Aloaha Credential Provider Monitor 5.0.226 – Local Privilege Escalation
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> --------------------------------------------------------------------------------- |