input:/input ntsc-crt
🧯 If You Can't Patch
- Discontinue use of NTSC-CRT for processing untrusted BMP files
- Implement application allowlisting to prevent execution of vulnerable NTSC-CRT binary
🔍 How to Verify
Check if Vulnerable:
Check if NTSC-CRT version is 2.2.1 and contains the vulnerable loadBMP function in bmp_rw.cCheck Version:
Check source code or binary metadata for version 2.2.1Verify Fix Applied:
No official fix available; verify custom mitigations are implemented📡 Detection & Monitoring
Log Indicators:
- Application crashes when processing BMP files
- Memory access violation errors
Network Indicators:
- Unusual BMP file transfers to systems running NTSC-CRT
SIEM Query:
Process:NTSC-CRT AND (EventID:1000 OR ExceptionCode:c0000005)