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McAfee E-Business Admin Server Invalid Data Length DoS Vulnerability

04.17.07

BACKGROUND

McAfee e-Business Server is used to provide transparent encryption for corporate end users storing and sharing documents. It is composed of two utilities; a command line program that encrypts/decrypts data and manages the keyring, and an administration server that can be used to update user profiles and manage keys remotely. More information can be found on the vendor's web site at the following URL.

http://www.mcafee.com/us/enterprise/products/encryption/ebusiness_server.html

DESCRIPTION

Remote exploitation of a denial of service (DoS) vulnerability in McAfee Inc.'s E-Business Server could allow an attacker to crash the administration server.

Prior to authentication, an attacker can crash the server by sending a malformed authentication packet. The server will read in a length from the packet header, and then attempt to read that many bytes from the buffer. By specifying a large length value and sending a small packet, the server can be caused to read off the end of mapped heap memory. This will trigger an exception that is not handled, and the server will exit.

ANALYSIS

Exploitation of this vulnerability allows an attacker to crash the administration server.

In this situation, the administrator will not be able to configure user profiles, or add/remove/manage keys.

It is important to note that the core functionality of this product is contained within the command line utility.

The command line utility would commonly be used by a web script that needs to encrypt/decrypt data, or by a SMTP gateway that transparently encrypts routed mail. This utility will continue to work regardless of whether the administration server is running or not.

DETECTION

iDefense has confirmed the existence of this vulnerability in McAfee E-Business Server version 8.5.1.101 for Windows. Previous versions may also be affected.

WORKAROUND

iDefense is currently unaware of any workarounds for this issue.

VENDOR RESPONSE

McAfee has addressed this vulnerability with updated packages. More information is available in McAfee's Security Bulletin 612751 at the following URL.

https://knowledge.mcafee.com/SupportSite/dynamickc.do?externalId=612751&command=show&forward=nonthreadedKC

CVE INFORMATION

A Mitre Corp. Common Vulnerabilities and Exposures (CVE) number has not been assigned yet.

DISCLOSURE TIMELINE

02/07/2007 Initial vendor notification
02/07/2007 Initial vendor response
04/17/2007 Coordinated public disclosure

CREDIT

The discoverer of this vulnerability wishes to remain anonymous.

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LEGAL NOTICES

Copyright © 2007 Verisign, Inc.

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Disclaimer: The information in the advisory is believed to be accurate at the time of publishing based on currently available information. Use of the information constitutes acceptance for use in an AS IS condition. There are no warranties with regard to this information. Neither the author nor the publisher accepts any liability for any direct, indirect, or consequential loss or damage arising from use of, or reliance on, this information.