ZKTeco ZKTime.Net 3.0.1.6 Insecure File Permissions

`i>>?  
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  
  
`