BugTraq
Kerio Fake 'iphlpapi' DLL injection Vulnerability Jan 01 2007 01:05PM
Matousec - Transparent security Research (research matousec com)
Hello,

We would like to inform you about a vulnerability Sunbelt Kerio Personal Firewall:

Description:

When Sunbelt Kerio Personal Firewall (SKPF) loads dependant modules, it relies on the operating system. System library
iphlpapi.dll is located in the system directory but the main SKPF service, which requires and loads this DLL, is located
in the installation directory of SKPF. This is why it tries to find iphlpapi.dll in its installation directory at first
and then, if it is not found in this directory, it tries to find it in the system directory. Moreover, it is possible to
create new files in the installation directory of SKPF. A malicious application can create a fake iphlpapi.dll in the
installation directory of SKPF, which will be loaded by the operating system into the SKPF service during its
initialization. This is how the malicious application is able to execute an arbitrary code inside SKPF service and
bypass any of its security mechanisms.

Vulnerable software:

* Sunbelt Kerio Personal Firewall 4.3.268
* Sunbelt Kerio Personal Firewall 4.3.246
* probably all versions of Sunbelt Kerio Personal Firewall 4
* possibly older versions of Sunbelt Kerio Personal Firewall

More details and a proof of concept including its source code are available here:
http://www.matousec.com/info/advisories/Kerio-Fake-iphlpapi-DLL-injectio
n.php

Regards,

--
Matousec - Transparent security Research
http://www.matousec.com/

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