CVE-2022-26999
📋 TL;DR
The Arris TR3300 router contains a command injection vulnerability in its static IP configuration function. Attackers can execute arbitrary system commands by sending specially crafted requests to the affected parameters. This affects all users running the vulnerable firmware version.
💻 Affected Systems
- Arris TR3300
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Full router compromise allowing attackers to intercept all network traffic, install persistent backdoors, pivot to internal networks, and potentially brick the device.
Likely Case
Router takeover enabling traffic interception, DNS hijacking, credential theft, and launching attacks against internal devices.
If Mitigated
Limited impact if router is behind firewall with restricted WAN access and proper network segmentation.
🎯 Exploit Status
Exploitation requires authentication to router admin interface. Public proof-of-concept demonstrates command injection.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: Not available
Restart Required: Yes
Instructions:
1. Check vendor website for firmware updates
2. Download latest firmware
3. Access router admin interface
4. Navigate to firmware update section
5. Upload and apply new firmware
6. Reboot router
🔧 Temporary Workarounds
Disable Static IP Configuration
allUse DHCP instead of static IP configuration to avoid vulnerable function
Restrict Admin Interface Access
allLimit admin interface access to specific IP addresses or disable remote administration
🧯 If You Can't Patch
- Replace router with supported model from different vendor
- Place router behind dedicated firewall with strict inbound rules
🔍 How to Verify
Check if Vulnerable:
Check router firmware version in admin interface under System Status or About pageCheck Version:
Login to router admin interface and navigate to System InformationVerify Fix Applied:
Verify firmware version is newer than v1.0.13 and test static IP configuration functionality📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to static IP configuration endpoints
- Commands containing shell metacharacters in parameter values
- Multiple failed authentication attempts followed by successful login
Network Indicators:
- Unusual outbound connections from router
- DNS queries to suspicious domains
- Unexpected port scans originating from router
SIEM Query:
source="router_logs" AND (uri_path="/cgi-bin/static_ip.cgi" OR parameters CONTAINS "wan_ip_stat" OR parameters CONTAINS "|" OR parameters CONTAINS ";" OR parameters CONTAINS "`")