CVE-2025-2848
📋 TL;DR
This vulnerability in Synology Mail Server allows authenticated remote attackers to modify non-sensitive settings and disable certain non-critical functions. It affects organizations running vulnerable versions of Synology Mail Server with authenticated user access. The impact is limited to configuration manipulation rather than data theft or system compromise.
💻 Affected Systems
- Synology Mail Server
📦 What is this software?
Mail Server by Synology
Mail Server by Synology
⚠️ Risk & Real-World Impact
Worst Case
An attacker could disable mail server functions, disrupt email services, or modify settings to enable further attacks through misconfiguration.
Likely Case
Authenticated users could alter mail server settings, potentially causing service disruption or configuration inconsistencies.
If Mitigated
With proper access controls and monitoring, impact would be limited to minor configuration changes that can be quickly detected and reverted.
🎯 Exploit Status
Exploitation requires authenticated access, making it accessible to authorized users or attackers who have compromised valid credentials.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 7.1.1-50015 and later
Vendor Advisory: https://www.synology.com/en-global/security/advisory/Synology_SA_25_05
Restart Required: Yes
Instructions:
1. Log into DSM as administrator. 2. Open Package Center. 3. Find Synology Mail Server. 4. Click Update if available. 5. Alternatively, download the latest version from Synology's website and manually install. 6. Restart the mail server service.
🔧 Temporary Workarounds
Restrict User Access
allLimit administrative access to mail server settings to only necessary personnel.
Implement Network Segmentation
allRestrict access to the mail server administration interface to trusted networks only.
🧯 If You Can't Patch
- Implement strict access controls and monitor for unauthorized configuration changes.
- Regularly audit mail server settings and maintain backups of known-good configurations.
🔍 How to Verify
Check if Vulnerable:
Check Synology Mail Server version in Package Center or via SSH: synopkg version MailServerCheck Version:
synopkg version MailServerVerify Fix Applied:
Confirm version is 7.1.1-50015 or later using the same command.📡 Detection & Monitoring
Log Indicators:
- Unexpected configuration changes in mail server logs
- Authentication logs showing unusual user access patterns to mail admin interface
Network Indicators:
- Unusual API calls to mail server configuration endpoints from unexpected sources
SIEM Query:
source="synology_mail" AND (event="configuration_change" OR event="setting_modify")