CVE-2024-8887
📋 TL;DR
CVE-2024-8887 is an authentication bypass vulnerability in CIRCUTOR Q-SMT firmware that allows attackers to access all web interface functionalities without credentials. This affects CIRCUTOR Q-SMT devices running firmware version 1.0.4. Attackers can perform denial of service attacks and potentially manipulate device operations.
💻 Affected Systems
- CIRCUTOR Q-SMT
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete device compromise allowing attackers to disable critical power monitoring functions, manipulate settings, and cause sustained service disruption affecting connected systems.
Likely Case
Attackers bypass authentication to access web interface, modify device configurations, and trigger denial of service conditions disrupting monitoring operations.
If Mitigated
With proper network segmentation and access controls, impact limited to isolated network segments with minimal operational disruption.
🎯 Exploit Status
Authentication bypass vulnerabilities typically have low exploitation complexity once the bypass method is identified.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Not specified in available information
Vendor Advisory: https://www.incibe.es/en/incibe-cert/notices/aviso-sci/multiple-vulnerabilities-circutor-products
Restart Required: Yes
Instructions:
1. Contact CIRCUTOR for firmware updates. 2. Download updated firmware from vendor portal. 3. Upload firmware via web interface. 4. Reboot device to apply changes.
🔧 Temporary Workarounds
Network Segmentation
allIsolate Q-SMT devices in separate VLAN with strict firewall rules limiting access to authorized management systems only.
Web Interface Restriction
allBlock external access to web interface ports (typically 80/443) at network perimeter and restrict internal access to specific IP addresses.
🧯 If You Can't Patch
- Implement strict network access controls allowing only authorized management systems to communicate with Q-SMT devices
- Monitor network traffic to Q-SMT devices for unauthorized access attempts and authentication bypass patterns
🔍 How to Verify
Check if Vulnerable:
Check firmware version via web interface or device management console. If version is 1.0.4, device is vulnerable.Check Version:
Check via web interface at http(s)://[device-ip]/ or consult device documentation for CLI version checkVerify Fix Applied:
After firmware update, verify version is no longer 1.0.4 and test authentication bypass attempts fail.📡 Detection & Monitoring
Log Indicators:
- Failed authentication attempts followed by successful access without valid credentials
- Multiple login attempts from single source with varying parameters
Network Indicators:
- HTTP requests to login endpoints with unusual parameters
- Traffic to web interface from unauthorized IP addresses
SIEM Query:
source_ip=[Q-SMT-IP] AND (http_method=POST AND uri CONTAINS 'login' AND response_code=200) WITHOUT preceding successful auth