CVE-2022-33326
📋 TL;DR
CVE-2022-33326 allows remote attackers to execute arbitrary commands on Robustel R1510 routers through command injection in the /ajax/config_rollback/ API endpoint. This affects organizations using Robustel R1510 routers for industrial networking, potentially allowing complete device compromise.
💻 Affected Systems
- Robustel R1510 Industrial Cellular Router
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete device takeover leading to network pivoting, data exfiltration, or deployment of persistent malware across connected industrial systems.
Likely Case
Router compromise allowing traffic interception, credential theft, and disruption of industrial control communications.
If Mitigated
Limited impact if network segmentation prevents lateral movement and strict access controls are enforced.
🎯 Exploit Status
Exploitation requires network access to the web interface but authentication status is unclear from available reports. The vulnerability is well-documented with technical details.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check with Robustel for updated firmware
Vendor Advisory: https://www.robustel.com/security-advisory/
Restart Required: Yes
Instructions:
1. Contact Robustel support for latest firmware. 2. Backup current configuration. 3. Upload new firmware via web interface. 4. Reboot device. 5. Restore configuration if needed.
🔧 Temporary Workarounds
Network Access Restriction
linuxBlock access to the web interface from untrusted networks
iptables -A INPUT -p tcp --dport 80 -s trusted_network -j ACCEPT
iptables -A INPUT -p tcp --dport 443 -s trusted_network -j ACCEPT
iptables -A INPUT -p tcp --dport 80 -j DROP
iptables -A INPUT -p tcp --dport 443 -j DROP
API Endpoint Blocking
linuxBlock access to the vulnerable /ajax/config_rollback/ endpoint
iptables -A INPUT -p tcp --dport 80 -m string --string "POST /ajax/config_rollback/" --algo bm -j DROP
🧯 If You Can't Patch
- Segment affected routers in isolated network zones with strict firewall rules
- Implement network monitoring for suspicious API calls to /ajax/config_rollback/
🔍 How to Verify
Check if Vulnerable:
Check firmware version via web interface at System > System Information or via SSH with 'cat /etc/version'Check Version:
ssh admin@router_ip 'cat /etc/version' or check web interfaceVerify Fix Applied:
Verify firmware version is updated beyond 3.3.0 and test API endpoint with safe payloads📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to /ajax/config_rollback/
- System command execution logs with unexpected parameters
- Failed authentication attempts followed by API calls
Network Indicators:
- HTTP POST requests to /ajax/config_rollback/ containing shell metacharacters
- Outbound connections from router to unexpected destinations
SIEM Query:
source="router_logs" AND (url="/ajax/config_rollback/" OR cmd="*;*" OR cmd="*|*" OR cmd="*`*" OR cmd="*$(*")