CVE-2024-7849
📋 TL;DR
A critical buffer overflow vulnerability in D-Link NAS devices allows remote attackers to execute arbitrary code by manipulating the 'current_path' argument in the cgi_create_album function. This affects multiple end-of-life D-Link NAS models that are no longer supported by the vendor. Attackers can exploit this remotely without authentication to potentially take full control of affected devices.
💻 Affected Systems
- D-Link DNS-120
- DNR-202L
- DNS-315L
- DNS-320
- DNS-320L
- DNS-320LW
- DNS-321
- DNR-322L
- DNS-323
- DNS-325
- DNS-326
- DNS-327L
- DNR-326
- DNS-340L
- DNS-343
- DNS-345
- DNS-726-4
- DNS-1100-4
- DNS-1200-05
- DNS-1550-04
⚠️ Manual Verification Required
This CVE does not have specific version information in our database, so automatic vulnerability detection cannot determine if your system is affected.
Why? The CVE database entry doesn't specify which versions are vulnerable (no version ranges provided by the vendor/NVD).
🔒 Custom verification scripts are available for registered users. Sign up free to download automated test scripts.
- Review the CVE details at NVD
- Check vendor security advisories for your specific version
- Test if the vulnerability is exploitable in your environment
- Consider updating to the latest version as a precaution
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete device compromise, data theft, ransomware deployment, or use as a botnet node.
Likely Case
Remote code execution allowing attackers to install malware, steal data, or pivot to other network resources.
If Mitigated
Limited impact if devices are isolated in protected network segments with strict access controls.
🎯 Exploit Status
Public exploit code is available on GitHub. The vulnerability requires no authentication and has straightforward exploitation.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: None
Vendor Advisory: https://supportannouncement.us.dlink.com/security/publication.aspx?name=SAP10383
Restart Required: No
Instructions:
No official patch exists. D-Link recommends retiring and replacing all affected devices as they are end-of-life.
🔧 Temporary Workarounds
Block CGI Access
linuxBlock access to the vulnerable CGI endpoint at the network level
iptables -A INPUT -p tcp --dport 80 -m string --string "/cgi-bin/photocenter_mgr.cgi" --algo bm -j DROP
iptables -A INPUT -p tcp --dport 443 -m string --string "/cgi-bin/photocenter_mgr.cgi" --algo bm -j DROP
Disable Web Interface
allDisable the web management interface if not required
Check device admin interface for web service disable option
🧯 If You Can't Patch
- Immediately remove affected devices from internet-facing positions and place behind strict firewalls
- Segment affected devices in isolated VLANs with no access to critical network resources
🔍 How to Verify
Check if Vulnerable:
Check if your device model is in the affected products list and if it's running firmware dated before August 14, 2024Check Version:
Check device web interface or use: curl -s http://device-ip/ | grep -i firmwareVerify Fix Applied:
No fix exists to verify. Verify workarounds by testing that /cgi-bin/photocenter_mgr.cgi is inaccessible📡 Detection & Monitoring
Log Indicators:
- HTTP requests to /cgi-bin/photocenter_mgr.cgi with long current_path parameters
- Unusual process execution or file creation on NAS devices
Network Indicators:
- HTTP POST requests to photocenter_mgr.cgi with buffer overflow patterns
- Unusual outbound connections from NAS devices
SIEM Query:
source="nas_logs" AND uri="/cgi-bin/photocenter_mgr.cgi" AND (current_path.length>100 OR status=500)