CVE-2023-27079
📋 TL;DR
This CVE describes a command injection vulnerability in Tenda G103 routers that allows attackers to execute arbitrary commands on the device. Attackers can exploit this by sending specially crafted network packets to vulnerable routers. This affects all users running Tenda G103 routers with vulnerable firmware.
💻 Affected Systems
- Tenda G103 router
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Full router compromise allowing attacker to intercept all network traffic, modify router settings, install persistent backdoors, and pivot to internal network devices.
Likely Case
Information disclosure and limited command execution allowing attacker to extract router credentials, configuration data, and potentially disrupt network connectivity.
If Mitigated
No impact if router is not internet-facing and network segmentation prevents access to management interfaces.
🎯 Exploit Status
Public GitHub repository contains exploit details and proof-of-concept. The vulnerability appears to be exploitable without authentication.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: No official vendor advisory found
Restart Required: Yes
Instructions:
1. Check Tenda website for firmware updates
2. If update available, download and install via router web interface
3. Reboot router after installation
4. Verify firmware version has changed from v1.0.05
🔧 Temporary Workarounds
Network Segmentation
allIsolate router management interface from untrusted networks
Access Control Lists
allRestrict access to router management interface to trusted IPs only
🧯 If You Can't Patch
- Replace vulnerable router with different model or vendor
- Place router behind firewall with strict inbound/outbound rules
🔍 How to Verify
Check if Vulnerable:
Check router firmware version via web interface at 192.168.0.1 or 192.168.1.1, login and navigate to System Status or About pageCheck Version:
curl -s http://192.168.0.1/goform/getStatus | grep versionVerify Fix Applied:
Verify firmware version is no longer v1.0.05 and attempt to access known vulnerable endpoints📡 Detection & Monitoring
Log Indicators:
- Unusual command execution in router logs
- Multiple failed login attempts followed by successful access
- Unexpected configuration changes
Network Indicators:
- Unusual traffic to router management ports (typically 80, 443, 8080)
- Suspicious packets containing shell metacharacters or command sequences
- Outbound connections from router to unknown IPs
SIEM Query:
source="router_logs" AND ("cmd" OR "exec" OR "system") AND NOT user="admin"