CVE-2024-26540
📋 TL;DR
A heap-based buffer overflow vulnerability in CImg library versions before 3.3.3 allows attackers to execute arbitrary code or cause denial of service by providing a specially crafted Analyze file format image. This affects any application that uses CImg library to process Analyze medical image files.
💻 Affected Systems
- CImg library
- Applications using CImg library for Analyze format image processing
📦 What is this software?
Cimg by Cimg
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution with the privileges of the application processing the image file, potentially leading to complete system compromise.
Likely Case
Application crash (denial of service) when processing malicious Analyze format files.
If Mitigated
Application crash with proper memory protections (ASLR, DEP) limiting code execution impact.
🎯 Exploit Status
Exploitation requires crafting a malicious Analyze format file and getting it processed by vulnerable application.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 3.3.3
Vendor Advisory: https://github.com/GreycLab/CImg/issues/403
Restart Required: No
Instructions:
1. Update CImg library to version 3.3.3 or later. 2. Recompile any applications using CImg with the updated library. 3. Replace any statically linked CImg libraries in applications.
🔧 Temporary Workarounds
Disable Analyze format processing
allModify applications to disable or remove support for Analyze format image loading
Input validation
allImplement strict validation of Analyze file headers before processing
🧯 If You Can't Patch
- Implement strict file type validation to reject untrusted Analyze format files
- Run vulnerable applications with reduced privileges and memory protection controls (ASLR, DEP)
🔍 How to Verify
Check if Vulnerable:
Check CImg library version in source code or compiled application. If version < 3.3.3 and application processes Analyze format files, it is vulnerable.Check Version:
Check CImg.h header file for #define cimg_version value (should be >= 33300 for 3.3.3)Verify Fix Applied:
Verify CImg library version is 3.3.3 or later and recompile applications with updated library.📡 Detection & Monitoring
Log Indicators:
- Application crashes when processing image files
- Memory access violation errors in application logs
Network Indicators:
- Unusual Analyze format file uploads to applications
SIEM Query:
Application: (cimg OR "CImg") AND Event: (crash OR "access violation" OR "buffer overflow")