CVE-2024-31471: ArubaOS RCE Vulnerability via PAPI

CVE-2024-31471 Overview

CVE-2024-31471 is a critical command injection vulnerability affecting the Central Communications service in ArubaOS and HP InstantOS. The flaw allows unauthenticated remote code execution by sending specially crafted packets to the PAPI (Aruba's Access Point management protocol) UDP port 8211. Successful exploitation enables attackers to execute arbitrary commands as a privileged user on the underlying operating system, posing severe risks to enterprise wireless network infrastructure.

Critical Impact

Unauthenticated attackers can achieve remote code execution with privileged access on affected Aruba access points and controllers, potentially compromising entire wireless network segments.

Affected Products

• ArubaNetworks ArubaOS
• HP InstantOS

Discovery Timeline

• 2024-05-14 - CVE-2024-31471 published to NVD
• 2025-06-24 - Last updated in NVD database

Technical Details for CVE-2024-31471

Vulnerability Analysis

This command injection vulnerability (CWE-78: Improper Neutralization of Special Elements used in an OS Command) exists within the Central Communications service that handles PAPI protocol communications. The vulnerability stems from insufficient input validation of data received on UDP port 8211, which is used for Aruba Access Point management communications.

When the Central Communications service processes incoming PAPI packets, it fails to properly sanitize user-controlled input before passing it to system command execution functions. This allows an attacker to inject arbitrary operating system commands that execute with the privileges of the service process—typically root or a similarly privileged account on the access point or controller.

The attack requires no authentication, making it particularly dangerous for organizations with network-accessible management interfaces. An attacker with network access to UDP port 8211 can remotely compromise affected devices without any credentials.

Root Cause

The root cause is improper neutralization of special elements in user-supplied input within the Central Communications service. The service accepts PAPI protocol messages over UDP port 8211 and processes packet contents without adequate validation or sanitization. When this input is subsequently used in operating system command construction, attackers can break out of the intended command context and inject malicious commands.

Attack Vector

The attack is conducted over the network by sending specially crafted UDP packets to port 8211 on vulnerable Aruba access points or controllers. The attacker does not require authentication or any prior access to the target system. The attack flow involves:

1. Attacker identifies a target device running vulnerable ArubaOS or InstantOS with PAPI port accessible
2. Attacker crafts malicious UDP packets containing command injection payloads
3. Packets are sent to the target's UDP port 8211
4. The Central Communications service processes the malicious packets
5. Injected commands execute with privileged user context on the target device

The vulnerability mechanism involves sending crafted PAPI protocol packets to UDP port 8211, where improper input handling allows command metacharacters to break out of the intended command context. For detailed technical specifications, refer to the Aruba Networks Security Advisory.

Detection Methods for CVE-2024-31471

Indicators of Compromise

• Unexpected outbound network connections from Aruba access points or controllers
• Unusual processes spawned by the Central Communications service
• Anomalous UDP traffic patterns to port 8211 with malformed or oversized packets
• Evidence of unauthorized configuration changes on wireless infrastructure devices

Detection Strategies

• Deploy network intrusion detection systems (IDS) with rules monitoring UDP port 8211 for malicious patterns
• Enable comprehensive logging on Aruba devices and forward logs to a SIEM for anomaly detection
• Monitor for unusual process execution chains originating from the Central Communications service
• Implement network segmentation monitoring to detect lateral movement from compromised access points

Monitoring Recommendations

• Establish baselines for normal PAPI traffic patterns and alert on deviations
• Configure alerts for any root-level process spawning on access points outside normal operations
• Monitor network egress from wireless infrastructure devices for command-and-control indicators
• Review audit logs for privilege escalation attempts or unauthorized administrative actions

How to Mitigate CVE-2024-31471

Immediate Actions Required

• Apply vendor-provided security patches immediately to all affected ArubaOS and InstantOS devices
• Restrict network access to UDP port 8211 using firewall rules, limiting access to trusted management networks only
• Segment wireless infrastructure management interfaces from general network traffic
• Conduct an audit of potentially affected devices to verify current firmware versions

Patch Information

HPE Aruba Networking has released security updates addressing this vulnerability. Administrators should consult the Aruba Networks PSA-2024-006 Advisory and the HPE Security Document for specific patched versions and upgrade guidance. Organizations should prioritize upgrading to the latest supported firmware versions that include fixes for this vulnerability.

Workarounds

• Implement strict network access controls to block unauthorized access to UDP port 8211 from untrusted networks
• Deploy dedicated management VLANs for all wireless infrastructure with restricted routing
• Use firewall rules to allow PAPI traffic only from authorized management stations
• Monitor and log all traffic to management ports pending patch deployment

Network access control lists can be configured to restrict PAPI protocol access. The specific configuration depends on your firewall or network device. Filter rules should block UDP port 8211 from all sources except trusted management networks. Consult your network device documentation for the appropriate ACL or firewall rule syntax for your environment.