CVE-2024-47138: Authentication Bypass Vulnerability

CVE-2024-47138 Overview

CVE-2024-47138 is a critical authentication bypass vulnerability affecting Industrial Control System (ICS) devices. The administrative interface listens by default on all network interfaces on a TCP port and does not require authentication when being accessed. This vulnerability allows unauthenticated remote attackers to gain full administrative control over affected systems.

Critical Impact
Unauthenticated remote attackers can access the administrative interface and potentially take complete control of the affected ICS devices, leading to unauthorized configuration changes, service disruption, or compromise of connected industrial systems.

Affected Products

Industrial Control Systems (see CISA ICS Advisory ICSA-24-326-07 for specific affected products)

Discovery Timeline

2024-11-22 - CVE CVE-2024-47138 published to NVD
2024-11-22 - Last updated in NVD database

Technical Details for CVE-2024-47138

Vulnerability Analysis

This vulnerability falls under CWE-306 (Missing Authentication for Critical Function), one of the most severe authentication flaws possible. The administrative interface of the affected ICS device is configured by default to bind to all available network interfaces (0.0.0.0) rather than restricting access to localhost or a specific management network. Combined with the complete absence of authentication requirements, this creates an extremely dangerous exposure.

The flaw represents a fundamental design deficiency where security was not considered as a default configuration. Any attacker with network visibility to the affected device can interact directly with the administrative interface without providing credentials, essentially having the same access level as a legitimate administrator.

Root Cause

The root cause of this vulnerability is insecure default configuration combined with missing authentication enforcement. The administrative interface was implemented without any authentication mechanism, and the network binding defaults to all interfaces rather than restricting access to trusted networks or localhost. This allows any network-adjacent or remote attacker (depending on network architecture) to access administrative functions.

Attack Vector

The attack vector for CVE-2024-47138 is network-based with no authentication required. An attacker simply needs network connectivity to the TCP port where the administrative interface is listening. The attack flow is straightforward:

Attacker identifies the target system on the network
Attacker scans for the administrative interface TCP port
Attacker connects directly to the administrative interface
Without any authentication challenge, the attacker gains full administrative access
Attacker can modify configurations, access sensitive data, or disrupt operations

Since no authentication is required, there are no credentials to brute force or bypass - the interface is simply open to any connecting client.

Detection Methods for CVE-2024-47138

Indicators of Compromise

Unexpected connections to the administrative interface TCP port from unauthorized IP addresses
Configuration changes made outside of normal maintenance windows
New or modified user accounts or access settings created through the administrative interface
Unusual network traffic patterns to the affected device from external or untrusted network segments

Detection Strategies

Implement network monitoring to detect connections to the administrative interface port from non-authorized source IPs
Deploy intrusion detection systems (IDS) with rules to alert on administrative interface access attempts
Enable and review device logs for administrative actions and correlate with authorized maintenance activities
Use network segmentation monitoring to detect attempts to access ICS management interfaces from production or external networks

Monitoring Recommendations

Configure SIEM alerts for any access to the administrative interface outside of scheduled maintenance windows
Monitor for network scanning activity targeting common ICS administrative ports
Implement continuous network traffic analysis between IT and OT network segments
Establish baseline administrative access patterns and alert on deviations

How to Mitigate CVE-2024-47138

Immediate Actions Required

Restrict network access to the administrative interface using firewall rules or network segmentation
Implement network-level authentication (e.g., VPN) before the administrative interface can be reached
Conduct an audit to identify any unauthorized changes that may have already occurred
Monitor for suspicious activity targeting affected devices while applying permanent fixes

Patch Information

Organizations should consult the CISA ICS Advisory ICSA-24-326-07 for specific vendor patch information and remediation guidance for affected products. Contact the device vendor directly for firmware updates or configuration guidance that addresses this vulnerability.

Workarounds

Configure firewall rules to restrict access to the administrative interface to trusted management IP addresses only
Implement network segmentation to isolate ICS devices from general network access
Use a jump host or bastion server for administrative access, adding an additional authentication layer
If possible, configure the device to bind the administrative interface only to localhost or a dedicated management network interface
Implement VPN requirements for any remote administrative access

bash

# Example firewall configuration (adapt to your environment)
# Restrict administrative interface access to management network only
iptables -A INPUT -p tcp --dport <ADMIN_PORT> -s 10.0.100.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport <ADMIN_PORT> -j DROP