CVE-2017-5225
📋 TL;DR
CVE-2017-5225 is a heap buffer overflow vulnerability in LibTIFF's tiffcp tool that allows attackers to cause denial of service or potentially execute arbitrary code by providing a crafted BitsPerSample value in a TIFF image. This affects systems processing TIFF files with vulnerable LibTIFF versions, particularly those using tiffcp for image conversion or manipulation.
💻 Affected Systems
- LibTIFF
- Applications using LibTIFF library
- Systems with tiffcp tool
📦 What is this software?
Libtiff by Libtiff
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete system compromise, data theft, or persistent backdoor installation.
Likely Case
Denial of service through application crashes when processing malicious TIFF files.
If Mitigated
Application crash without code execution if memory protections like ASLR are enabled.
🎯 Exploit Status
Proof-of-concept code exists in bug reports. Exploitation requires crafting a malicious TIFF file with specific BitsPerSample values.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: LibTIFF 4.0.8 and later
Vendor Advisory: http://bugzilla.maptools.org/show_bug.cgi?id=2656
Restart Required: No
Instructions:
1. Update LibTIFF to version 4.0.8 or later. 2. For Linux distributions: Use package manager (apt-get update && apt-get upgrade libtiff5 for Debian/Ubuntu, yum update libtiff for RHEL/CentOS). 3. Recompile applications using LibTIFF with updated library.
🔧 Temporary Workarounds
Disable tiffcp usage
linuxRemove or restrict execution of tiffcp tool to prevent exploitation
sudo chmod 000 /usr/bin/tiffcp
sudo mv /usr/bin/tiffcp /usr/bin/tiffcp.disabled
Input validation for TIFF files
allImplement file validation to reject TIFF files with abnormal BitsPerSample values
🧯 If You Can't Patch
- Implement strict file upload controls to block TIFF files from untrusted sources
- Use application sandboxing or containerization to limit impact of potential exploitation
🔍 How to Verify
Check if Vulnerable:
Check LibTIFF version with: tiffcp -v 2>&1 | grep Version or dpkg -l | grep libtiffCheck Version:
tiffcp -v 2>&1 | grep Version || dpkg -l | grep libtiff || rpm -qa | grep libtiffVerify Fix Applied:
Confirm version is 4.0.8 or higher: tiffcp -v 2>&1 | grep 'Version 4.0.[8-9]\|Version 4.[1-9]'📡 Detection & Monitoring
Log Indicators:
- Application crashes with segmentation faults when processing TIFF files
- Unexpected tiffcp process terminations
Network Indicators:
- Unusual TIFF file uploads to web applications
- TIFF file transfers with abnormal metadata
SIEM Query:
process_name:tiffcp AND (event_type:crash OR exit_code:139)🔗 References
- http://bugzilla.maptools.org/show_bug.cgi?id=2656
- http://bugzilla.maptools.org/show_bug.cgi?id=2657
- http://www.debian.org/security/2017/dsa-3844
- http://www.securityfocus.com/bid/95413
- http://www.securitytracker.com/id/1037911
- https://github.com/vadz/libtiff/commit/5c080298d59efa53264d7248bbe3a04660db6ef7
- https://security.gentoo.org/glsa/201709-27
- http://bugzilla.maptools.org/show_bug.cgi?id=2656
- http://bugzilla.maptools.org/show_bug.cgi?id=2657
- http://www.debian.org/security/2017/dsa-3844
- http://www.securityfocus.com/bid/95413
- http://www.securitytracker.com/id/1037911
- https://github.com/vadz/libtiff/commit/5c080298d59efa53264d7248bbe3a04660db6ef7
- https://security.gentoo.org/glsa/201709-27
