CVE-2025-14422
📋 TL;DR
This vulnerability allows remote attackers to execute arbitrary code by tricking users into opening malicious PNM image files in GIMP. The integer overflow during PNM file parsing enables buffer overflow attacks. All GIMP users who open untrusted PNM files are affected.
💻 Affected Systems
- GIMP (GNU Image Manipulation Program)
📦 What is this software?
Gimp by Gimp
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise with attacker gaining the same privileges as the GIMP user, potentially leading to data theft, ransomware deployment, or lateral movement.
Likely Case
Local privilege escalation or malware installation on the user's system when opening malicious PNM files from untrusted sources.
If Mitigated
No impact if users only open trusted files or GIMP is updated to patched version.
🎯 Exploit Status
Exploitation requires user interaction (opening malicious file). The ZDI advisory suggests working exploit exists but details aren't public.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: GIMP with commit 4ff2d773d58064e6130495de498e440f4a6d5edb or later
Vendor Advisory: https://gitlab.gnome.org/GNOME/gimp/-/commit/4ff2d773d58064e6130495de498e440f4a6d5edb
Restart Required: Yes
Instructions:
1. Update GIMP through your package manager (apt/yum/dnf/pacman) or official installer
2. Restart GIMP after update
3. Verify version includes the fix commit
🔧 Temporary Workarounds
Disable PNM file association
allRemove PNM file type association with GIMP to prevent automatic opening
Linux: update-mime-database to remove .pnm association
Windows: Use 'Default Apps' settings to change PNM file handler
Sandbox GIMP execution
allRun GIMP in restricted environment to limit exploit impact
Linux: firejail --net=none gimp
Windows: Use Windows Sandbox or similar
🧯 If You Can't Patch
- Block PNM files at network perimeter/email filters
- Implement application allowlisting to prevent unauthorized GIMP execution
🔍 How to Verify
Check if Vulnerable:
Check if GIMP version predates commit 4ff2d773d58064e6130495de498e440f4a6d5edbCheck Version:
gimp --versionVerify Fix Applied:
Verify GIMP version includes the fix commit or check PNM file parsing doesn't crash with test files📡 Detection & Monitoring
Log Indicators:
- GIMP crash logs with PNM file references
- Unexpected process spawning from GIMP
Network Indicators:
- PNM file downloads to user workstations
- Outbound connections from GIMP process
SIEM Query:
Process:Name=gimp AND (FileExtension=.pnm OR FileExtension=.pbm OR FileExtension=.pgm OR FileExtension=.ppm)