CVE-2025-56127
📋 TL;DR
This CVE describes an OS command injection vulnerability in Ruijie RG-BCR600W routers that allows attackers to execute arbitrary commands via crafted POST requests to the get_wanobj endpoint. Attackers can gain unauthorized access and potentially take full control of affected devices. Organizations using Ruijie RG-BCR600W routers are affected.
💻 Affected Systems
- Ruijie RG-BCR600W
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete device compromise leading to network infiltration, data exfiltration, lateral movement to other systems, and persistent backdoor installation.
Likely Case
Unauthorized command execution leading to device configuration changes, network disruption, credential theft, and potential use as a pivot point for further attacks.
If Mitigated
Limited impact with proper network segmentation, command validation, and input sanitization preventing successful exploitation.
🎯 Exploit Status
Exploit requires sending crafted POST requests to /usr/lib/lua/luci/controller/admin/common.lua endpoint. Public proof-of-concept exists in GitHub repository.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: Not available
Restart Required: No
Instructions:
1. Monitor Ruijie official website for security advisories. 2. Apply firmware updates when available. 3. Verify patch addresses CVE-2025-56127 specifically.
🔧 Temporary Workarounds
Network Access Control
linuxRestrict access to web management interface using firewall rules
iptables -A INPUT -p tcp --dport 80 -j DROP
iptables -A INPUT -p tcp --dport 443 -j DROP
Input Validation Enhancement
allImplement input sanitization for POST parameters in Lua scripts
Modify /usr/lib/lua/luci/controller/admin/common.lua to validate and sanitize user inputs
🧯 If You Can't Patch
- Isolate affected devices in separate network segments with strict firewall rules
- Disable web management interface if not required and use console/SSH access only
🔍 How to Verify
Check if Vulnerable:
Check if device responds to crafted POST requests at /usr/lib/lua/luci/controller/admin/common.lua endpoint with command injection payloadsCheck Version:
cat /etc/version or check web interface firmware versionVerify Fix Applied:
Test if command injection attempts are properly blocked and inputs are sanitized📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to /usr/lib/lua/luci/controller/admin/common.lua
- Suspicious command execution in system logs
- Multiple failed authentication attempts
Network Indicators:
- Unusual outbound connections from router
- Traffic patterns indicating command and control activity
- Port scanning originating from router
SIEM Query:
source="router_logs" AND (url="/usr/lib/lua/luci/controller/admin/common.lua" OR cmd="*;*" OR cmd="*|*")