CVE-2020-6151
📋 TL;DR
This is a critical memory corruption vulnerability in Accusoft ImageGear's TIFF file parser. Attackers can exploit it by providing specially crafted TIFF files, potentially leading to remote code execution. Any application using ImageGear 19.7 to process TIFF files is vulnerable.
💻 Affected Systems
- Accusoft ImageGear
📦 What is this software?
Imagegear by Accusoft
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution with SYSTEM/root privileges, complete system compromise, and potential lateral movement across networks.
Likely Case
Application crash leading to denial of service, with potential for remote code execution in vulnerable configurations.
If Mitigated
Application crash with limited impact if proper sandboxing and privilege separation are implemented.
🎯 Exploit Status
Proof-of-concept exploit code is publicly available. Exploitation requires only a malicious TIFF file to be processed by the vulnerable software.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 19.8 or later
Vendor Advisory: https://www.accusoft.com/products/imagegear-collection/imagegear/
Restart Required: Yes
Instructions:
1. Upgrade to ImageGear version 19.8 or later. 2. Replace the vulnerable ImageGear library files. 3. Restart all applications using ImageGear. 4. Recompile applications if using ImageGear as a library.
🔧 Temporary Workarounds
Disable TIFF file processing
allConfigure applications to reject or not process TIFF files using ImageGear
Implement file type validation
allAdd strict file validation before passing to ImageGear library
🧯 If You Can't Patch
- Implement network segmentation to isolate vulnerable systems
- Deploy application sandboxing and privilege reduction for ImageGear processes
🔍 How to Verify
Check if Vulnerable:
Check ImageGear library version - if it's 19.7, the system is vulnerable. Check if applications use ImageGear for TIFF processing.Check Version:
Check application dependencies or library files for ImageGear version informationVerify Fix Applied:
Verify ImageGear version is 19.8 or later. Test with known malicious TIFF files to ensure they are rejected or processed safely.📡 Detection & Monitoring
Log Indicators:
- Application crashes when processing TIFF files
- Memory access violation errors in application logs
- Unexpected process termination
Network Indicators:
- Inbound TIFF file transfers to vulnerable systems
- Outbound connections from ImageGear processes after TIFF processing
SIEM Query:
source="application_logs" AND ("ImageGear" OR "TIFF") AND ("crash" OR "access violation" OR "segmentation fault")