CVE-2024-57045
📋 TL;DR
This critical vulnerability in D-Link DIR-859 routers allows attackers to bypass authentication by forging POST requests to the /getcfg.php page, potentially exposing administrative credentials. Attackers can gain full control of affected routers. All users of DIR-859 routers with firmware version A3 1.05 or earlier are affected.
💻 Affected Systems
- D-Link DIR-859 Wireless AC1750 Dual Band Gigabit Router
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete router compromise allowing attacker to intercept all network traffic, install malware, pivot to internal networks, and permanently backdoor the device.
Likely Case
Attacker gains administrative access to router, changes DNS settings to redirect traffic, steals credentials from connected devices, and disables security features.
If Mitigated
Limited impact if router is behind firewall with strict inbound rules, though internal network exposure remains possible.
🎯 Exploit Status
Simple HTTP POST request manipulation required. No authentication needed. Public GitHub repository contains exploitation details.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check D-Link website for latest firmware (likely version A3 1.06 or newer)
Vendor Advisory: https://www.dlink.com/en/security-bulletin/
Restart Required: Yes
Instructions:
1. Visit D-Link support website. 2. Download latest firmware for DIR-859. 3. Log into router admin interface. 4. Navigate to System > Firmware Update. 5. Upload and install new firmware. 6. Router will reboot automatically.
🔧 Temporary Workarounds
Disable Remote Management
allPrevents external access to router web interface
Change Default Admin Credentials
allWhile this doesn't fix the bypass, it limits damage if credentials are exposed
🧯 If You Can't Patch
- Replace router with supported model
- Place router behind dedicated firewall with strict inbound rules blocking port 80/443
🔍 How to Verify
Check if Vulnerable:
Check router firmware version in admin interface under System > Firmware. If version is A3 1.05 or earlier, device is vulnerable.Check Version:
curl -s http://router-ip/ | grep -i firmware or check web interfaceVerify Fix Applied:
After updating, verify firmware version shows as newer than A3 1.05. Test authentication bypass by attempting to access /getcfg.php with forged POST request.📡 Detection & Monitoring
Log Indicators:
- Multiple POST requests to /getcfg.php
- Failed login attempts followed by successful admin access
- Unusual admin login from unexpected IP addresses
Network Indicators:
- HTTP POST requests to /getcfg.php with crafted parameters
- Traffic to router on port 80/443 from external IPs
SIEM Query:
source="router-logs" AND (url="/getcfg.php" OR (event="login" AND result="success" AND source_ip NOT IN [trusted_ips]))