CVE-2023-52173
📋 TL;DR
CVE-2023-52173 is a critical out-of-bounds write vulnerability in XnView Classic for Windows that allows attackers to execute arbitrary code by triggering a write access violation. This affects all Windows users running XnView Classic versions before 2.51.3. Successful exploitation could lead to complete system compromise.
💻 Affected Systems
- XnView Classic
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to full system compromise, data theft, ransomware deployment, or persistent backdoor installation.
Likely Case
Application crash leading to denial of service, with potential for code execution if attackers can control the memory corruption.
If Mitigated
Application crash without code execution if exploit attempts are blocked by security controls.
🎯 Exploit Status
Proof-of-concept crash reports are publicly available. The write access violation at a specific offset suggests reliable exploitation is possible.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 2.51.3
Vendor Advisory: https://newsgroup.xnview.com/viewtopic.php?f=35&t=46016
Restart Required: Yes
Instructions:
1. Download XnView Classic 2.51.3 or later from the official website. 2. Run the installer. 3. Follow installation prompts. 4. Restart the application.
🔧 Temporary Workarounds
Disable automatic image processing
windowsPrevent XnView from automatically opening or processing untrusted image files.
Configure XnView settings to disable automatic file associations and preview features
Application control policy
windowsRestrict XnView execution to trusted directories only.
Use Windows AppLocker or similar to restrict XnView to specific paths
🧯 If You Can't Patch
- Uninstall XnView Classic and use alternative image viewers like XnView MP or IrfanView
- Implement network segmentation to isolate systems running vulnerable versions
🔍 How to Verify
Check if Vulnerable:
Check XnView version in Help > About. If version is below 2.51.3, the system is vulnerable.Check Version:
xnview.exe --version or check Help > About in the applicationVerify Fix Applied:
After updating, verify version shows 2.51.3 or higher in Help > About.📡 Detection & Monitoring
Log Indicators:
- Application crash logs showing write access violation at xnview.exe+0x3ADBD0
- Unexpected termination of xnview.exe process
Network Indicators:
- Unusual network connections originating from XnView process
SIEM Query:
Process:xnview.exe AND (EventID:1000 OR ExceptionCode:c0000005) AND ExceptionOffset:3ADBD0🔗 References
- https://github.com/seyit-sigirci/Vulnerability-Disclosures/blob/main/XNView-Crash-Reports/BOF%5B0x54D%5D%2B3%7B%2B0~3%23460c%7D%20469.15d%20%40%20xnview.exe%2B0x3ADBD0.html
- https://newsgroup.xnview.com/viewtopic.php?f=35&t=46016
- https://github.com/seyit-sigirci/Vulnerability-Disclosures/blob/main/XNView-Crash-Reports/BOF%5B0x54D%5D%2B3%7B%2B0~3%23460c%7D%20469.15d%20%40%20xnview.exe%2B0x3ADBD0.html
- https://newsgroup.xnview.com/viewtopic.php?f=35&t=46016
