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CVE-2026-9659

CRITICAL(9.1)

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

Risk Signal Score28/100 — MITTEL
  • CVSS 9.1 — Kritisch

Erwähnungen (letzte 60 Tage)

Artikel

EPSS-Score

0.8%

Exploit-Wahrscheinlichkeit (30 Tage)

CVSS Score

9.1

Technische Schwere

Beschreibung

Multiple exploitable stack-based buffer overflow vulnerabilities exist in the boa formFilter functionality of X2000R (version(s): TOTOLINK-X2000R-Gh-V1.0.0-B20250421.1327). A specially crafted HTTP request can lead to arbitrary code execution. An attacker can make an authenticated HTTP request to trigger these vulnerabilities. This vulnerability deals with the vpnUser parameter.

Erkennung & Indikatoren

Ausnutzung

In den geprüften Quellen nicht genannt

Threat-Hunting-Queries

Detection for authenticated HTTP requests to /boafrm/formFilter with unusually long or malformed 'vpnUser' parameters, indicative of a stack-based buffer overflow attempt.

Sentinel/Defender KQL

DeviceNetworkEvents
| where ActionType == "HttpRequest" and RemoteUrl contains "/boafrm/formFilter"
| where AdditionalFields contains "vpnUser="
| where strlen(tostring(AdditionalFields)) > 2000 // Adjust threshold based on normal traffic
| project DeviceName, RemoteUrl, AdditionalFields, InitiatingProcessCommandLine, InitiatingProcessFileName

Splunk SPL

sourcetype=access_combined uri_path="/boafrm/formFilter" method="POST" form_data=*vpnUser=*
| eval vpnUser_length = len(mvindex(split(form_data, "vpnUser="), 1))
| where vpnUser_length > 2000 // Adjust threshold based on normal traffic
| table _time, host, uri_path, form_data, vpnUser_length

Sigma

title: Totolink X2000R formFilter Buffer Overflow Attempt
id: 7e0e8e1f-2c3d-4f5a-8b9c-0d1e2f3g4h5i
status: experimental
description: Detects potential exploitation attempts against Totolink X2000R formFilter functionality via unusually long vpnUser parameters.
references:
  - https://talosintelligence.com/vulnerability_reports/TALOS-2026-2425
author: SecBoard
date: 2026/10/20
logsource:
  category: webserver
  product: generic
detection:
  selection:
    cs-uri-stem: '/boafrm/formFilter'
    cs-method: 'POST'
    cs-uri-query|contains: 'vpnUser='
  filter:
    cs-uri-query|length:
      - '>2000' # Adjust threshold based on normal traffic
  condition: selection and not filter
fields:
  - cs-uri-stem
  - c-ip
  - cs-username
tags:
  - attack.initial_access
  - attack.t1190
  - cve.2026.9659
level: high

Elastic ES|QL

from logs-webserver.*
| where url.path == "/boafrm/formFilter" and http.request.method == "POST"
| where url.query contains "vpnUser="
| where length(url.query) > 2000 // Adjust threshold based on normal traffic
| select @timestamp, host.name, url.original, http.request.body.content, user.name

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Indikatoren

Domains (1)

  • www.totolink.net

Übernommen wurden nur Indikatoren, die wörtlich in einer Hersteller- oder Research-Quelle standen.

Referenzen