CVE-2024-45539
📋 TL;DR
An out-of-bounds write vulnerability in CGI components of Synology DiskStation Manager (DSM) and Unified Controller (DSMUC) allows remote attackers to cause denial-of-service attacks. This affects Synology NAS devices running vulnerable versions of DSM/DSMUC. The vulnerability can be exploited without authentication via unspecified vectors.
💻 Affected Systems
- Synology DiskStation Manager (DSM)
- Synology Unified Controller (DSMUC)
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Remote unauthenticated attackers could crash critical system services, causing complete service disruption and potential data corruption.
Likely Case
Remote attackers cause denial-of-service by crashing CGI components, disrupting web interface and management functionality.
If Mitigated
With proper network segmentation and access controls, only authorized internal users could potentially exploit, limiting impact.
🎯 Exploit Status
Vendor advisory states 'remote attackers' without specifying authentication requirements, suggesting unauthenticated access. No public exploit details available.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: DSM 7.2.1-69057-2 or later, DSM 7.2.2-72806 or later; DSMUC 3.1.4-23079 or later
Vendor Advisory: https://www.synology.com/en-global/security/advisory/Synology_SA_24_27
Restart Required: Yes
Instructions:
1. Log into DSM web interface as administrator. 2. Go to Control Panel > Update & Restore. 3. Click 'Update' and follow prompts. 4. System will restart automatically after update.
🔧 Temporary Workarounds
Network Segmentation
allRestrict access to DSM web interface to trusted internal networks only
Firewall Rules
allBlock external access to DSM web ports (default 5000/5001)
🧯 If You Can't Patch
- Isolate affected systems from internet access
- Implement strict network access controls to limit exposure
🔍 How to Verify
Check if Vulnerable:
Check DSM version in Control Panel > Info Center > DSM versionCheck Version:
ssh admin@nas_ip 'cat /etc.defaults/VERSION'Verify Fix Applied:
Verify DSM version is 7.2.1-69057-2 or later, or 7.2.2-72806 or later; DSMUC version is 3.1.4-23079 or later📡 Detection & Monitoring
Log Indicators:
- CGI process crashes in /var/log/messages
- Web service restarts
- Unusual HTTP requests to CGI endpoints
Network Indicators:
- Multiple HTTP requests to CGI endpoints from single source
- Abnormal traffic patterns to DSM web ports
SIEM Query:
source="synology" AND (process="cgi" OR http_uri="*.cgi") AND (event="crash" OR event="restart")