CVE-2023-27232
📋 TL;DR
This CVE describes a command injection vulnerability in TOTOlink A7100RU routers that allows attackers to execute arbitrary commands on the device. Attackers can exploit this by sending specially crafted requests to the /setting/setWanIeCfg endpoint. Organizations and individuals using affected TOTOlink router models are at risk.
💻 Affected Systems
- TOTOlink A7100RU
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of the router allowing persistent backdoor installation, network traffic interception, lateral movement to connected devices, and bricking of the device.
Likely Case
Router takeover leading to DNS hijacking, credential theft from network traffic, and use as a pivot point for attacks on internal networks.
If Mitigated
Limited impact if network segmentation isolates the router and external access is restricted, though local network attacks remain possible.
🎯 Exploit Status
The vulnerability is in a web interface endpoint and requires no authentication. Public proof-of-concept code exists in GitHub repositories.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: Not available
Restart Required: No
Instructions:
No official patch is available. Check TOTOlink's website for firmware updates. If an update exists, download and flash it following the manufacturer's instructions.
🔧 Temporary Workarounds
Block External Access
allConfigure firewall rules to block all external access to the router's web interface
Disable WAN Management
allDisable remote management/administration from the WAN interface in router settings
🧯 If You Can't Patch
- Replace affected routers with models from vendors that provide security updates
- Segment the network to isolate the router from critical systems
🔍 How to Verify
Check if Vulnerable:
Check router firmware version in web interface. If version is V7.4cu.2313_B20191024, the device is vulnerable.Check Version:
Check router web interface at http://[router-ip]/ or use manufacturer's management toolsVerify Fix Applied:
Verify firmware version has been updated to a version newer than V7.4cu.2313_B20191024📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to /setting/setWanIeCfg
- Suspicious commands in router logs
- Unexpected system reboots
Network Indicators:
- Unusual outbound connections from router
- DNS changes from router
- Traffic redirection
SIEM Query:
source="router_logs" AND (uri="/setting/setWanIeCfg" OR command="*;*" OR command="*|*" OR command="*`*" OR command="*$(*)")