CVE-2023-52950
📋 TL;DR
This vulnerability allows attackers on the same network segment to intercept unencrypted login credentials for Synology Active Backup for Business Agent. It affects organizations using vulnerable versions of this backup software where attackers have adjacent network access.
💻 Affected Systems
- Synology Active Backup for Business Agent
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Attackers capture administrative credentials, gain unauthorized access to backup systems, potentially compromising sensitive backup data or using credentials for lateral movement.
Likely Case
Attackers capture user credentials for the backup agent, potentially accessing backup data or using credentials for further attacks within the network.
If Mitigated
With network segmentation and monitoring, impact is limited to credential exposure on isolated backup networks.
🎯 Exploit Status
Attack requires network sniffing capability on same segment as vulnerable agent during authentication. No authentication needed to intercept traffic.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 2.7.0-3221 and later
Vendor Advisory: https://www.synology.com/en-global/security/advisory/Synology_SA_24_11
Restart Required: Yes
Instructions:
1. Open Synology Active Backup for Business console. 2. Navigate to Agent Management. 3. Select all agents. 4. Click 'Update Agent' to deploy version 2.7.0-3221 or later. 5. Restart affected systems after update.
🔧 Temporary Workarounds
Network Segmentation
allIsolate backup agent traffic to dedicated VLAN with strict access controls
VPN for Remote Agents
allRequire VPN for any remote backup agents to encrypt all traffic
🧯 If You Can't Patch
- Segment backup network from general corporate network
- Implement network monitoring for unencrypted authentication attempts to backup systems
🔍 How to Verify
Check if Vulnerable:
Check agent version in Synology Active Backup console under Agent Management or run 'synoabagent --version' on client systemsCheck Version:
synoabagent --versionVerify Fix Applied:
Confirm agent version is 2.7.0-3221 or higher and test login while monitoring network traffic for encrypted authentication📡 Detection & Monitoring
Log Indicators:
- Failed login attempts from unexpected locations
- Multiple authentication attempts in short time
Network Indicators:
- Unencrypted authentication traffic to backup agent ports
- ARP spoofing or unusual network sniffing activity
SIEM Query:
source="network_traffic" AND dest_port IN (5510, 5511) AND protocol="TCP" AND payload_contains("login") AND NOT tls_version EXISTS