CVE-2022-33328
📋 TL;DR
CVE-2022-33328 is a critical command injection vulnerability in Robustel R1510 routers that allows remote attackers to execute arbitrary commands via specially crafted network packets to the /ajax/remove/ API endpoint. This affects organizations using Robustel R1510 routers for industrial or network connectivity. Successful exploitation gives attackers complete control over affected devices.
💻 Affected Systems
- Robustel R1510
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of the router leading to network pivot, data exfiltration, ransomware deployment, or use as a botnet node.
Likely Case
Router takeover enabling network reconnaissance, credential harvesting, and lateral movement within the network.
If Mitigated
Limited impact if network segmentation isolates the router and strict firewall rules block external access.
🎯 Exploit Status
The Talos Intelligence report includes technical details that could be used to create exploits. The vulnerability requires sending crafted packets to the web interface.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check with Robustel for updated firmware
Vendor Advisory: https://talosintelligence.com/vulnerability_reports/TALOS-2022-1573
Restart Required: Yes
Instructions:
1. Contact Robustel support for patched firmware. 2. Backup router configuration. 3. Upload and install updated firmware via web interface or CLI. 4. Reboot router. 5. Verify firmware version.
🔧 Temporary Workarounds
Network Access Control
linuxRestrict access to the router's web interface using firewall rules
iptables -A INPUT -p tcp --dport 80 -s trusted_ip -j ACCEPT
iptables -A INPUT -p tcp --dport 443 -s trusted_ip -j ACCEPT
iptables -A INPUT -p tcp --dport 80 -j DROP
iptables -A INPUT -p tcp --dport 443 -j DROP
Disable Web Interface
allTurn off the web server functionality if not required
Check Robustel documentation for web server disable commands
🧯 If You Can't Patch
- Isolate the router in a dedicated VLAN with strict firewall rules blocking all unnecessary traffic
- Implement network monitoring and intrusion detection specifically for the /ajax/remove/ endpoint
🔍 How to Verify
Check if Vulnerable:
Check firmware version via web interface (System > Status) or CLI using 'show version' commandCheck Version:
show versionVerify Fix Applied:
Verify firmware version is updated beyond 3.3.0 and test /ajax/remove/ endpoint with safe payloads📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to /ajax/remove/ endpoint
- Suspicious command execution in system logs
- Multiple failed login attempts followed by successful access
Network Indicators:
- Unusual outbound connections from router
- Traffic to /ajax/remove/ with command injection patterns
- Unexpected SSH or telnet sessions originating from router
SIEM Query:
source="router_logs" AND (url="/ajax/remove/" OR command="*;*" OR command="*|*" OR command="*`*" OR command="*$(*")