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Article ID: 900934 - Last Review: July 8, 2010 - Revision: 2.1

INTRODUCTION

Microsoft security update 896428 (MS05-033) limits the environment variables that the Telnet client can disclose in Microsoft Windows Server 2003 and in Microsoft Windows XP. However, the security update also adds a new registry key that lets you specify additional environment variables that the Telnet client can disclose.

MORE INFORMATION


Security update 896428 adds the following registry subkey:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\TelnetClient\AllowedEnvVariables
By default, the Telnet client lets the server request only the following environment variables:
  • USER
  • DISPLAY
  • SYSTEMTYPE
  • ACCT
  • JOB
  • PRINTER
  • SFUTLNTMODE
  • SFUTLNTVER
You can use the AllowedEnvVariables registry key to specify additional environment variables that can be disclosed by the Telnet client. The new key is created as a MULTI_SZ registry value.
Note This is a "FAST PUBLISH" article created directly from within the Microsoft support organization. The information contained herein is provided as-is in response to emerging issues. As a result of the speed in making it available, the materials may include typographical errors and may be revised at any time without notice. See Terms of Use (http://go.microsoft.com/fwlink/?LinkId=151500) for other considerations.

APPLIES TO
  • Microsoft Windows XP Home Edition
  • Microsoft Windows XP Media Center Edition 2005 Update Rollup 2
  • Microsoft Windows XP Professional
  • Microsoft Windows XP Tablet PC Edition
  • Microsoft Windows Server 2003, Enterprise Edition (32-bit x86)
  • Microsoft Windows Server 2003, Standard Edition (32-bit x86)
  • Microsoft Windows XP Professional x64 Edition
  • Microsoft Security Essentials
Keywords: 
kbsecurity kbtshoot kbinfo KB900934
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