CVE-2023-6263
📋 TL;DR
This vulnerability allows attackers to spoof legitimate VMS servers in Network Optix NxCloud, enabling them to intercept authorization headers from legitimate users when they connect to the fake server. This affects all users of NxCloud versions before 23.1.0.40440, potentially compromising authentication credentials and enabling further attacks.
💻 Affected Systems
- Network Optix NxCloud
📦 What is this software?
Nxcloud by Networkoptix
⚠️ Risk & Real-World Impact
Worst Case
Attackers gain full access to user accounts, sensitive video surveillance data, and can pivot to internal networks using stolen credentials.
Likely Case
Authorization tokens are intercepted, allowing unauthorized access to video streams and system controls.
If Mitigated
Limited impact with proper network segmentation and monitoring, but authentication bypass remains possible.
🎯 Exploit Status
Exploitation requires setting up a fake VMS server with identical identification to a legitimate one, but no authentication is needed to initiate the attack.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 23.1.0.40440 and later
Vendor Advisory: https://networkoptix.atlassian.net/wiki/spaces/CHS/blog/2023/09/22/3074195467/vulnerability+2023-09-21+-+Server+Spoofing
Restart Required: Yes
Instructions:
1. Download NxCloud version 23.1.0.40440 or later from official sources. 2. Backup current configuration. 3. Stop NxCloud service. 4. Install the updated version. 5. Restart NxCloud service. 6. Verify functionality.
🔧 Temporary Workarounds
Network Segmentation
allIsolate NxCloud servers and clients to prevent unauthorized network access.
Certificate Pinning
allImplement certificate validation to prevent connections to untrusted servers.
🧯 If You Can't Patch
- Implement strict network access controls to limit which servers clients can connect to.
- Monitor network traffic for unusual connections to non-standard server addresses.
🔍 How to Verify
Check if Vulnerable:
Check NxCloud version via admin interface or configuration files. If version is below 23.1.0.40440, system is vulnerable.Check Version:
Check NxCloud admin interface or configuration files for version information.Verify Fix Applied:
Confirm NxCloud version is 23.1.0.40440 or higher and test that clients only connect to authorized servers.📡 Detection & Monitoring
Log Indicators:
- Failed authentication attempts from unexpected IPs
- Multiple connection attempts to same server ID from different locations
Network Indicators:
- Unusual DNS queries for VMS servers
- Traffic to non-standard ports or IPs for NxCloud services
SIEM Query:
source="nxcloud" AND (event_type="connection_failed" OR event_type="auth_failure") | stats count by src_ip