CVE-2025-29844
📋 TL;DR
This vulnerability allows remote authenticated users to read file metadata and path information through a FileStation CGI component. It affects Synology NAS devices running vulnerable versions of DSM. Attackers need valid credentials to exploit this information disclosure flaw.
💻 Affected Systems
- Synology DiskStation Manager (DSM)
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Attackers could map internal file structures, identify sensitive file locations, and use this information for further attacks like targeted data exfiltration or privilege escalation.
Likely Case
Authenticated users (including compromised accounts) can enumerate file paths and metadata, potentially discovering sensitive files or system information they shouldn't have access to.
If Mitigated
With proper access controls and network segmentation, impact is limited to information disclosure within the authenticated user's permitted scope.
🎯 Exploit Status
Exploitation requires valid user credentials. The vulnerability is in a CGI component of FileStation.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: DSM 7.2-69057 Update 3 or later, DSM 7.1-42661 Update 10 or later
Vendor Advisory: https://www.synology.com/en-global/security/advisory/Synology_SA_25_04
Restart Required: No
Instructions:
1. Log into DSM as administrator. 2. Go to Control Panel > Update & Restore. 3. Click 'Download DSM Update' if available. 4. Click 'Install Now' when update appears. 5. Follow on-screen instructions.
🔧 Temporary Workarounds
Disable FileStation
allTemporarily disable FileStation if not required, which removes the vulnerable component.
Restrict Network Access
allLimit access to DSM management interface to trusted networks only.
🧯 If You Can't Patch
- Implement strict access controls and monitor for unusual file enumeration activities.
- Segment NAS devices from critical networks and implement network-level restrictions.
🔍 How to Verify
Check if Vulnerable:
Check DSM version in Control Panel > Info Center > DSM Version. Compare against affected versions.Check Version:
ssh admin@nas_ip 'cat /etc.defaults/VERSION'Verify Fix Applied:
Verify DSM version is 7.2-69057 Update 3 or later, or 7.1-42661 Update 10 or later.📡 Detection & Monitoring
Log Indicators:
- Unusual FileStation CGI requests, repeated file metadata queries from single users
Network Indicators:
- Multiple requests to /webapi/entry.cgi with file enumeration parameters
SIEM Query:
source="synology" AND uri_path="/webapi/entry.cgi" AND (query="api=SYNO.FileStation.*" OR query="method=*list*")