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Web Companion 5.1.1035.1047 WCAssistantService Unquoted Service Path

Web Companion 5.1.1035.1047 WCAssistantService Unquoted Service Path
Posted Oct 17, 2019
Authored by Debashis Pal

Web Companion version 5.1.1035.1047 suffers from a WCAssistantService unquoted service path vulnerability.

tags | exploit, web
SHA-256 | dac13bee5194b4ad3fe44d73a304d94c762cd2a9aba81df6dc9855e64cef2de4

Web Companion 5.1.1035.1047 WCAssistantService Unquoted Service Path

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# Exploit Title: Web Companion versions 5.1.1035.1047 - 'WCAssistantService' Unquoted Service Path
# Exploit Author: Debashis Pal
# Date: 2019-10-17
# Vendor Homepage : https://webcompanion.com
# Source: https://webcompanion.com
# Version: Web Companion versions 5.1.1035.1047
# CVE : N/A
# Tested on: Windows 7 SP1(64bit)

1. Description:
Web Companion versions 5.1.1035.1047 service 'WCAssistantService' have an unquoted service path.

2. PoC:

C:\>sc qc WCAssistantService
sc qc WCAssistantService
[SC] QueryServiceConfig SUCCESS

SERVICE_NAME: WCAssistantService
TYPE : 10 WIN32_OWN_PROCESS
START_TYPE : 2 AUTO_START
ERROR_CONTROL : 1 NORMAL
BINARY_PATH_NAME : C:\Program Files (x86)\Lavasoft\Web Companion\Application\Lavasoft.WCAssistant.WinService.exe
LOAD_ORDER_GROUP :
TAG : 0
DISPLAY_NAME : WC Assistant
DEPENDENCIES :
SERVICE_START_NAME : LocalSystem


3. Exploit:
A successful attempt would require the local user to be able to insert their code in the system root path undetected by the OS or other security applications where it could potentially be executed during application startup or reboot.
If successful, the local user's code would execute with the elevated privileges of the application.

# Disclaimer
=============
The information contained within this advisory is supplied "as-is" with no warranties or guarantees of fitness of use or otherwise.
The author is not responsible for any misuse of the information contained herein and accepts no responsibility for any damage caused by the use or misuse of this information.
The author prohibits any malicious use of security related information or exploits by the author or elsewhere.
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