CVE-2023-50272: HPE iLO 5 Authentication Bypass Flaw

CVE-2023-50272 Overview

A critical authentication bypass vulnerability has been identified in HPE Integrated Lights-Out 5 (iLO 5) and Integrated Lights-Out 6 (iLO 6) firmware. This vulnerability can be remotely exploited to allow attackers to bypass authentication mechanisms, potentially granting unauthorized access to server management interfaces without valid credentials.

Critical Impact

Remote attackers can bypass authentication on HPE iLO management interfaces, potentially gaining full administrative control over server hardware management, including the ability to power cycle systems, access virtual consoles, and modify BIOS settings.

Affected Products

• HPE Integrated Lights-Out 5 (iLO 5) Firmware
• HPE Integrated Lights-Out 5 Hardware
• HPE Integrated Lights-Out 6 (iLO 6) Firmware
• HPE Integrated Lights-Out 6 Hardware

Discovery Timeline

• 2023-12-19 - CVE-2023-50272 published to NVD
• 2025-05-07 - Last updated in NVD database

Technical Details for CVE-2023-50272

Vulnerability Analysis

This authentication bypass vulnerability (CWE-288: Authentication Bypass Using an Alternate Path or Channel) affects the web-based management interface of HPE iLO 5 and iLO 6 devices. iLO (Integrated Lights-Out) is HPE's remote server management technology that allows administrators to manage and monitor servers remotely, even when the host operating system is unresponsive or powered off.

The vulnerability enables remote attackers to bypass the authentication mechanisms entirely, gaining unauthorized access to the iLO management console. This is particularly dangerous because iLO operates independently of the host operating system and has deep hardware-level access to the server, including the ability to mount virtual media, access the virtual console, modify BIOS/UEFI settings, and control power states.

Given that the vulnerability is exploitable over the network without requiring any privileges or user interaction, it represents a significant threat to data center environments where iLO interfaces may be accessible on management networks.

Root Cause

The vulnerability stems from an authentication bypass condition (CWE-288) in the iLO firmware. While HPE has not disclosed the specific technical details of the flaw, authentication bypass vulnerabilities typically occur when alternative code paths exist that do not properly enforce authentication checks, allowing attackers to reach protected functionality without providing valid credentials.

Attack Vector

The attack vector is network-based, requiring no privileges or user interaction. An attacker with network access to the iLO management interface can potentially exploit this vulnerability to:

1. Gain unauthorized administrative access to the iLO console
2. Access server hardware management functions including power control
3. View and modify BIOS/UEFI configuration settings
4. Mount virtual media to the host system
5. Access the virtual KVM console for complete keyboard, video, and mouse control
6. Extract sensitive configuration data and credentials

The vulnerability is exploitable by sending crafted requests to the iLO web interface that bypass the normal authentication flow. Organizations should consult the HPE Security Advisory for specific technical details and affected firmware versions.

Detection Methods for CVE-2023-50272

Indicators of Compromise

• Unexpected administrative sessions or logins to iLO interfaces without corresponding authentication events
• Unusual access patterns to iLO management ports (typically TCP 443, 80, 17988, 17990)
• Configuration changes to iLO settings without authorized administrator activity
• Unexpected virtual media mounts or console sessions

Detection Strategies

• Monitor iLO access logs for authentication anomalies and session creation without proper login events
• Implement network traffic analysis on management network segments to detect unusual iLO communication patterns
• Deploy intrusion detection rules to identify potential exploitation attempts against iLO interfaces
• Correlate iLO access events with identity management systems to detect unauthorized access

Monitoring Recommendations

• Enable and centralize iLO logging to a SIEM platform for continuous monitoring
• Configure alerting for any administrative actions performed on iLO interfaces
• Implement network segmentation monitoring to detect lateral movement targeting management interfaces
• Regularly audit iLO user accounts and active sessions for unauthorized entries

How to Mitigate CVE-2023-50272

Immediate Actions Required

• Update HPE iLO 5 and iLO 6 firmware to the latest patched versions immediately
• Restrict network access to iLO management interfaces using firewalls and VLANs
• Implement strong authentication mechanisms including directory integration where possible
• Audit all iLO user accounts and remove unnecessary or default credentials

Patch Information

HPE has released firmware updates to address this vulnerability. Administrators should download and apply the latest iLO firmware from the HPE Support Center. The security advisory provides detailed information about affected firmware versions and the specific patches required for remediation.

Organizations should prioritize patching based on the critical nature of this vulnerability and the exposure of iLO interfaces within their environment.

Workarounds

• Isolate iLO management interfaces on a dedicated, highly restricted management network
• Implement strict firewall rules limiting iLO access to authorized administrator IP addresses only
• Disable iLO web interface access if not required and use alternative management methods
• Enable iLO security features such as login security banner and failed login lockout policies

# Configuration example
# Network isolation for iLO management interfaces
# Example firewall rules to restrict iLO access (adjust IPs as needed)

# Allow iLO access only from trusted management workstations
iptables -A INPUT -p tcp -s 10.0.100.0/24 --dport 443 -j ACCEPT
iptables -A INPUT -p tcp --dport 443 -j DROP

# Block iLO ports from untrusted networks
iptables -A INPUT -p tcp --dport 17988 -j DROP
iptables -A INPUT -p tcp --dport 17990 -j DROP