CVE-2024-28747: SmartSPS Auth Bypass Vulnerability

CVE-2024-28747 Overview

CVE-2024-28747 is a critical hardcoded credentials vulnerability affecting SmartSPS industrial control devices. An unauthenticated remote attacker can leverage hard-coded credentials embedded in the device firmware to gain unauthorized access with high privileges. This vulnerability represents a severe security flaw in industrial automation systems, as it allows complete device compromise without requiring any form of authentication.

Critical Impact

Remote attackers can gain complete control over SmartSPS devices using hard-coded credentials, potentially compromising industrial control systems and operational technology environments.

Affected Products

• SmartSPS industrial control devices
• Related programmable logic controller (PLC) systems
• Associated industrial automation components

Discovery Timeline

• 2024-07-09 - CVE-2024-28747 published to NVD
• 2024-11-21 - Last updated in NVD database

Technical Details for CVE-2024-28747

Vulnerability Analysis

This vulnerability falls under CWE-798 (Use of Hard-coded Credentials), a critical security weakness where authentication credentials are embedded directly in the device firmware or software. The hard-coded credentials provide network-accessible authentication that cannot be changed by end users, making all deployed devices equally vulnerable once the credentials are discovered.

The attack can be executed remotely over the network without requiring any prior authentication or user interaction. Successful exploitation grants attackers high-level privileges on the target device, enabling complete compromise of confidentiality, integrity, and availability of the affected system.

Root Cause

The root cause of this vulnerability is the presence of static, unchangeable credentials embedded within the SmartSPS device firmware. This design flaw is commonly introduced during development for debugging or maintenance purposes but was never removed before production deployment. Hard-coded credentials violate fundamental security principles by creating a single point of failure that affects all deployed instances of the device.

Attack Vector

The vulnerability is exploitable over the network (AV:N), requires low attack complexity (AC:L), and needs no privileges or user interaction to exploit. An attacker can remotely connect to the SmartSPS device and authenticate using the hard-coded credentials to gain administrative or elevated access.

The attack flow typically involves:

1. Network discovery of SmartSPS devices on target networks
2. Identification of available authentication interfaces (web, SSH, Telnet, or proprietary protocols)
3. Authentication using the known hard-coded credentials
4. Full device compromise with high-privilege access

For detailed technical information about this vulnerability, refer to the VDE Security Advisory VDE-2024-012.

Detection Methods for CVE-2024-28747

Indicators of Compromise

• Unexpected successful authentication attempts to SmartSPS devices from unknown or external IP addresses
• Multiple login events using the same credentials across different source IPs
• Unauthorized configuration changes or firmware modifications on SmartSPS devices
• Unusual network traffic patterns to industrial control system (ICS) networks

Detection Strategies

• Implement network monitoring to detect authentication attempts to SmartSPS devices from unauthorized sources
• Deploy industrial control system (ICS) intrusion detection systems capable of analyzing authentication traffic
• Establish baseline behavior for SmartSPS device communications and alert on deviations
• Monitor for credential-based authentication events in OT network logs

Monitoring Recommendations

• Deploy network segmentation between IT and OT networks with traffic inspection at boundaries
• Implement continuous monitoring of authentication logs on SmartSPS management interfaces
• Configure alerts for any external network access attempts to industrial control devices
• Utilize SentinelOne Singularity for endpoint detection and response on systems communicating with SmartSPS devices

How to Mitigate CVE-2024-28747

Immediate Actions Required

• Isolate affected SmartSPS devices from direct internet access immediately
• Implement strict network segmentation to limit access to SmartSPS devices to authorized systems only
• Deploy firewall rules restricting access to SmartSPS management interfaces to trusted IP addresses
• Review and audit all access logs for signs of prior compromise

Patch Information

Organizations should consult the VDE Security Advisory VDE-2024-012 for official patch and remediation guidance from the vendor. Apply any available firmware updates that address the hard-coded credentials issue as soon as they become available.

Workarounds

• Place all affected SmartSPS devices behind properly configured firewalls with strict access control lists
• Implement VPN requirements for any remote access to industrial control networks
• Deploy network-level authentication in front of SmartSPS devices using a jump server or bastion host
• Enable comprehensive logging and monitoring on all network paths to affected devices

# Example network isolation configuration
# Restrict SmartSPS device access to management VLAN only
# Replace with appropriate values for your environment

# iptables example - restrict access to SmartSPS management port
iptables -A INPUT -s 10.0.1.0/24 -d 192.168.100.10 -p tcp --dport 443 -j ACCEPT
iptables -A INPUT -d 192.168.100.10 -p tcp --dport 443 -j DROP

# Block external access to SmartSPS devices
iptables -A FORWARD -i eth0 -d 192.168.100.0/24 -j DROP