CVE-2025-31181
📋 TL;DR
A NULL pointer dereference vulnerability in gnuplot's X11_graphics() function can cause segmentation faults and system crashes when processing malicious input. This affects systems running vulnerable versions of gnuplot with X11 graphics support enabled. Users who process untrusted data files with gnuplot are at risk.
💻 Affected Systems
- gnuplot
📦 What is this software?
Gnuplot by Gnuplot
⚠️ Risk & Real-World Impact
Worst Case
Complete system crash leading to denial of service, potential data loss if unsaved work is interrupted, and possible privilege escalation if combined with other vulnerabilities.
Likely Case
Application crash and denial of service for gnuplot processes, potentially affecting dependent scripts or workflows.
If Mitigated
Minimal impact with proper input validation and sandboxing; crashes would be contained to the gnuplot process.
🎯 Exploit Status
Exploitation requires ability to supply malicious input to gnuplot, typically through crafted data files or scripts. No authentication bypass required if user already has file upload/creation capabilities.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check Red Hat advisory for specific patched versions
Vendor Advisory: https://access.redhat.com/security/cve/CVE-2025-31181
Restart Required: No
Instructions:
1. Check your distribution's security updates. 2. For RHEL/CentOS: 'yum update gnuplot'. 3. For Debian/Ubuntu: 'apt update && apt upgrade gnuplot'. 4. For source installations: Download and compile latest version from gnuplot.sourceforge.net.
🔧 Temporary Workarounds
Disable X11 terminal
linuxForce gnuplot to use non-X11 terminal types to avoid vulnerable code path
export GNUTERM=qt
export GNUTERM=wxt
export GNUTERM=png
Input validation
allValidate all input files before processing with gnuplot
🧯 If You Can't Patch
- Restrict gnuplot usage to trusted users only
- Implement strict file upload validation and sandbox gnuplot execution
🔍 How to Verify
Check if Vulnerable:
Check gnuplot version and if X11 support is compiled: 'gnuplot --version' and test with 'set terminal x11'Check Version:
gnuplot --versionVerify Fix Applied:
Verify updated version and test with known problematic inputs if available📡 Detection & Monitoring
Log Indicators:
- Segmentation fault messages in system logs
- Gnuplot crash reports
- Core dumps from gnuplot process
SIEM Query:
process.name:"gnuplot" AND (event.action:"segmentation_fault" OR exit_code:"139")