CVE-2025-29069
📋 TL;DR
A heap buffer overflow vulnerability exists in lcms2-2.16's UnrollChunkyBytes function in cmspack.c, which handles color space transformations. This could allow attackers to execute arbitrary code or cause denial of service by exploiting improper memory handling. The vulnerability affects systems using Little CMS (lcms2) for color management, though the supplier disputes this is a library issue.
💻 Affected Systems
- Little CMS (lcms2)
⚠️ Manual Verification Required
This CVE does not have specific version information in our database, so automatic vulnerability detection cannot determine if your system is affected.
Why? The CVE database entry doesn't specify which versions are vulnerable (no version ranges provided by the vendor/NVD).
🔒 Custom verification scripts are available for registered users. Sign up free to download automated test scripts.
- Review the CVE details at NVD
- Check vendor security advisories for your specific version
- Test if the vulnerability is exploitable in your environment
- Consider updating to the latest version as a precaution
⚠️ 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 affecting specific color processing operations.
If Mitigated
Contained application failure without system compromise if proper memory protections are enabled.
🎯 Exploit Status
Exploitation requires crafting specific color space transformation inputs; no public exploits are known as of analysis.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Not specified - vendor disputes vulnerability
Vendor Advisory: https://github.com/mm2/Little-CMS/issues/476
Restart Required: No
Instructions:
1. Monitor the GitHub issue for official patches. 2. Consider updating to latest lcms2 version if available. 3. Review third-party applications using lcms2 for their own patches.
🔧 Temporary Workarounds
Input Validation
allImplement strict input validation for color space transformation operations
Memory Protection
linuxEnable ASLR and DEP/stack protection on systems using lcms2
# Linux: ensure ASLR is enabled
sysctl -w kernel.randomize_va_space=2
🧯 If You Can't Patch
- Isolate systems using lcms2 behind firewalls with strict input filtering
- Monitor for abnormal memory usage or crashes in applications using color processing
🔍 How to Verify
Check if Vulnerable:
Check if lcms2 version 2.16 is installed and used by applications for color processingCheck Version:
# Check lcms2 version: lcms2-config --version or check package managerVerify Fix Applied:
Verify lcms2 is updated beyond version 2.16 or applications have implemented input validation📡 Detection & Monitoring
Log Indicators:
- Application crashes during color processing operations
- Memory access violation errors in application logs
Network Indicators:
- Unusual image/color processing requests to web applications
SIEM Query:
Application:lcms2 AND (EventID:1000 OR "access violation" OR "heap corruption")