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Security update 896428 adds a new registry key that lets the Telnet client disclose additional environment variables in Windows Server 2003 and in Windows XP


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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.

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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.

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Keywords: KB900934, kbinfo, kbtshoot, kbsecurity

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Article Info
Article ID : 900934
Revision : 3
Created on : 7/8/2010
Published on : 7/8/2010
Exists online : False
Views : 124