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CVE-2026-17545

HIGH(7.5)

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

Risk Signal Score19/100 — NIEDRIG
  • CVSS 7.5 — Hoch

Erwähnungen (letzte 60 Tage)

Artikel

EPSS-Score

0.4%

Exploit-Wahrscheinlichkeit (30 Tage)

CVSS Score

7.5

Technische Schwere

Beschreibung

On Windows, PHP's filesystem and stream APIs do not reject reserved device names such as CON, PRN, AUX, NUL, COM1 to COM9, LPT1 to LPT9, CONIN$ and CONOUT$ when they appear as a component of a path. An attacker-controlled filename therefore reaches CreateFileW() and opens a device instead of the regular file the application expected, which can block or hang the request and exhaust worker processes.

Erkennung & Indikatoren

Ausnutzung

In den geprüften Quellen nicht genannt

Behobene Versionen

  • 8.2.34
  • 8.3.35
  • 8.4.26
  • 8.5.11

Threat-Hunting-Queries

This vulnerability allows an attacker to cause a Denial of Service by using reserved device names in file paths on Windows. Detection should focus on identifying attempts to create or access files with these reserved names within PHP applications.

Sentinel/Defender KQL

DeviceFileEvents
| where InitiatingProcessCommandLine contains "php" and (FileName in ("CON", "PRN", "AUX", "NUL") or FileName matches regex "COM[1-9]" or FileName matches regex "LPT[1-9]" or FileName in ("CONIN$", "CONOUT$"))

Splunk SPL

index=* sourcetype=WinEventLog:*
| search CommandLine=*php* (FileName=CON OR FileName=PRN OR FileName=AUX OR FileName=NUL OR FileName=COM[1-9] OR FileName=LPT[1-9] OR FileName=CONIN$ OR FileName=CONOUT$)

Sigma

title: PHP Windows Reserved Device Name DoS
status: experimental
description: Detects attempts to use reserved Windows device names in PHP file operations, which can lead to a Denial of Service.
logsource:
  category: process_creation
  product: windows
detection:
  selection:
    Image|endswith: '\php.exe'
    CommandLine|contains:
      - 'CON'
      - 'PRN'
      - 'AUX'
      - 'NUL'
      - 'COM1'
      - 'COM2'
      - 'COM3'
      - 'COM4'
      - 'COM5'
      - 'COM6'
      - 'COM7'
      - 'COM8'
      - 'COM9'
      - 'LPT1'
      - 'LPT2'
      - 'LPT3'
      - 'LPT4'
      - 'LPT5'
      - 'LPT6'
      - 'LPT7'
      - 'LPT8'
      - 'LPT9'
      - 'CONIN$'
      - 'CONOUT$'
  condition: selection
fields:
  - CommandLine
  - Image
tags:
  - attack.dos
  - cve.2026.17545

Elastic ES|QL

FROM process
| WHERE process.executable.name : "php.exe" AND (
  process.args : "*CON*" OR
  process.args : "*PRN*" OR
  process.args : "*AUX*" OR
  process.args : "*NUL*" OR
  process.args : "*COM[1-9]*" OR
  process.args : "*LPT[1-9]*" OR
  process.args : "*CONIN$*" OR
  process.args : "*CONOUT$*"
)

SecBoard-generated · behavioral · requires customization — Von SecBoard erzeugt und nicht in einer Zielumgebung validiert. Vor dem Einsatz an die eigene Protokollierung anpassen.

Betroffene Produkte

  • cpe:2.3:a:php:php:*:*:*:*:*:*:*:*
  • cpe:2.3:a:php:php:*:*:*:*:*:*:*:*
  • cpe:2.3:a:php:php:*:*:*:*:*:*:*:*
  • cpe:2.3:a:php:php:*:*:*:*:*:*:*:*

Referenzen