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ZKTeco ZKTime.Net 3.0.1.6 Insecure File Permissions

ZKTeco ZKTime.Net 3.0.1.6 Insecure File Permissions
Posted Aug 31, 2016
Authored by LiquidWorm | Site zeroscience.mk

ZKTime.Net suffers from an elevation of privileges vulnerability which can be used by a simple user that can change the executable file with a binary of choice. The vulnerability exist due to the improper permissions, with the 'C' flag (Change) for 'Everyone' group, making the entire directory 'ZKTimeNet3.0' and its files and sub-dirs world-writable. Version 3.0.1.6 is affected.

tags | exploit
SHA-256 | 9cb88adc874e989e21366fdcd577e8bd531dda6ee9584e15f2e77c43ddc2e0d1

ZKTeco ZKTime.Net 3.0.1.6 Insecure File Permissions

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ZKTeco ZKTime.Net 3.0.1.6 Insecure File Permissions


Vendor: ZKTeco Inc. | Xiamen ZKTeco Biometric Identification Technology Co.,ltd
Product web page: http://www.zkteco.com
Affected version: 3.0.1.6
3.0.1.5 (160622)
3.0.1.1 (160216)

Summary: ZKTime.Net V3.0 is a new generation time attendance
management software. Meanwhile, it integrates with time attendance
and access control system. Some frequently used functions such as
attendance reports, device management and employee management can
be managed directly on the home page which providing excellent user
experience. Owing to the Pay code function, it can generate both
time attendance records and corresponding payroll in the software
and easy to merge with the most ERP and Payroll software, which can
rapidly upgrade your working efficiency. The brand new flat GUI design
and humanized structure will make your daily management more pleasant
and convenient.

Desc: ZKTime.Net suffers from an elevation of privileges vulnerability
which can be used by a simple user that can change the executable file
with a binary of choice. The vulnerability exist due to the improper
permissions, with the 'C' flag (Change) for 'Everyone' group, making the
entire directory 'ZKTimeNet3.0' and its files and sub-dirs world-writable.

Tested on: Microsoft Windows 7 Ultimate SP1 (EN)
Microsoft Windows 7 Professional SP1 (EN)


Vulnerability discovered by Gjoko 'LiquidWorm' Krstic
@zeroscience


Advisory ID: ZSL-2016-5360
Advisory URL: http://www.zeroscience.mk/en/vulnerabilities/ZSL-2016-5360.php


18.07.2016

--


C:\>showacls "c:\Program Files (x86)\ZKTimeNet3.0"
c:\Program Files (x86)\ZKTimeNet3.0
Everyone Change [RWXD]
NT SERVICE\TrustedInstaller Special Access [A]
NT AUTHORITY\SYSTEM Special Access [A]
BUILTIN\Administrators Special Access [A]
BUILTIN\Users Special Access [RX]
CREATOR OWNER Special Access [A]


C:\>showacls "c:\Program Files (x86)\ZKTimeNet3.0\ZKTimeNet.exe"
c:\Program Files (x86)\ZKTimeNet3.0\ZKTimeNet.exe
Everyone Change [RWXD]



C:\Program Files (x86)>cacls ZKTimeNet3.0
C:\Program Files (x86)\ZKTimeNet3.0 Everyone:(OI)(CI)C
NT SERVICE\TrustedInstaller:(ID)F
NT SERVICE\TrustedInstaller:(CI)(IO)(ID)F
NT AUTHORITY\SYSTEM:(ID)F
NT AUTHORITY\SYSTEM:(OI)(CI)(IO)(ID)F
BUILTIN\Administrators:(ID)F
BUILTIN\Administrators:(OI)(CI)(IO)(ID)F
BUILTIN\Users:(ID)R
BUILTIN\Users:(OI)(CI)(IO)(ID)(special access:)
GENERIC_READ
GENERIC_EXECUTE

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


C:\Program Files (x86)\ZKTimeNet3.0>cacls *.exe
C:\Program Files (x86)\ZKTimeNet3.0\LanguageTranslate.exe Everyone:C
Everyone:(ID)C
NT AUTHORITY\SYSTEM:(ID)F
BUILTIN\Administrators:(ID)F
BUILTIN\Users:(ID)R

C:\Program Files (x86)\ZKTimeNet3.0\unins000.exe Everyone:(ID)C
NT AUTHORITY\SYSTEM:(ID)F
BUILTIN\Administrators:(ID)F
BUILTIN\Users:(ID)R

C:\Program Files (x86)\ZKTimeNet3.0\ZKTimeNet.DBTT.exe Everyone:C
Everyone:(ID)C
NT AUTHORITY\SYSTEM:(ID)F
BUILTIN\Administrators:(ID)F
BUILTIN\Users:(ID)R

C:\Program Files (x86)\ZKTimeNet3.0\ZKTimeNet.exe Everyone:C
Everyone:(ID)C
NT AUTHORITY\SYSTEM:(ID)F
BUILTIN\Administrators:(ID)F
BUILTIN\Users:(ID)R

C:\Program Files (x86)\ZKTimeNet3.0\ZKTimeNet.Update.exe Everyone:C
Everyone:(ID)C
NT AUTHORITY\SYSTEM:(ID)F
BUILTIN\Administrators:(ID)F
BUILTIN\Users:(ID)R

C:\Program Files (x86)\ZKTimeNet3.0\ZKTimeNet.ZKTime5DB.exe Everyone:C
Everyone:(ID)C
NT AUTHORITY\SYSTEM:(ID)F
BUILTIN\Administrators:(ID)F
BUILTIN\Users:(ID)R

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