CVE-2013-7052
📋 TL;DR
This vulnerability in D-Link DIR-100 routers allows attackers to bypass authentication via the cliget.cgi script, potentially gaining unauthorized access to the device's administrative interface. It affects D-Link DIR-100 routers running firmware version 4.03B07. Attackers can exploit this remotely without authentication.
💻 Affected Systems
- D-Link DIR-100
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of the router allowing attackers to reconfigure network settings, intercept traffic, install backdoors, or use the device as a pivot point into the internal network.
Likely Case
Unauthorized access to router administration leading to DNS hijacking, network monitoring, or credential theft from connected devices.
If Mitigated
Limited impact if router is behind firewall with restricted WAN access, though internal attackers could still exploit.
🎯 Exploit Status
Simple HTTP request manipulation can trigger the vulnerability. Multiple public exploit scripts exist.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: None available
Vendor Advisory: No official vendor advisory found
Restart Required: No
Instructions:
No official patch exists. Consider upgrading to newer router models or applying workarounds.
🔧 Temporary Workarounds
Disable Remote Administration
allPrevent external access to router web interface
Access router admin > Advanced > Remote Management > Disable
Change Default Admin Credentials
allUse strong unique credentials for router administration
Access router admin > Tools > Admin > Set new username/password
Restrict Web Interface Access
allLimit which IPs can access the admin interface
Access router admin > Advanced > Access Control > Add allowed IPs
🧯 If You Can't Patch
- Replace affected router with newer model that receives security updates
- Place router behind firewall with strict inbound rules blocking port 80/443 from untrusted networks
🔍 How to Verify
Check if Vulnerable:
Attempt to access http://[router-ip]/cliget.cgi?currentsetting.htm without authentication. If it returns configuration data, the device is vulnerable.Check Version:
Check router web interface login page or admin status page for firmware versionVerify Fix Applied:
After applying workarounds, verify remote administration is disabled and test the exploit URL returns authentication required.📡 Detection & Monitoring
Log Indicators:
- HTTP requests to /cliget.cgi with parameter currentsetting.htm from unauthorized IPs
- Failed authentication attempts followed by successful configuration access
Network Indicators:
- HTTP GET requests to router IP on port 80/443 with cliget.cgi path from external IPs
- Unusual configuration changes without corresponding admin logins
SIEM Query:
source_ip=external AND dest_port=80 AND uri_path="/cliget.cgi" AND uri_query="*currentsetting.htm*"🔗 References
- http://pigstarter.krebsco.de/report/2013-12-18_dir100.txt
- https://exchange.xforce.ibmcloud.com/vulnerabilities/90902
- https://www.securityfocus.com/bid/65290
- http://pigstarter.krebsco.de/report/2013-12-18_dir100.txt
- https://exchange.xforce.ibmcloud.com/vulnerabilities/90902
- https://www.securityfocus.com/bid/65290
