CVE-2013-3246
📋 TL;DR
CVE-2013-3246 is a stack-based buffer overflow vulnerability in XnView's xnview.exe that allows remote attackers to execute arbitrary code by crafting a malicious XCF image file. This affects users who open untrusted XCF files with XnView versions before 2.03, potentially leading to complete system compromise.
💻 Affected Systems
- XnView
📦 What is this software?
Xnview by Xnview
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution with SYSTEM/administrator privileges leading to full system compromise, data theft, ransomware deployment, or persistent backdoor installation.
Likely Case
Local user opens malicious XCF file leading to arbitrary code execution with user privileges, potentially enabling malware installation or data exfiltration.
If Mitigated
No impact if XnView is not installed, patched to version 2.03+, or proper application whitelisting prevents execution of malicious payloads.
🎯 Exploit Status
Exploitation requires user to open a crafted XCF file. Public proof-of-concept code exists in advisory references.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 2.03 and later
Vendor Advisory: http://newsgroup.xnview.com/viewtopic.php?f=35&t=28727
Restart Required: No
Instructions:
1. Download XnView 2.03 or later from official website. 2. Install the update. 3. Verify version is 2.03+.
🔧 Temporary Workarounds
Disable XCF file association
windowsRemove XnView as default handler for XCF files to prevent automatic exploitation
Control Panel > Default Programs > Set Associations > Find .xcf > Change program
Application whitelisting
windowsUse AppLocker or similar to block execution of xnview.exe
🧯 If You Can't Patch
- Block XCF files at email/web gateways using file filtering
- Educate users not to open XCF files from untrusted sources
🔍 How to Verify
Check if Vulnerable:
Check XnView version: Open XnView > Help > About. If version is below 2.03, system is vulnerable.Check Version:
xnview.exe --version or check Help > About in GUIVerify Fix Applied:
Confirm version is 2.03 or higher in Help > About dialog.📡 Detection & Monitoring
Log Indicators:
- Process creation events for xnview.exe with suspicious parent processes
- Application crash logs for xnview.exe
Network Indicators:
- Downloads of XCF files from untrusted sources
- Outbound connections from xnview.exe post-file opening
SIEM Query:
process_name="xnview.exe" AND (parent_process="cmd.exe" OR parent_process="powershell.exe" OR parent_process="wscript.exe")