Privacyware Privatefirewall 7.0 Unquoted Service Path Privilege Escalation


Vendor: PWI, Inc.
Product web page: http://www.privacyware.com
Affected version: 7.0.30.3


Summary: Privatefirewall multi-layered endpoint security software protects
32 and 64 bit Windows desktops and servers from malware and unauthorized use.
Personal firewall, packet inspection, URL filtering, anti-logger, process
monitor, and application/system behavior modeling and anomaly detection
components stop hackers, spyware, viruses and other forms of malware before
they can cause damage.

Desc: Privatefirewall suffers from an unquoted search path issue impacting
the Core Service 'PFNet' service for Windows deployed as part of Privatefirewall
bundle. This could potentially allow an authorized but non-privileged local
user to execute arbitrary code with elevated privileges on the system. A
successful attempt would require the local user to be able to insert their
code in the system root path undetected by the OS or other security applications
where it could potentially be executed during application startup or reboot.
If successful, the local users code would execute with the elevated privileges
of the application.

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


Vulnerability discovered by Gjoko 'LiquidWorm' Krstic
                            @zeroscience


Advisory ID: ZSL-2014-5209
Advisory URL: http://www.zeroscience.mk/en/vulnerabilities/ZSL-2014-5209.php


09.11.2014

---


C:\Users\user>sc qc PFNet
[SC] QueryServiceConfig SUCCESS

SERVICE_NAME: PFNet
        TYPE               : 10  WIN32_OWN_PROCESS
        START_TYPE         : 2   AUTO_START
        ERROR_CONTROL      : 1   NORMAL
        BINARY_PATH_NAME   : C:\Program Files (x86)\Privacyware\Privatefirewall 7.0\pfsvc.exe
        LOAD_ORDER_GROUP   : TDI
        TAG                : 0
        DISPLAY_NAME       : Privacyware network service
        DEPENDENCIES       : RpcSs
        SERVICE_START_NAME : LocalSystem


--

C:\Users\user>icacls "C:\Program Files (x86)\Privacyware\Privatefirewall 7.0\pfsvc.exe"
C:\Program Files (x86)\Privacyware\Privatefirewall 7.0\pfsvc.exe NT AUTHORITY\SYSTEM:(I)(F)
                                                                 BUILTIN\Administrators:(I)(F)
                                                                 BUILTIN\Users:(I)(RX)

Successfully processed 1 files; Failed processing 0 files


--