CVE-2024-8878: Riello Netman 204 Auth Bypass Vulnerability

CVE-2024-8878 Overview

CVE-2024-8878 is a critical authentication bypass vulnerability affecting the Riello Netman 204 network interface card used for UPS (Uninterruptible Power Supply) management. The vulnerability exists in the password recovery mechanism for forgotten passwords, which can be exploited by an unauthenticated attacker to reset the admin password and take complete control of the device. This flaw affects Netman 204 firmware versions through 4.05.

Critical Impact

An unauthenticated remote attacker can reset the administrator password without any prior authentication, resulting in complete device takeover. This could allow attackers to disrupt power management systems, potentially causing service outages for connected infrastructure.

Affected Products

• Riello-UPS Netman 204 Firmware (through version 4.05)
• Riello-UPS Netman 204 Hardware
• All deployments utilizing vulnerable Netman 204 network interface cards

Discovery Timeline

• 2024-09-25 - CVE-2024-8878 published to NVD
• 2025-11-04 - Last updated in NVD database

Technical Details for CVE-2024-8878

Vulnerability Analysis

This vulnerability is classified under CWE-640 (Weak Password Recovery Mechanism for Forgotten Password). The password recovery mechanism in Riello Netman 204 devices contains a fundamental design flaw that allows any network-accessible attacker to abuse the forgotten password functionality. Rather than properly validating the identity of the user requesting a password reset, the mechanism permits unauthenticated reset operations, effectively bypassing all authentication controls.

The network-accessible nature of this vulnerability means that any attacker with network access to the management interface can exploit this flaw without requiring any credentials or prior access to the system. The attack requires no user interaction and has low complexity, making it trivially exploitable once an attacker identifies a vulnerable device.

Root Cause

The root cause of CVE-2024-8878 lies in the improper implementation of the password recovery mechanism. The Netman 204 firmware fails to implement adequate verification steps before allowing password resets. A secure password recovery mechanism should verify the identity of the requester through secondary authentication factors, email verification, or security questions. The vulnerable implementation bypasses these essential security controls, allowing anyone with network access to initiate and complete the password reset process.

Attack Vector

The attack vector is network-based, requiring the attacker to have access to the network where the Netman 204 device management interface is exposed. The exploitation process involves:

1. An attacker identifies a Riello Netman 204 device on the network
2. The attacker accesses the password recovery functionality on the device's web interface
3. Without providing any valid credentials or identity verification, the attacker initiates a password reset
4. The system allows the password reset to complete, granting the attacker administrative access
5. With admin credentials, the attacker gains full control of the UPS management system

The vulnerability requires no authentication, no user interaction, and can be exploited with low attack complexity. Successful exploitation compromises confidentiality, integrity, and availability of both the device and any downstream systems that depend on the UPS for power management.

Detection Methods for CVE-2024-8878

Indicators of Compromise

• Unexpected password reset events or administrative credential changes on Netman 204 devices
• Unauthorized access to UPS management interfaces from unexpected IP addresses
• Configuration changes to UPS settings without corresponding change management records
• Unusual network traffic to the Netman 204 management interface, particularly to password recovery endpoints

Detection Strategies

• Monitor authentication logs for password reset activities on Netman 204 devices
• Implement network monitoring to detect access attempts to device management interfaces from unauthorized sources
• Deploy intrusion detection rules to identify traffic patterns associated with password recovery exploitation
• Conduct regular audits of Netman 204 device configurations to identify unauthorized changes

Monitoring Recommendations

• Enable comprehensive logging on all Netman 204 devices and forward logs to a centralized SIEM
• Set up alerts for any administrative credential changes on UPS management devices
• Monitor network segmentation boundaries to ensure management interfaces are not exposed to untrusted networks
• Implement change detection for device configurations to identify unauthorized modifications

How to Mitigate CVE-2024-8878

Immediate Actions Required

• Isolate Netman 204 management interfaces from untrusted networks immediately
• Implement strict network access controls to limit connectivity to management interfaces
• Audit all Netman 204 devices to verify current firmware versions and administrative credentials
• Review network architecture to ensure UPS management systems are properly segmented

Patch Information

Organizations should consult the Cyber Danube vulnerability report for detailed information about the vulnerability and any available patches or firmware updates from Riello-UPS. Contact Riello-UPS support directly for the latest firmware that addresses this vulnerability. Firmware versions through 4.05 are confirmed vulnerable.

Workarounds

• Restrict network access to Netman 204 management interfaces using firewall rules and VLANs
• Place all UPS management devices behind a VPN or jump host requiring authentication
• Disable the password recovery feature if possible through device configuration
• Implement network-level authentication before allowing access to management interfaces
• Consider physical access controls for environments where network segmentation cannot be implemented

# Example network segmentation configuration
# Restrict access to Netman 204 management interface (example for iptables)
iptables -A INPUT -p tcp --dport 80 -s 192.168.100.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport 443 -s 192.168.100.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport 80 -j DROP
iptables -A INPUT -p tcp --dport 443 -j DROP