CVE-2025-29846
📋 TL;DR
This vulnerability in Synology's portenable CGI allows authenticated remote users to query the status of installed packages. This information disclosure could help attackers map the system for further exploitation. Affects Synology NAS devices with specific software versions.
💻 Affected Systems
- Synology NAS devices
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Attackers could enumerate installed packages to identify vulnerable software versions, then chain with other exploits for privilege escalation or remote code execution.
Likely Case
Authenticated attackers can gather system intelligence about installed packages, potentially identifying vulnerable components for targeted attacks.
If Mitigated
With proper authentication controls and network segmentation, impact is limited to information disclosure within authorized user scope.
🎯 Exploit Status
Exploitation requires authenticated access to the CGI endpoint
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check Synology SA_25_04 for specific patched versions
Vendor Advisory: https://www.synology.com/en-global/security/advisory/Synology_SA_25_04
Restart Required: Yes
Instructions:
1. Log into DSM web interface. 2. Go to Control Panel > Update & Restore. 3. Check for updates. 4. Apply available security updates. 5. Restart device if required.
🔧 Temporary Workarounds
Restrict CGI access
linuxBlock access to portenable CGI endpoint via firewall or web server configuration
iptables -A INPUT -p tcp --dport [web-port] -m string --string "portenable" --algo bm -j DROP
Network segmentation
allRestrict Synology device access to trusted networks only
🧯 If You Can't Patch
- Implement strict access controls and multi-factor authentication for all Synology user accounts
- Monitor for unusual authentication attempts and CGI endpoint access patterns
🔍 How to Verify
Check if Vulnerable:
Check DSM version in Control Panel > Info Center > DSM versionCheck Version:
cat /etc.defaults/VERSION | grep productversionVerify Fix Applied:
Verify DSM version matches patched versions listed in Synology SA_25_04📡 Detection & Monitoring
Log Indicators:
- HTTP requests to /cgi-bin/portenable endpoint
- Multiple failed authentication attempts followed by successful login
Network Indicators:
- HTTP POST requests to CGI endpoints with package query parameters
- Unusual authentication patterns from external IPs
SIEM Query:
source="synology" AND (uri="/cgi-bin/portenable" OR user_agent CONTAINS "package query")