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Microsoft Exchange Server TNEF Decoding Remote Code Execution Vulnerability

Risk

High

Date Discovered

February 10, 2009

Description

Microsoft Exchange Server is prone to a remote code-execution vulnerability. Remote attackers may exploit this issue by sending maliciously constructed TNEF-encoded email data to vulnerable servers. This issue will be triggered when a user views or previews the malicious email. Successfully exploiting this issue would allow the attacker to execute arbitrary code on an affected computer in the context of the affected application.

Technologies Affected

  • Avaya Messaging Application Server
  • Avaya Messaging Application Server MM 1.1
  • Avaya Messaging Application Server MM 2.0
  • Avaya Messaging Application Server MM 3.0
  • Avaya Messaging Application Server MM 3.1
  • Microsoft Exchange Server 2000
  • Microsoft Exchange Server 2000 SP1
  • Microsoft Exchange Server 2000 SP2
  • Microsoft Exchange Server 2000 SP3
  • Microsoft Exchange Server 2003
  • Microsoft Exchange Server 2003 SP1
  • Microsoft Exchange Server 2003 SP2
  • Microsoft Exchange Server 2007
  • Microsoft Exchange Server 2007 SP 1
  • Microsoft Exchange Server MAPI Client 1.2.1

Recommendations

Run all software as a nonprivileged user with minimal access rights.

To mitigate the impact of a successful exploit, run the affected application as a user with minimal access rights.

Deploy network intrusion detection systems to monitor network traffic for malicious activity.

Deploy NIDS to monitor network traffic for signs of suspicious or anomalous activity. This may help detect malicious actions that an attacker may take after successfully exploiting vulnerabilities in applications. Review all applicable logs regularly.

Implement multiple redundant layers of security.

Since this issue may be leveraged to execute code, we recommend memory-protection schemes, such as nonexecutable stack/heap configurations and randomly mapped memory segments. This tactic may complicate exploit attempts of memory-corruption vulnerabilities.
The vendor has released an advisory along with fixes to address this issue. Please see the references for more information.

Credits

This issue was disclosed by the vendor.
Copyright © Symantec Corporation.
Permission to redistribute this alert electronically is granted as long as it is not edited in any way unless authorized by Symantec Security Response. Reprinting the whole or part of this alert in any medium other than electronically requires permission from secure@symantec.com.

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.
Symantec, Symantec products, Symantec Security Response, and secure@symantec.com are registered trademarks of Symantec Corp. and/or affiliated companies in the United States and other countries. All other registered and unregistered trademarks represented in this document are the sole property of their respective companies/owners.

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