CVE-2024-31467: Arubanetworks ArubaOS RCE Vulnerability

CVE-2024-31467 Overview

CVE-2024-31467 is a critical buffer overflow vulnerability in the underlying CLI service of Aruba ArubaOS and HP InstantOS. This 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 grants attackers the ability to execute arbitrary code as a privileged user on the underlying operating system, potentially leading to complete device compromise.

Critical Impact

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

Affected Products

• ArubaNetworks ArubaOS (multiple versions)
• HP InstantOS (multiple versions)
• Network access points running affected firmware versions

Discovery Timeline

• 2024-05-14 - CVE-2024-31467 published to NVD
• 2025-06-24 - Last updated in NVD database

Technical Details for CVE-2024-31467

Vulnerability Analysis

This vulnerability is classified as CWE-121: Stack-based Buffer Overflow. The flaw resides in the CLI service component that handles PAPI protocol communications. When processing specially crafted UDP packets on port 8211, the service fails to properly validate input length, allowing an attacker to overflow stack buffers and overwrite critical memory structures including return addresses. The vulnerability requires no authentication, making it particularly dangerous for exposed network infrastructure. The network-accessible attack vector combined with no required privileges or user interaction makes this vulnerability highly exploitable in real-world scenarios.

Root Cause

The root cause is improper bounds checking in the CLI service when processing PAPI protocol messages. The service allocates a fixed-size buffer on the stack for incoming data but does not adequately verify that incoming packet data fits within this allocated space. When oversized or malformed packets are received, data overflows beyond the buffer boundary, corrupting adjacent stack memory. This classic stack-based buffer overflow pattern enables attackers to hijack program control flow.

Attack Vector

The attack is carried out over the network by sending specially crafted UDP packets to port 8211, which is the PAPI (Aruba's Access Point management protocol) communication port. An attacker does not need any authentication credentials or prior access to the device. The attack sequence involves:

1. Identifying accessible Aruba access points with exposed UDP port 8211
2. Crafting malicious PAPI protocol packets with oversized data fields designed to trigger the buffer overflow
3. Sending these packets to the target device
4. The overflow corrupts the stack, allowing the attacker to redirect execution to their payload
5. Arbitrary code executes with the privileges of the CLI service (typically root/privileged)

The exploitation does not require user interaction, and successful attacks result in complete compromise of the affected access point with the ability to execute arbitrary commands on the underlying operating system.

Detection Methods for CVE-2024-31467

Indicators of Compromise

• Unexpected or anomalous UDP traffic to port 8211 from external or untrusted sources
• Access point crashes, unexpected reboots, or service disruptions in the CLI service
• Unusual processes running with elevated privileges on Aruba/HP access points
• Network traffic patterns indicating reconnaissance or scanning of UDP port 8211

Detection Strategies

• Deploy network intrusion detection rules to monitor for malformed or oversized PAPI protocol packets on UDP port 8211
• Implement firewall rules to log and alert on unexpected external access attempts to management protocols
• Enable verbose logging on Aruba access points and forward logs to a SIEM for correlation analysis
• Conduct regular vulnerability scanning of network infrastructure to identify unpatched devices

Monitoring Recommendations

• Continuously monitor access point health status for unexpected service restarts or memory corruption indicators
• Establish baseline traffic patterns for PAPI protocol communications and alert on deviations
• Implement network segmentation monitoring to detect lateral movement following potential compromise
• Review access point audit logs for unauthorized configuration changes or new user accounts

How to Mitigate CVE-2024-31467

Immediate Actions Required

• Apply vendor-provided patches immediately to all affected ArubaOS and InstantOS devices
• Restrict access to UDP port 8211 from untrusted networks using firewall rules or access control lists
• Segment management network traffic to isolate access point management interfaces from general network access
• Audit network perimeter for any publicly exposed Aruba access points with accessible PAPI ports

Patch Information

Aruba Networks has released security patches to address this vulnerability. Administrators should consult the Aruba Networks PSA 2024-006 security advisory for specific version information and download links. Additionally, the HPE Security Bulletin provides comprehensive guidance for HP InstantOS deployments. Organizations should prioritize patching based on device exposure and criticality, focusing first on any access points reachable from untrusted networks.

Workarounds

• Block or restrict UDP port 8211 access at network boundaries to prevent external exploitation
• Implement network segmentation to isolate access point management interfaces on dedicated VLANs
• Deploy intrusion prevention systems (IPS) with signatures capable of detecting PAPI protocol anomalies
• Consider disabling PAPI protocol on devices where it is not required for operations, if supported by the firmware version

# Example firewall rule to restrict PAPI protocol access (adjust for your environment)
# Block external access to UDP port 8211 on network perimeter
iptables -A INPUT -p udp --dport 8211 -s ! 10.0.0.0/8 -j DROP
# Or using ACL on network equipment - restrict PAPI to management VLAN only
# access-list 100 deny udp any any eq 8211 log
# access-list 100 permit udp 10.10.10.0 0.0.0.255 any eq 8211