CVE-2024-46258
📋 TL;DR
CVE-2024-46258 is a heap buffer overflow vulnerability in cute_png v1.05's cp_load_png_mem() function that allows attackers to execute arbitrary code or cause denial of service by processing specially crafted PNG files. This affects any application or system using the vulnerable cute_png library to parse PNG images. The vulnerability is particularly dangerous in applications that process untrusted PNG files from external sources.
💻 Affected Systems
- cute_png library
- Applications embedding cute_png v1.05
📦 What is this software?
Cute Png by Randygaul
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete system compromise, data theft, or ransomware deployment
Likely Case
Application crash (denial of service) or limited memory corruption leading to instability
If Mitigated
Contained application crash with no privilege escalation if proper sandboxing and memory protections are enabled
🎯 Exploit Status
Proof-of-concept exploit files (sample2.png) are publicly available in the GitHub repository, making exploitation straightforward for attackers
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Not available
Vendor Advisory: No official vendor advisory found
Restart Required: No
Instructions:
1. Check if your application uses cute_png v1.05. 2. Monitor the cute_png repository for updates. 3. Consider switching to alternative PNG parsing libraries if available. 4. Recompile applications with patched library once available.
🔧 Temporary Workarounds
Input Validation and Sanitization
allImplement strict validation of PNG files before processing with cute_png library
Memory Protection Controls
allEnable ASLR, DEP, and other memory protection mechanisms to reduce exploit effectiveness
# Linux: sysctl -w kernel.randomize_va_space=2
# Windows: Enable Data Execution Prevention (DEP) via System Properties
🧯 If You Can't Patch
- Implement network segmentation to isolate systems using cute_png from critical infrastructure
- Deploy application allowlisting to prevent execution of unauthorized code even if exploitation occurs
🔍 How to Verify
Check if Vulnerable:
Check if your application includes cute_png.h version 1.05. Search source code for 'cute_png' and version identifiers. Test with the provided PoC PNG file (sample2.png) to see if it causes crashes.Check Version:
grep -r "cute_png" . --include="*.h" --include="*.c" --include="*.cpp" | grep -i versionVerify Fix Applied:
Once patched version is available, verify by: 1. Checking library version is >1.05. 2. Testing with the PoC PNG file to ensure no crashes occur. 3. Running comprehensive PNG parsing tests.📡 Detection & Monitoring
Log Indicators:
- Application crashes with memory access violations
- Unexpected termination of PNG processing applications
- Heap corruption errors in application logs
Network Indicators:
- Unusual PNG file uploads to web applications
- PNG files with abnormal structure or sizes
SIEM Query:
source="application_logs" AND ("segmentation fault" OR "access violation" OR "heap corruption") AND process="*png*"🔗 References
- https://github.com/Helson-S/FuzzyTesting/blob/master/cute_headers/cute_png/heapof-r1-cp_load_png_mem-cute_png-1105c15
- https://github.com/Helson-S/FuzzyTesting/blob/master/cute_headers/cute_png/heapof-r1-cp_load_png_mem-cute_png-1105c15/poc
- https://github.com/Helson-S/FuzzyTesting/blob/master/cute_headers/cute_png/heapof-r1-cp_load_png_mem-cute_png-1105c15/poc/sample2.png
- https://github.com/Helson-S/FuzzyTesting/blob/master/cute_headers/cute_png/heapof-r1-cp_load_png_mem-cute_png-1105c15/vulDescription.assets/image-20240527231514578.png
- https://github.com/Helson-S/FuzzyTesting/blob/master/cute_headers/cute_png/heapof-r1-cp_load_png_mem-cute_png-1105c15/vulDescription.md
