CVE-2022-30329
📋 TL;DR
This CVE describes an OS command injection vulnerability in TRENDnet TEW-831DR routers that allows authenticated attackers to execute arbitrary shell commands through the web interface. The vulnerability affects users of specific TRENDnet router models with vulnerable firmware versions. Attackers with valid credentials can gain complete control of affected devices.
💻 Affected Systems
- TRENDnet TEW-831DR
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of the router allowing attackers to intercept all network traffic, deploy malware to connected devices, pivot to internal networks, and maintain persistent access.
Likely Case
Attackers with stolen or default credentials gain router administrative access, modify network settings, intercept sensitive data, and potentially compromise connected devices.
If Mitigated
With strong authentication and network segmentation, impact is limited to the router itself without lateral movement to other systems.
🎯 Exploit Status
Exploitation requires valid credentials but is technically simple once credentials are obtained. Public technical advisory includes exploitation details.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check TRENDnet for latest firmware updates
Vendor Advisory: https://www.trendnet.com/support/
Restart Required: Yes
Instructions:
1. Log into TRENDnet support portal. 2. Download latest firmware for TEW-831DR. 3. Access router web interface. 4. Navigate to Administration > Firmware Upgrade. 5. Upload and apply new firmware. 6. Router will reboot automatically.
🔧 Temporary Workarounds
Disable Remote Management
allPrevent external access to web interface by disabling WAN-side administration
Change Default Credentials
allUse strong, unique administrative passwords
Network Segmentation
allIsolate router management interface to dedicated VLAN
🧯 If You Can't Patch
- Implement strict network access controls to limit who can reach the router's web interface
- Enable logging and monitoring for suspicious authentication attempts and configuration changes
🔍 How to Verify
Check if Vulnerable:
Check router firmware version in web interface under Status > Device InformationCheck Version:
Login to router web interface and navigate to Status > Device InformationVerify Fix Applied:
Verify firmware version is updated beyond 1.0 601.130.1.1356📡 Detection & Monitoring
Log Indicators:
- Multiple failed login attempts followed by successful login
- Unusual configuration changes
- Shell command execution in web interface logs
Network Indicators:
- Unusual outbound connections from router
- Traffic redirection or DNS changes
- Unexpected open ports on router
SIEM Query:
source="router_logs" AND (event="authentication_success" AND user!="admin" OR command="*;*" OR command="*|*")🔗 References
- https://research.nccgroup.com/2022/06/10/technical-advisory-multiple-vulnerabilities-in-trendnet-tew-831dr-wifi-router-cve-2022-30325-cve-2022-30326-cve-2022-30327-cve-2022-30328-cve-2022-30329/
- https://research.nccgroup.com/?research=Technical+advisories
- https://research.nccgroup.com/2022/06/10/technical-advisory-multiple-vulnerabilities-in-trendnet-tew-831dr-wifi-router-cve-2022-30325-cve-2022-30326-cve-2022-30327-cve-2022-30328-cve-2022-30329/
- https://research.nccgroup.com/?research=Technical+advisories
