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[INFIGO 2008-01-06]: McAfee E-Business Server Remote Preauth Code Execution / DoS

              INFIGO IS Security Advisory #ADV-2008-01-06

Title: McAfee E-Business Server Remote Preauth Code Execution / DoS
Advisory ID: INFIGO-2008-01-06
Date: 2008-01-09
Advisory URL: http://www.infigo.hr/en/in_focus/advisories/INFIGO-2008-01-06
Impact: Remote code execution
Risk Level: High
Vulnerability Type: Remote

==[ Overview

McAfee E-Business Server guards sensitive corporate data with
PGP 128-bit encryption and authentication. McAfee E-Business Server supports
variety of platforms and security certificates.

==[ Vulnerability

During an audit of McAfee E-Business Server, we have discovered a
in the administration interface (TCP port 1718).
It is possible to crash McAfee E-Business Server during the authentication
When a malformed (oversized) initial authentication packet is sent to
E-Business Server,
the server will crash, and will have to be manually restarted.

A malformed authentication packet is shown below:
"\x01\x3f\x2f\x05\x25\x2a" + "A" * 69953

McAfee further researched the vulnerability and confirmed that it allows an
to also remotely execute code.

==[ Affected Version

The vulnerability has been identified in the latest available McAfee
E-Business Server 8.5.2, and it was successfully tested on Windows and Linux
Previous versions are believed to be vulnerable as well.

==[ Fix

The vendor has addressed this vulnerability with E-Business server patch
on January 8th, 2008.

Vendor advisory and update link:

==[ PoC Exploit


==[ Vendor status

11.28.2007 - Initial contact
11.29.2007 - Initial vendor response
11.30.2007 - Vendor response
12.03.2007 - Vendor status update
12.10.2007 - Vendor status update
12.17.2007 - Vendor status update
01.07.2008 - Vendor status update
01.09.2008 - Coordinated public disclosure

==[ Credits

Vulnerability discovered by Leon Juranic <leon.juranic@xxxxxxxxx>.

==[ INFIGO IS Security Contact


WWW : http://www.infigo.hr/en/
E-mail : infocus@xxxxxxxxx