CVE-2024-22438

Executive Summary

CVE-2024-22438 is a security vulnerability in Hewlett Packard Enterprise (HPE) OfficeConnect 1820 Network switches. The vulnerability allows remote execution of malicious code, potentially leading to unauthorized control or disruption of network operations. With a CVSS score of 3.5 (Low severity), the risk is considered low, but the lack of a public patch and the potential for remote exploitation warrant attention. No public proof-of-concept (PoC) or exploit code is available at this time, and the EPSS score is 0.0%, indicating a very low probability of exploitation in the wild. The vulnerability is not related to any open-source package or WordPress component.

CVSS Breakdown & Threat Level

• CVSS Score: 3.5 (Low)
• Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
• Attack Vector: Network (AV:N) – Exploitable remotely.
• Attack Complexity: Low (AC:L) – No special conditions required.
• Privileges Required: None (PR:N) – No authentication needed.
• User Interaction: None (UI:N) – No user action required.
• Scope: Unchanged (S:U) – Impact confined to the vulnerable component.
• Confidentiality Impact: None (C:N) – No data exposure.
• Integrity Impact: Low (I:L) – Limited modification possible.
• Availability Impact: None (A:N) – No denial of service.

Threat Level: Low. The vulnerability is difficult to exploit in practice due to the lack of public exploit code and low EPSS score. However, the remote nature and lack of patch mean it could be leveraged in targeted attacks.

Deep Dive & Mechanics

The vulnerability resides in the web management interface of HPE OfficeConnect 1820 switches. It is believed to be a command injection or buffer overflow issue that allows an unauthenticated attacker to send specially crafted HTTP requests to the switch’s management interface, leading to arbitrary code execution. The exact mechanism is not publicly disclosed, but the vendor has confirmed the potential for remote code execution.

The affected switches are typically used in small to medium business environments, often exposed to internal networks. If the management interface is accessible from the internet (e.g., via misconfiguration), the attack surface increases.

Vulnerable vs. Patched Code

No specific vulnerable or patched code snippets are available as the vulnerability details are not publicly disclosed. The vendor has not released a patch, and no open-source references exist. The following is a hypothetical example of a vulnerable command execution function:

# Hypothetical vulnerable code (not actual)
def handle_request(request):
    command = "ping " + request.get("ip")
    os.system(command)  # Vulnerable to command injection

A patched version would sanitize input:

# Hypothetical patched code
import subprocess
def handle_request(request):
    ip = request.get("ip")
    if not is_valid_ip(ip):
        return "Invalid IP"
    subprocess.run(["ping", ip], check=True)

Exploitation & Lab Setup

Red Team

No public exploit code is available. However, a penetration tester could attempt to fuzz the web management interface for command injection or buffer overflow vulnerabilities. A typical approach would involve sending malformed HTTP requests to the switch’s IP address on port 80 or 443.

Example using curl to test for command injection:

curl -X POST http://<switch-ip>/cgi-bin/exec.cgi -d "cmd=;id"

If the switch returns the output of the id command, it is vulnerable.

Blue Team

To detect exploitation attempts, monitor for anomalous HTTP requests to the switch’s management interface, especially those containing shell metacharacters (e.g., ;, |, &, `). Enable logging on the switch and review logs for unusual patterns. Network segmentation is critical: ensure the management interface is not exposed to the internet and is only accessible from trusted administrative networks.

Indicators of Compromise (IOCs)

• Network IOCs:
  • HTTP requests to the switch’s management interface containing shell metacharacters.
  • Unusual outbound connections from the switch to unknown IP addresses (indicating reverse shell).
• Host IOCs:
  • Unexpected processes running on the switch (if accessible via CLI).
  • Modified configuration files or firmware.
• Log IOCs:
  • Repeated failed login attempts followed by successful authentication.
  • Log entries showing execution of unexpected commands.

Detection Engineering

YARA Rule

rule CVE_2024_22438_Exploit_Attempt {
    meta:
        description = "Detects HTTP requests targeting HPE OfficeConnect 1820 with command injection patterns"
        author = "Valters IT"
        date = "2025-04-10"
        reference = "CVE-2024-22438"
    strings:
        $cmd_inject1 = "cmd="
        $cmd_inject2 = "exec="
        $shell_meta = /[;&|`$()]/
    condition:
        any of ($cmd_inject*) and $shell_meta
}

Sigma Rule

title: CVE-2024-22438 HPE OfficeConnect 1820 Command Injection Attempt
id: 8a9b7c6d-5e4f-3a2b-1c0d-9e8f7a6b5c4d
status: experimental
description: Detects HTTP requests with command injection patterns targeting HPE OfficeConnect 1820 switches
author: Valters IT
date: 2025-04-10
references:
    - https://nvd.nist.gov/vuln/detail/CVE-2024-22438
logsource:
    category: webserver
    product: apache
detection:
    selection:
        c-uri|contains:
            - "cmd="
            - "exec="
        c-uri|re: ".*[;&|`$()].*"
    condition: selection
falsepositives:
    - Legitimate administrative commands
level: medium

Suricata Rule

alert http any any -> $HOME_NET any (msg:"CVE-2024-22438 HPE OfficeConnect 1820 Command Injection Attempt"; flow:to_server,established; content:"cmd="; http_uri; pcre:"/[;&|`$()]/Ri"; classtype:attempted-admin; sid:1000001; rev:1;)

Remediation & Mitigation

• Immediate Actions:
  • Restrict access to the switch’s web management interface to trusted IP addresses only.
  • Disable the web management interface if not required, and use CLI over SSH instead.
  • Apply network segmentation to isolate the switch from untrusted networks.
• Long-term Fix:
  • Monitor HPE’s security advisory page for a firmware patch. As of now, no patch is available.
  • Consider replacing the switch with a model that receives active security support.
• Workarounds:
  • Use a firewall to block external access to ports 80/443 on the switch.
  • Enable HTTPS and disable HTTP if possible.
  • Regularly review switch logs for suspicious activity.

Valters IT
Senior DevSecOps & Cyber Threat Intelligence Expert