CVE-2022-34527
📋 TL;DR
This CVE describes a command injection vulnerability in D-Link DSL-3782 routers that allows attackers to execute arbitrary commands on the device. The vulnerability affects D-Link DSL-3782 routers running firmware version 1.03 and below. Attackers can exploit this to gain unauthorized access and control over affected routers.
💻 Affected Systems
- D-Link DSL-3782
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of the router allowing attackers to intercept all network traffic, install persistent backdoors, pivot to internal networks, and use the device for botnet activities.
Likely Case
Remote code execution leading to router compromise, credential theft, DNS hijacking, and participation in DDoS attacks.
If Mitigated
Limited impact with proper network segmentation and firewall rules preventing external access to router management interfaces.
🎯 Exploit Status
Exploit requires access to the web management interface. Public proof-of-concept code is available in GitHub repositories.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: v1.04 or later
Vendor Advisory: https://www.dlink.com/en/security-bulletin/
Restart Required: Yes
Instructions:
1. Log into D-Link support portal. 2. Download firmware version 1.04 or later for DSL-3782. 3. Access router web interface. 4. Navigate to System Tools > Firmware Upgrade. 5. Upload and install the new firmware. 6. Reboot the router.
🔧 Temporary Workarounds
Disable WAN Management Access
allPrevent external access to router management interface
Access router web interface > Security > Remote Management > Disable
Change Default Credentials
allUse strong, unique credentials for router administration
Access router web interface > Management > Account > Change admin password
🧯 If You Can't Patch
- Isolate router on separate VLAN with strict firewall rules
- Implement network monitoring for suspicious traffic patterns from router
🔍 How to Verify
Check if Vulnerable:
Check firmware version in router web interface: System Tools > Firmware. If version is 1.03 or below, device is vulnerable.Check Version:
curl -s http://router-ip/version.cgi or check web interfaceVerify Fix Applied:
After patching, verify firmware version shows 1.04 or later in System Tools > Firmware.📡 Detection & Monitoring
Log Indicators:
- Unusual command execution in system logs
- Multiple failed login attempts followed by successful login
- Unexpected firmware modification attempts
Network Indicators:
- Unusual outbound connections from router
- DNS queries to suspicious domains
- Traffic patterns indicating command and control communication
SIEM Query:
source="router-logs" AND ("command injection" OR "unauthorized access" OR "firmware modified")