CVE-2024-38902: H3C Magic R230 Auth Bypass Vulnerability

CVE-2024-38902 Overview

CVE-2024-38902 is a critical hardcoded credentials vulnerability affecting the H3C Magic R230 router running firmware version V100R002. The vulnerability exists within the /etc/shadow file, which contains a hardcoded password that allows remote attackers to authenticate as the root user. This type of vulnerability (CWE-259: Use of Hard-coded Password) represents a severe security flaw in embedded device firmware that completely bypasses authentication mechanisms.

Critical Impact
Remote attackers can gain full root-level access to affected H3C Magic R230 routers without requiring prior authentication, enabling complete device takeover, network pivoting, and persistent access to enterprise or home networks.

Affected Products

H3C Magic R230 Firmware version V100R002
H3C Magic R230 hardware devices
All deployments running the affected firmware version

Discovery Timeline

2024-06-24 - CVE-2024-38902 published to NVD
2025-05-27 - Last updated in NVD database

Technical Details for CVE-2024-38902

Vulnerability Analysis

This vulnerability stems from the inclusion of hardcoded credentials within the router's firmware. The /etc/shadow file, which stores password hashes on Linux-based systems, contains a static password hash for the root account that is identical across all deployed devices running the affected firmware version. This architectural flaw allows anyone with knowledge of the hardcoded password to authenticate as root on any vulnerable device.

The impact of this vulnerability is severe. Successful exploitation grants attackers full administrative control over the router, enabling them to modify network configurations, intercept traffic, install persistent backdoors, or use the compromised device as a pivot point for lateral movement within the network.

Root Cause

The root cause is the use of a hardcoded password embedded directly in the firmware's /etc/shadow file (CWE-259). This is a common but dangerous practice in IoT and embedded device development where manufacturers include static credentials for administrative access. Once the password is discovered through firmware analysis or reverse engineering, it can be used to compromise any device running the affected firmware version.

Attack Vector

The vulnerability is exploitable over the network without requiring authentication or user interaction. An attacker can:

Identify H3C Magic R230 devices through network scanning or Shodan-style reconnaissance
Obtain the hardcoded password through firmware extraction and analysis of the /etc/shadow file
Authenticate to the device's administrative interface (SSH, Telnet, or web console) using the hardcoded root credentials
Gain full administrative control of the device

The exploitation methodology involves extracting the firmware, analyzing the password hash in /etc/shadow, and either cracking the hash or using known default credentials. For detailed technical information, refer to the GitHub IoT Vulnerability Report.

Detection Methods for CVE-2024-38902

Indicators of Compromise

Unexpected or unauthorized SSH/Telnet login sessions to affected routers
Root-level authentication attempts from external or unexpected IP addresses
Modified system configurations or unauthorized firmware changes
Unusual outbound network traffic from the router device
New user accounts or SSH keys added to the system

Detection Strategies

Monitor authentication logs for root login attempts from untrusted sources
Deploy network intrusion detection signatures for known exploitation patterns
Implement asset inventory to identify all H3C Magic R230 devices on the network
Use vulnerability scanners configured to detect hardcoded credential issues
Analyze firmware versions to identify devices running V100R002

Monitoring Recommendations

Enable comprehensive logging on all network devices including router authentication events
Configure SIEM alerts for successful root logins from external networks
Monitor for unusual administrative commands or configuration changes
Establish baseline network behavior and alert on anomalies from router devices

How to Mitigate CVE-2024-38902

Immediate Actions Required

Identify all H3C Magic R230 devices running firmware version V100R002 in your environment
Isolate vulnerable devices from untrusted networks until patched
Restrict administrative access to trusted management networks only
Implement network segmentation to limit exposure of IoT and router devices
Monitor affected devices for signs of compromise

Patch Information

At the time of this writing, no vendor advisory or official patch information has been published by H3C. Organizations should contact H3C support directly to inquire about firmware updates that address this hardcoded credential vulnerability. Monitor the GitHub IoT Vulnerability Report for additional technical details.

Workarounds

Disable remote administrative access (SSH, Telnet, web interface) from untrusted networks
Implement firewall rules to restrict management interface access to specific trusted IP addresses
Place affected devices behind a VPN to limit exposure
Consider replacing affected devices with alternatives if no patch becomes available
Monitor authentication logs closely for unauthorized access attempts

bash

# Example: Restrict SSH access to management network only (firewall rule)
# Adjust IP ranges according to your network architecture
iptables -A INPUT -p tcp --dport 22 -s 192.168.1.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport 22 -j DROP