CVE-2023-51947
📋 TL;DR
This vulnerability allows remote attackers to read and modify data without authentication due to improper access control in the nasSvr.php component of actidata actiNAS SL 2U-8 RDX. It affects organizations using this specific network-attached storage device with vulnerable firmware. Attackers can exploit this to access sensitive stored data.
💻 Affected Systems
- actidata actiNAS SL 2U-8 RDX
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of all data stored on the NAS device, including potential data destruction, ransomware deployment, or use as an internal pivot point for further network attacks.
Likely Case
Unauthorized access to sensitive files and data stored on the NAS, potential data exfiltration, and modification or deletion of critical business data.
If Mitigated
Limited impact if device is isolated behind strong network segmentation and access controls, though vulnerability still exists at the device level.
🎯 Exploit Status
Public proof-of-concept code is available on GitHub, making exploitation trivial for attackers with basic technical skills.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: https://www.actidata.com/index.php/de-de/actinas-plus-sl-2u-8-rdx
Restart Required: No
Instructions:
Check vendor website for security updates. If no patch is available, implement workarounds immediately.
🔧 Temporary Workarounds
Network Segmentation
allIsolate the NAS device from untrusted networks and restrict access to authorized IP addresses only.
Configure firewall rules to block all external access to NAS management interface
Implement VLAN segmentation to isolate NAS from general network
Access Control Lists
linuxImplement strict network access controls to limit which systems can communicate with the NAS device.
iptables -A INPUT -s [TRUSTED_IP] -p tcp --dport [NAS_PORT] -j ACCEPT
iptables -A INPUT -p tcp --dport [NAS_PORT] -j DROP
🧯 If You Can't Patch
- Immediately disconnect the device from any internet-facing networks
- Implement strict network segmentation and monitor all traffic to/from the NAS device
🔍 How to Verify
Check if Vulnerable:
Check if nasSvr.php is accessible without authentication by attempting to access the component via HTTP requests. Monitor for unauthorized access attempts in logs.Check Version:
Check device web interface or SSH into device and check firmware version in system settingsVerify Fix Applied:
Test that nasSvr.php now requires proper authentication and access controls are functioning. Verify network segmentation is preventing unauthorized access.📡 Detection & Monitoring
Log Indicators:
- Unauthenticated access attempts to nasSvr.php
- Unusual file access patterns from unexpected IP addresses
- Failed authentication attempts followed by successful data access
Network Indicators:
- HTTP requests to nasSvr.php without authentication headers
- Unusual data transfer volumes from NAS device
- Traffic from NAS to unexpected external IPs
SIEM Query:
source="nas_logs" AND (uri="/nasSvr.php" AND NOT auth_success="true") OR (source_ip NOT IN [authorized_ips] AND dest_ip=[NAS_IP])🔗 References
- http://actinas-plus-sl-2u-8-rdx.com
- https://github.com/saw-your-packet/CVEs/blob/main/CVE-2023-51947/README.md
- https://www.actidata.com/index.php/de-de/actinas-plus-sl-2u-8-rdx
- http://actinas-plus-sl-2u-8-rdx.com
- https://github.com/saw-your-packet/CVEs/blob/main/CVE-2023-51947/README.md
- https://www.actidata.com/index.php/de-de/actinas-plus-sl-2u-8-rdx
