CVE-2024-57440
📋 TL;DR
This vulnerability allows remote attackers to execute arbitrary code on affected D-Link DSL-3788 routers via a buffer overflow in the web interface's COMM_MAKECustomMsg function. Attackers can exploit this to gain full control of the device. Only users of the specific D-Link DSL-3788 revA1 model with firmware version 1.01R1B036_EU_EN are affected.
💻 Affected Systems
- D-Link DSL-3788
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete device compromise leading to persistent backdoor installation, network traffic interception, credential theft, and lateral movement to other devices on the network.
Likely Case
Remote code execution allowing attackers to modify router settings, intercept traffic, or use the device as part of a botnet.
If Mitigated
Limited impact if the web interface is not exposed to untrusted networks and proper network segmentation is in place.
🎯 Exploit Status
Exploitation requires sending specially crafted requests to the webproc CGI endpoint. The vulnerability is in a specific function that processes custom messages.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check D-Link support for latest firmware
Vendor Advisory: https://supportannouncement.us.dlink.com/security/publication.aspx?name=SAP10418
Restart Required: Yes
Instructions:
1. Visit D-Link support website 2. Download latest firmware for DSL-3788 revA1 3. Log into router admin interface 4. Navigate to firmware update section 5. Upload and apply new firmware 6. Wait for router to reboot
🔧 Temporary Workarounds
Disable Remote Management
allPrevent external access to the router's web interface
Network Segmentation
allIsolate router management interface from untrusted networks
🧯 If You Can't Patch
- Replace the vulnerable device with a supported model
- Implement strict firewall rules to block access to router web interface from untrusted sources
🔍 How to Verify
Check if Vulnerable:
Check router firmware version in admin interface under System > FirmwareCheck Version:
Login to router web interface and check firmware version in system settingsVerify Fix Applied:
Verify firmware version has been updated to a version newer than 1.01R1B036_EU_EN📡 Detection & Monitoring
Log Indicators:
- Multiple failed requests to /cgi-bin/webproc endpoint
- Unusual POST requests to router management interface
Network Indicators:
- Unusual traffic patterns to router management port (typically 80/443)
- Exploit attempts targeting COMM_MAKECustomMsg function
SIEM Query:
source="router_logs" AND (uri="/cgi-bin/webproc" OR message="COMM_MAKECustomMsg")