CVE-2024-7832
📋 TL;DR
This critical buffer overflow vulnerability in D-Link NAS devices allows remote attackers to execute arbitrary code by manipulating the 'user' parameter in the photocenter_mgr.cgi CGI script. It affects multiple end-of-life D-Link NAS models that are no longer supported by the vendor. Successful exploitation could lead to complete system compromise.
💻 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
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to full system compromise, data theft, ransomware deployment, or device becoming part of a botnet
Likely Case
Remote code execution allowing attacker to gain shell access, install malware, or pivot to internal networks
If Mitigated
Attack blocked at network perimeter or device isolated from internet, limiting impact to denial of service
🎯 Exploit Status
Public exploit code available on GitHub. Attack requires sending crafted HTTP request to /cgi-bin/photocenter_mgr.cgi endpoint.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: None available
Vendor Advisory: https://supportannouncement.us.dlink.com/security/publication.aspx?name=SAP10383
Restart Required: No
Instructions:
No official patch available. Vendor recommends retiring and replacing all affected devices as they are end-of-life.
🔧 Temporary Workarounds
Block CGI endpoint at firewall
linuxBlock access to the vulnerable CGI endpoint to prevent exploitation
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 networks
- Segment affected devices on isolated VLANs with strict firewall rules
🔍 How to Verify
Check if Vulnerable:
Check if device model is in affected list and has web interface accessible. Test with curl: curl -X POST 'http://device-ip/cgi-bin/photocenter_mgr.cgi' --data 'user=AAAAAAAA...' (long string)Check Version:
Check device web interface admin page or use nmap: nmap -sV -p 80,443 device-ipVerify Fix Applied:
Verify device is no longer accessible from untrusted networks and CGI endpoint returns error or is blocked📡 Detection & Monitoring
Log Indicators:
- HTTP POST requests to /cgi-bin/photocenter_mgr.cgi with unusually long user parameter
- Device crash or restart logs
- Unusual process execution from web server
Network Indicators:
- HTTP traffic to photocenter_mgr.cgi with payload patterns
- Outbound connections from NAS device to unknown IPs post-exploit
SIEM Query:
source="web_logs" AND uri="/cgi-bin/photocenter_mgr.cgi" AND method="POST" AND (user.length > 100 OR contains(user, "AAAAAAAA"))