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Aloaha Credential Provider Monitor 5.0.226 Privilege Escalation

Aloaha Credential Provider Monitor 5.0.226 Privilege Escalation
Posted Jan 20, 2013
Authored by LiquidWorm | Site zeroscience.mk

The Aloaha Credential Provider Service is vulnerable to 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 'F' flag (full) for the 'Everyone' group, for the 'AloahaCredentialProviderService.exe' binary file. The service was shipped with Aloaha PDF Saver and possibly every SmartCard Software package from Aloaha. The files are installed in the 'Wrocklage' directory which has the Everyone group assigned to it with full permissions making every single file inside vulnerable to change by any user on the affected machine. After you replace the binary with your rootkit, on reboot you get SYSTEM privileges. Version 5.0.226 is affected.

tags | exploit
SHA-256 | 86f982e569b0f1f904c32d53114ecd09799c64e9d1da2a83c984bcc83bd4171a

Aloaha Credential Provider Monitor 5.0.226 Privilege Escalation

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Aloaha Credential Provider Monitor 5.0.226 Local Privilege Escalation Vulnerability


Vendor: Aloaha Software - Wrocklage Intermedia GmbH
Product web page: http://www.aloaha.com
Affected version: 5.0.226

Summary: Aloaha Credential Provider represents one of the most dramatic changes
in the Windows Vista / 7 logon screen, making it much easier to implement new user
authentication scenarios that are supported by the OS. To be able to logon via
Smartcard to a windows machine requires usually the machine being a member of a
domain. With the Aloaha Credential Provider that is not required, the logon screen
is the first thing users see when they turn on the computer.

Desc: The Aloaha Credential Provider Service is vulnerable to 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 'F' flag (full) for the 'Everyone' group, for the
'AloahaCredentialProviderService.exe' binary file. The service was shipped with
Aloaha PDF Saver and possibly every SmartCard Software package from Aloaha. The
files are installed in the 'Wrocklage' directory which has the Everyone group
assigned to it with full permissions making every single file inside vulnerable
to change by any user on the affected machine. After you replace the binary with
your rootkit, on reboot you get SYSTEM privileges.

Tested on: Microsoft Windows 7 Ultimate SP1 (EN) 32bit/64bit


Vulnerability discovered by Gjoko 'LiquidWorm' Krstic
@zeroscience


Advisory ID: ZSL-2013-5124
Advisory URL: http://www.zeroscience.mk/en/vulnerabilities/ZSL-2013-5124.php


19.01.2013


---------------------------------------------------------------------------------

C:\Program Files\Wrocklage>sc qc AloahaCPM
[SC] QueryServiceConfig SUCCESS

SERVICE_NAME: AloahaCPM
TYPE : 10 WIN32_OWN_PROCESS
START_TYPE : 2 AUTO_START
ERROR_CONTROL : 0 IGNORE
BINARY_PATH_NAME : "C:\Program Files\Wrocklage\AloahaCredentialProviderService.exe"
LOAD_ORDER_GROUP :
TAG : 0
DISPLAY_NAME : Aloaha Credential Provider Monitor
DEPENDENCIES :
SERVICE_START_NAME : LocalSystem

C:\Program Files\Wrocklage>cacls AloahaCredentialProviderService.exe
C:\Program Files\Wrocklage\AloahaCredentialProviderService.exe NT AUTHORITY\SYSTEM:(ID)F
Everyone:(ID)F
BUILTIN\Administrators:(ID)F
BUILTIN\Users:(ID)R


C:\Program Files\Wrocklage>

---------------------------------------------------------------------------------
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