CVE-2023-0776
📋 TL;DR
This vulnerability allows remote attackers to execute arbitrary shell commands with root privileges on affected Baicells cellular base stations via HTTP command injection. The exploit works without authentication, enabling complete device takeover. Organizations using Baicells Nova 436Q, Nova 430E, Nova 430I, or Neutrino 430 LTE TDD eNodeB devices with firmware through QRTB 2.12.7 are affected.
💻 Affected Systems
- Baicells Nova 436Q
- Baicells Nova 430E
- Baicells Nova 430I
- Baicells Neutrino 430 LTE TDD eNodeB
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of cellular infrastructure, allowing attackers to intercept/modify communications, disrupt service, pivot to internal networks, or install persistent backdoors.
Likely Case
Device takeover leading to service disruption, data interception, or use as a foothold for further network attacks.
If Mitigated
Limited impact if devices are isolated in secure network segments with strict access controls and monitored for anomalous HTTP traffic.
🎯 Exploit Status
Third-party validation confirms exploitability with specific reproduction steps available. Pre-login execution with root permissions makes exploitation straightforward.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check vendor for firmware updates beyond QRTB 2.12.7
Vendor Advisory: https://baicells.com/Service/Firmware
Restart Required: Yes
Instructions:
1. Check current firmware version. 2. Download latest firmware from Baicells support portal. 3. Upload and apply firmware update via device management interface. 4. Reboot device to complete installation.
🔧 Temporary Workarounds
Network Segmentation
allIsolate affected devices in dedicated VLANs with strict firewall rules limiting HTTP access to management interfaces.
Access Control Lists
allImplement IP-based restrictions to allow only authorized management systems to communicate with device HTTP interfaces.
🧯 If You Can't Patch
- Deploy network-based intrusion prevention systems (IPS) to detect and block HTTP command injection attempts.
- Implement strict outbound filtering to prevent compromised devices from establishing command and control connections.
🔍 How to Verify
Check if Vulnerable:
Check device firmware version via web interface or CLI. If version is QRTB 2.12.7 or earlier, device is vulnerable.Check Version:
Check via web interface at /cgi-bin/luci or similar management pages for firmware version information.Verify Fix Applied:
Confirm firmware version is updated beyond QRTB 2.12.7 and test HTTP interfaces for command injection vulnerabilities.📡 Detection & Monitoring
Log Indicators:
- Unusual HTTP requests to device management interfaces
- Suspicious command strings in HTTP parameters
- Multiple failed login attempts followed by command execution
Network Indicators:
- HTTP traffic to device ports containing shell metacharacters or command injection patterns
- Unexpected outbound connections from base stations
SIEM Query:
source="baicells-device" AND (http.uri="*cgi-bin*" OR http.uri="*luci*") AND (http.query="*;*" OR http.query="*|*" OR http.query="*`*" OR http.query="*$(*")