Summary: FX Client is an offline application for e-banking that is intended only
for legal entities.
Desc: The application 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' and 'Users' group, for the 'RichClient.exe'
and 'fxclient.exe' binary files making them world-writable. After you replace the
binary with your rootkit, on reboot you get SYSTEM privileges.
Tested on: Microsoft Windows 7 Ultimate SP1 (EN) 32/64bit
Microsoft Windows 7 Professional SP1 (EN) 32/64bit
Microsoft Windows XP Professional SP3 (EN) 32bit
Vulnerability discovered by Gjoko 'LiquidWorm' Krstic
@zeroscience