CVE-2025-31177
📋 TL;DR
CVE-2025-31177 is a heap buffer overflow vulnerability in gnuplot's utf8_copy_one function that could allow attackers to execute arbitrary code or cause denial of service. This affects systems running vulnerable versions of gnuplot, particularly those processing untrusted data files or scripts. The vulnerability is rated CVSS 5.5 (Medium severity).
💻 Affected Systems
- gnuplot
📦 What is this software?
Gnuplot by Gnuplot
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete system compromise, data theft, or persistent backdoor installation.
Likely Case
Application crash (denial of service) when processing maliciously crafted input files or scripts.
If Mitigated
Limited impact with proper input validation and sandboxing, potentially just application termination.
🎯 Exploit Status
Exploitation requires crafting malicious input that triggers the buffer overflow. No public exploit code is currently available.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check vendor-specific updates (Red Hat, Debian, etc.) for patched versions
Vendor Advisory: https://access.redhat.com/security/cve/CVE-2025-31177
Restart Required: No
Instructions:
1. Check your distribution's security advisories. 2. Update gnuplot using your package manager (apt-get update && apt-get upgrade gnuplot for Debian/Ubuntu, yum update gnuplot for RHEL/CentOS). 3. Verify the update was successful.
🔧 Temporary Workarounds
Input Validation
allImplement strict input validation for gnuplot scripts and data files
Sandbox Execution
linuxRun gnuplot in a sandboxed or containerized environment with limited privileges
docker run --read-only --cap-drop=ALL -v /safe/data:/data gnuplot
🧯 If You Can't Patch
- Restrict gnuplot usage to trusted users and data sources only
- Implement network segmentation to isolate systems running vulnerable gnuplot versions
🔍 How to Verify
Check if Vulnerable:
Check gnuplot version and compare against patched versions in vendor advisoriesCheck Version:
gnuplot --versionVerify Fix Applied:
Verify gnuplot version matches or exceeds patched version from vendor advisory📡 Detection & Monitoring
Log Indicators:
- Unexpected gnuplot crashes
- Segmentation fault errors in system logs
- Abnormal memory usage patterns
Network Indicators:
- Unusual outbound connections from gnuplot processes
- Data exfiltration from systems running gnuplot
SIEM Query:
process_name:"gnuplot" AND (event_type:"crash" OR memory_usage:>threshold)