CVE-2019-17262
📋 TL;DR
CVE-2019-17262 is an out-of-bounds write vulnerability in XnView Classic 2.49.1 that allows attackers to execute arbitrary code by exploiting a memory corruption issue. This affects users who open maliciously crafted files with the vulnerable software. Successful exploitation could lead to complete system compromise.
💻 Affected Systems
- XnView Classic
📦 What is this software?
Xnview by Xnview
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution with SYSTEM/root privileges leading to complete host takeover, data theft, and lateral movement within the network.
Likely Case
Local privilege escalation or arbitrary code execution in the context of the current user when opening malicious files.
If Mitigated
Application crash or denial of service if exploit fails or memory protections prevent code execution.
🎯 Exploit Status
Exploitation requires user interaction to open malicious files. Proof-of-concept code is available in research repositories.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: XnView Classic 2.49.2 and later
Vendor Advisory: https://www.xnview.com/en/xnview/#changelog
Restart Required: No
Instructions:
1. Download latest version from xnview.com 2. Install over existing installation 3. Verify version is 2.49.2 or higher
🔧 Temporary Workarounds
Restrict file types
allConfigure system to open image files with alternative applications
Application sandboxing
allRun XnView in restricted environments or containers
🧯 If You Can't Patch
- Remove XnView Classic 2.49.1 and use alternative image viewing software
- Implement application whitelisting to prevent execution of XnView Classic
🔍 How to Verify
Check if Vulnerable:
Check Help > About in XnView Classic - if version is 2.49.1, system is vulnerableCheck Version:
On Windows: xnview.exe --version or check About dialogVerify Fix Applied:
Verify version is 2.49.2 or higher in Help > About menu📡 Detection & Monitoring
Log Indicators:
- Application crashes with memory access violations
- Unexpected child processes spawned from xnview.exe
Network Indicators:
- Unusual outbound connections following XnView execution
SIEM Query:
Process creation where parent_process_name contains 'xnview' AND (process_name contains 'cmd' OR process_name contains 'powershell' OR process_name contains 'wscript')