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Kerio Personal Firewall vulnerable to buffer overflow

Vulnerability Note VU#454716

Original Release Date: 2003-05-12 | Last Revised: 2003-05-13


Kerio Personal Firewall contains a buffer overflow that may allow a remote attacker to execute arbitrary code. An exploit for this vulnerability is publicly available.


Kerio Technologies Inc. describes the Kerio Personal Firewall as follows:

Kerio Personal Firewall (KPF) is a software agent that builds a barrier between your personal computer and the Internet. KPF is designed to protect your PC against attacks from both the Internet, and other computers in the local network.
Core Security Technologies discovered a buffer overflow vulnerability in the Kerio Personal Firewall. The vulnerability exists in a portion of code responsible for setting up encrypted administrator sessions for remote administration of the firewall. Note that the buffer overflow occurs prior to any authentication taking place. For further technical details, please see the Core Security Technologies advisory.


A remote attacker may be able to execute arbitrary code with the privileges of the Kerio Personal Firewall.


Kerio Technologies Inc. has released Kerio Personal Firewall version 2.1.5 to address this vulnerability. Until you can upgrade, you may wish to disable the remote administration feature.

Vendor Information


Kerio Technologies Inc. Affected

Updated:  May 12, 2003



Vendor Statement

We have not received a statement from the vendor.

Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.


Please see the release history entry for version 2.1.5.

If you have feedback, comments, or additional information about this vulnerability, please send us email.

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This vulnerability was discovered by Emiliano Kargieman, Hernán Gips, and Javier Burroni of Core Security Technologies.

This document was written by Ian A Finlay.

Other Information

CVE IDs: CVE-2003-0220
Severity Metric: 14.06
Date Public: 2003-04-28
Date First Published: 2003-05-12
Date Last Updated: 2003-05-13 16:59 UTC
Document Revision: 16

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