CVE-2024-32238: H3C ER8300G2-X Auth Bypass Vulnerability

CVE-2024-32238 Overview

CVE-2024-32238 is a critical Incorrect Access Control vulnerability affecting the H3C ER8300G2-X enterprise router. The vulnerability allows unauthenticated attackers to access the router's management system password directly through the management system page login interface, enabling complete compromise of the network device.

Critical Impact

The management system password can be accessed via the login interface without authentication, allowing attackers to gain full administrative control over the router.

Affected Products

• H3C ER8300G2-X Enterprise Router

Discovery Timeline

• 2024-04-22 - CVE-2024-32238 published to NVD
• 2024-11-21 - Last updated in NVD database

Technical Details for CVE-2024-32238

Vulnerability Analysis

This vulnerability is classified under CWE-522 (Insufficiently Protected Credentials), indicating that the H3C ER8300G2-X router fails to adequately protect sensitive authentication credentials. The vulnerability exists in the management system's login interface, where the router's administrative password is exposed to unauthenticated users. This represents a fundamental flaw in the access control implementation of the device's web management interface.

The network-accessible nature of this vulnerability means that any attacker with network access to the router's management interface can retrieve the administrative password without requiring any prior authentication or user interaction. This could lead to complete compromise of the device, allowing attackers to modify routing configurations, intercept network traffic, establish persistent access, or use the compromised router as a pivot point for further attacks within the network.

Root Cause

The root cause of CVE-2024-32238 lies in improper access control implementation within the H3C ER8300G2-X management system. The login interface fails to properly restrict access to sensitive credential information, allowing the router's management password to be retrieved without authentication. This design flaw exposes critical authentication data through the web interface that should only be accessible to authenticated administrators.

Attack Vector

The attack vector for this vulnerability is network-based. An attacker can exploit this vulnerability by accessing the router's management interface login page. The exploit requires no authentication, no privileges, and no user interaction, making it trivially exploitable by anyone who can reach the management interface over the network.

The exploitation flow involves accessing the management system page login interface, where the password information is improperly exposed. Once retrieved, the attacker gains full administrative access to the router. For detailed technical information, see the GitHub CVE-2024-32238 Issue.

Detection Methods for CVE-2024-32238

Indicators of Compromise

• Unexpected login attempts or successful authentications to the router's management interface from unknown IP addresses
• Configuration changes to the router that were not authorized by network administrators
• Unusual network traffic patterns originating from or passing through the affected router
• New administrative accounts or modified existing account credentials

Detection Strategies

• Monitor access logs for the H3C ER8300G2-X management interface for unauthorized access attempts
• Implement network monitoring to detect connections to the router's management port from untrusted sources
• Deploy intrusion detection rules to identify reconnaissance activity targeting H3C router management interfaces
• Conduct regular audits of router configurations to detect unauthorized modifications

Monitoring Recommendations

• Implement network segmentation to isolate management interfaces from untrusted networks
• Enable logging on all access attempts to the router's web management interface
• Configure alerts for any login activity outside of normal maintenance windows
• Monitor for outbound connections from the router to unknown destinations that could indicate compromise

How to Mitigate CVE-2024-32238

Immediate Actions Required

• Restrict network access to the H3C ER8300G2-X management interface to trusted IP addresses only using firewall rules
• Ensure the management interface is not exposed to the public internet
• Change the router's administrative password immediately and implement strong password policies
• Review router logs for evidence of unauthorized access or configuration changes
• Consider disabling the web management interface if not required, using CLI-based management instead

Patch Information

At the time of publication, no vendor patch information was available in the CVE data. Organizations should contact H3C directly for firmware updates or security guidance. Monitor the H3C ER8300G2-X Product Page for security advisories and firmware updates.

Workarounds

• Implement strict access control lists (ACLs) to limit management interface access to specific trusted administrator IP addresses
• Place the router's management interface on an isolated management VLAN not accessible from user networks
• Deploy a VPN requirement for all management access to network infrastructure
• Consider using out-of-band management networks for critical infrastructure devices
• Implement multi-factor authentication at the network level if direct patching is unavailable

# Example ACL configuration to restrict management access (adjust for your environment)
# Limit management interface access to specific trusted IP ranges
# Block access from all untrusted networks to management port (typically TCP 80/443)
iptables -A INPUT -p tcp --dport 80 -s 10.0.0.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport 443 -s 10.0.0.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport 80 -j DROP
iptables -A INPUT -p tcp --dport 443 -j DROP