CVE-2025-1609
📋 TL;DR
This CVE describes a critical OS command injection vulnerability in LB-LINK AC1900 routers. Attackers can remotely execute arbitrary commands on affected devices by manipulating the 'cmd' parameter in the websGetVar function. All users of LB-LINK AC1900 Router version 1.0.2 are affected.
💻 Affected Systems
- LB-LINK AC1900 Router
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of the router allowing attackers to install persistent backdoors, intercept all network traffic, pivot to internal networks, and use the device for botnet activities.
Likely Case
Router takeover leading to DNS hijacking, credential theft from network traffic, and use as a proxy for malicious activities.
If Mitigated
Limited impact if router is isolated from critical networks and has strict egress filtering, though device compromise still occurs.
🎯 Exploit Status
Exploit details are publicly available and the vulnerability requires no authentication to exploit.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: None available
Restart Required: Yes
Instructions:
No official patch available. Contact vendor for updated firmware or replace affected devices.
🔧 Temporary Workarounds
Network Segmentation
allIsolate the router from critical internal networks to limit potential damage from compromise.
Access Control Lists
allImplement strict firewall rules to limit access to the router's web interface from untrusted networks.
🧯 If You Can't Patch
- Immediately replace affected routers with devices from vendors that provide security updates
- Deploy network monitoring to detect exploitation attempts and anomalous router behavior
🔍 How to Verify
Check if Vulnerable:
Check router firmware version via web interface at System Status > Firmware VersionCheck Version:
Check web interface or use nmap to identify device versionVerify Fix Applied:
Verify firmware version has been updated beyond 1.0.2📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to /goform/set_cmd with shell metacharacters in parameters
- Unexpected command execution in router logs
Network Indicators:
- Anomalous outbound connections from router
- DNS queries to suspicious domains from router
SIEM Query:
source="router_logs" AND (uri="/goform/set_cmd" AND (param="cmd" AND value CONTAINS "|" OR value CONTAINS ";" OR value CONTAINS "`"))