CVE-2023-52943
📋 TL;DR
This vulnerability allows authenticated users to perform unauthorized actions on the alerting function in Synology Surveillance Station. Attackers with valid credentials can manipulate alert settings beyond their intended permissions. This affects all Synology Surveillance Station installations running vulnerable versions.
💻 Affected Systems
- Synology Surveillance Station
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
An authenticated attacker could disable or modify critical security alerts, potentially allowing undetected surveillance system compromise or data exfiltration.
Likely Case
Authorized users exceeding their permissions to modify alert settings, potentially disrupting monitoring operations or creating false alerts.
If Mitigated
Limited impact with proper access controls and monitoring, as exploitation requires authentication and only affects alerting functions.
🎯 Exploit Status
Exploitation requires valid user credentials. The specific vectors are not disclosed in the public advisory.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 9.2.0-11289 or 9.2.0-9289 and later
Vendor Advisory: https://www.synology.com/en-global/security/advisory/Synology_SA_24_04
Restart Required: Yes
Instructions:
1. Log into DSM as administrator. 2. Open Package Center. 3. Find Surveillance Station. 4. Click Update if available. 5. Alternatively, download from Synology website and manually install. 6. Restart Surveillance Station service.
🔧 Temporary Workarounds
Restrict Access to Surveillance Station
allLimit which users can access Surveillance Station web interface to reduce attack surface.
Implement Network Segmentation
allIsolate Surveillance Station from general network access, especially internet exposure.
🧯 If You Can't Patch
- Implement strict access controls and review user permissions regularly
- Monitor alert settings changes and implement alerting for unauthorized modifications
🔍 How to Verify
Check if Vulnerable:
Check Surveillance Station version in Package Center or via SSH: sudo synopkg version SurveillanceStationCheck Version:
sudo synopkg version SurveillanceStationVerify Fix Applied:
Verify version is 9.2.0-11289 or higher, or 9.2.0-9289 or higher. Check no unauthorized alert modifications occur.📡 Detection & Monitoring
Log Indicators:
- Unauthorized alert setting modifications in Surveillance Station logs
- User actions on Alert.Setting webapi outside normal patterns
Network Indicators:
- HTTP requests to /webapi/entry.cgi with Alert.Setting parameters from unauthorized users
SIEM Query:
source="surveillance_station" AND (event="alert_setting_modification" OR api="Alert.Setting") AND user NOT IN ["admin", "authorized_users"]