CVE-2025-29070
📋 TL;DR
A heap buffer overflow vulnerability exists in the smooth2() function of lcms2-2.16's cmsgamma.c file. This could allow remote attackers to cause denial of service by crashing applications using the vulnerable library. The supplier disputes exploitability, stating this function is only used for low-level programming and investigation.
💻 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, though disputed by supplier
Likely Case
Denial of service through application crashes when processing malicious color profiles
If Mitigated
No impact if the vulnerable function is not called in normal operation
🎯 Exploit Status
Supplier disputes exploitability, stating the vulnerable function is never called in normal operations. No known exploits in the wild.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: lcms2-2.17 or later
Vendor Advisory: https://github.com/mm2/Little-CMS/issues/475
Restart Required: Yes
Instructions:
1. Check current lcms2 version
2. Update to lcms2-2.17 or later
3. Rebuild applications using lcms2
4. Restart affected services
🔧 Temporary Workarounds
Disable smooth2 function usage
allConfigure applications to avoid calling the vulnerable smooth2() function
Application-specific configuration required
🧯 If You Can't Patch
- Isolate systems using lcms2 from untrusted input sources
- Implement strict input validation for color profile files
🔍 How to Verify
Check if Vulnerable:
Check lcms2 library version: lcms2-config --version or check package managerCheck Version:
lcms2-config --versionVerify Fix Applied:
Verify version is 2.17 or higher: lcms2-config --version | grep -q '^2\.1[7-9]\|^[3-9]'📡 Detection & Monitoring
Log Indicators:
- Application crashes with segmentation faults
- Memory corruption errors in application logs
Network Indicators:
- Unusual color profile file transfers to vulnerable systems
SIEM Query:
source="application_logs" AND ("segmentation fault" OR "heap corruption") AND process="*lcms*"