CVE-2023-30372
📋 TL;DR
This CVE describes a stack-based buffer overflow vulnerability in the 'xkjs_ver32' function of Tenda AC15 routers. Attackers can exploit this to execute arbitrary code with root privileges, potentially taking full control of affected devices. Users running Tenda AC15 routers with vulnerable firmware are affected.
💻 Affected Systems
- Tenda AC15
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution with root privileges leading to complete device compromise, persistent backdoor installation, and lateral movement into internal networks.
Likely Case
Router compromise allowing traffic interception, DNS hijacking, credential theft, and botnet recruitment.
If Mitigated
Limited impact if device is behind firewall with restricted inbound access and proper network segmentation.
🎯 Exploit Status
Multiple public GitHub repositories contain exploit code and detailed analysis. The vulnerability requires no authentication and has straightforward exploitation.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: Not available
Restart Required: Yes
Instructions:
1. Check Tenda official website for firmware updates. 2. If update available, download and verify checksum. 3. Access router admin interface. 4. Navigate to firmware upgrade section. 5. Upload new firmware file. 6. Wait for reboot and verify version.
🔧 Temporary Workarounds
Disable Remote Management
allPrevent external access to router administration interface
Network Segmentation
allIsolate router management interface to separate VLAN
🧯 If You Can't Patch
- Replace affected router with different model/brand
- Place router behind dedicated firewall with strict inbound rules
🔍 How to Verify
Check if Vulnerable:
Access router admin interface and check firmware version matches V15.03.05.19Check Version:
Check router web interface or use nmap -sV -p 80,443 [router_ip]Verify Fix Applied:
Check firmware version is different from V15.03.05.19 after update📡 Detection & Monitoring
Log Indicators:
- Unusual process execution
- Failed authentication attempts to router admin
- Unexpected firmware modification timestamps
Network Indicators:
- Unusual outbound connections from router
- DNS queries to suspicious domains
- Port scanning originating from router
SIEM Query:
source="router_logs" AND (event="firmware_change" OR event="admin_login_failed" OR process="xkjs_ver32")