CVE-2023-26733
📋 TL;DR
A buffer overflow vulnerability in tinyTIFF v3.0 allows a local attacker to cause denial of service by exploiting the TinyTiffReader_readNextFrame function. This affects systems using the vulnerable tinyTIFF library to process TIFF image files. The attacker must have local access to execute malicious code.
💻 Affected Systems
- tinyTIFF
📦 What is this software?
Tinytiff by Tinytiff Project
⚠️ Risk & Real-World Impact
Worst Case
Local privilege escalation leading to full system compromise if combined with other vulnerabilities, or persistent denial of service crashing affected applications.
Likely Case
Application crash causing denial of service for processes using the tinyTIFF library to parse TIFF files.
If Mitigated
Limited impact with proper sandboxing and privilege separation, potentially just application restart.
🎯 Exploit Status
Proof of concept available in GitHub issues. Requires local access and ability to supply malicious TIFF file to vulnerable application.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check GitHub repository for latest version
Vendor Advisory: https://github.com/jkriege2/TinyTIFF/issues/19
Restart Required: Yes
Instructions:
1. Update tinyTIFF to latest version from GitHub repository. 2. Recompile any applications using tinyTIFF with updated library. 3. Restart affected applications.
🔧 Temporary Workarounds
Disable TIFF processing
allTemporarily disable TIFF file processing in applications using tinyTIFF
Input validation
allImplement strict validation of TIFF files before passing to tinyTIFF library
🧯 If You Can't Patch
- Implement strict file upload restrictions for TIFF files
- Run applications using tinyTIFF with minimal privileges and in sandboxed environments
🔍 How to Verify
Check if Vulnerable:
Check if application links against tinyTIFF v3.0 library using ldd (Linux) or dependency walker toolsCheck Version:
Check library version in source code or compiled binary metadataVerify Fix Applied:
Verify tinyTIFF library version is updated and applications are recompiled with fixed version📡 Detection & Monitoring
Log Indicators:
- Application crashes when processing TIFF files
- Segmentation faults in processes using tinyTIFF
Network Indicators:
- Not applicable - local exploitation only
SIEM Query:
Process monitoring for applications using tinyTIFF library with crash events🔗 References
- https://github.com/10cksYiqiyinHangzhouTechnology/Security-Issue-Report-of-TinyTIFF/blob/main/README.md
- https://github.com/jkriege2/TinyTIFF/issues/19
- https://github.com/10cksYiqiyinHangzhouTechnology/Security-Issue-Report-of-TinyTIFF/blob/main/README.md
- https://github.com/jkriege2/TinyTIFF/issues/19
