CVE-2025-65882
📋 TL;DR
This vulnerability in openmptcprouter allows attackers to write arbitrary files or execute arbitrary commands via improper neutralization of special elements used in an OS command (OS command injection). It affects all users running vulnerable versions of openmptcprouter.
💻 Affected Systems
- openmptcprouter
📦 What is this software?
Openmptcprouter by Openmptcprouter
⚠️ Risk & Real-World Impact
Worst Case
Full system compromise with root-level arbitrary command execution leading to complete control of the router device.
Likely Case
Remote code execution allowing attackers to install malware, pivot to internal networks, or disrupt routing services.
If Mitigated
Limited impact if proper network segmentation and least privilege principles are implemented.
🎯 Exploit Status
Proof of concept available in GitHub gist. Exploitation requires some level of access to the sysupgrade functionality.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Fixed in commit 09393d1c41a227bea7d5b85c0a06221b1302b25f and later
Vendor Advisory: https://github.com/Ysurac/openmptcprouter/commit/09393d1c41a227bea7d5b85c0a06221b1302b25f
Restart Required: Yes
Instructions:
1. Update openmptcprouter to latest version 2. Apply commit 09393d1c41a227bea7d5b85c0a06221b1302b25f 3. Restart the router services
🔧 Temporary Workarounds
Disable sysupgrade functionality
linuxTemporarily disable the vulnerable sysupgrade component
systemctl disable sysupgrade
chmod -x /usr/bin/sysupgrade
Restrict access to management interface
linuxLimit network access to openmptcprouter management interface
iptables -A INPUT -p tcp --dport 22 -s trusted_ip -j ACCEPT
iptables -A INPUT -p tcp --dport 22 -j DROP
🧯 If You Can't Patch
- Implement strict network segmentation to isolate openmptcprouter from critical internal networks
- Enable detailed logging and monitoring for any sysupgrade-related activities
🔍 How to Verify
Check if Vulnerable:
Check if running openmptcprouter version <= 0.64 and examine sysupgrade.c for vulnerable create_xor_ipad_opad functionCheck Version:
cat /etc/openmptcprouter-version || openmptcprouter --versionVerify Fix Applied:
Verify commit 09393d1c41a227bea7d5b85c0a06221b1302b25f is applied and version > 0.64📡 Detection & Monitoring
Log Indicators:
- Unusual sysupgrade process executions
- Unexpected file writes in system directories
- Suspicious command execution patterns
Network Indicators:
- Unusual outbound connections from router
- Unexpected SSH or management interface access
SIEM Query:
process.name="sysupgrade" AND (cmdline="*;*" OR cmdline="*|*" OR cmdline="*`*")