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F-Secure Vulnerability Information :
Microsoft Telnet Client Information Disclosure Weakness

[Summary] | [Detailed Description] | [Solution] | [CVE Reference]

Report ID:SA15690
Source:Secunia
Date of Discovery:14.06.2005
Criticality:Critical
Affects:

Microsoft Windows Server 2003 Datacenter Edition
Microsoft Windows Server 2003 Enterprise Edition
Microsoft Windows Server 2003 Standard Edition
Microsoft Windows Server 2003 Web Edition
Microsoft Windows XP Home Edition
Microsoft Windows XP Professional

Compromise From:From remote
Compromise Type:Exposure of system information
Summary

A vulnerability has been reported in Microsoft Windows, which can be exploited by malicious people to gain knowledge of various information.

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Detailed Description

A vulnerability has been reported in Microsoft Windows, which can be exploited by malicious people to gain knowledge of various information.

The problem is caused due to a design error in the Telnet client when handling the NEW-ENVIRON
command. This can be exploited to gain knowledge of the session variables for a user, who has an open connection to a malicious Telnet server.

Successful exploitation requires that a user e.g. visits a malicious web site or is tricked into clicking a specially crafted link.

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Solution

Apply patches.

Microsoft Windows XP (requires SP1 or SP2):
http://www.microsoft.com/downloads/details.aspx?FamilyId=B8BA775E-E9A7-47E9-81A9-A68A71B9FAAC

Microsoft Windows XP 64-Bit Edition for Itanium (requires SP1):
http://www.microsoft.com/downloads/details.aspx?FamilyId=C6161D9E-1672-479E-8BAF-754A64DFAB47

Microsoft Windows XP 64-Bit Edition Version 2003 for Itanium :
http://www.microsoft.com/downloads/details.aspx?FamilyId=C23A4E16-E228-4A80-A4CB-9DCEF462B97A

Microsoft Windows XP Professional x64 Edition:
http://www.microsoft.com/downloads/details.aspx?FamilyId=B281550B-8FAE-4FF3-9BB7-E4BA325779B9

Microsoft Windows Server 2003:
http://www.microsoft.com/downloads/details.aspx?FamilyId=22095E78-A559-40EA-8B65-9C727F4E752F

Microsoft Windows Server 2003 for Itanium-based systems:
http://www.microsoft.com/downloads/details.aspx?FamilyId=C23A4E16-E228-4A80-A4CB-9DCEF462B97A

Microsoft Windows Server 2003 x64 Edition:
http://www.microsoft.com/downloads/details.aspx?FamilyId=DCC6840F-E626-4266-A63A-CDDEC0EC44D6

Microsoft Windows Services for UNIX 3.5 (running on Windows 2000):
http://www.microsoft.com/downloads/details.aspx?FamilyId=7c3dd615-b82d-4520-9c3a-376283b01d5b

Microsoft Windows Services for UNIX 3.0 (running on Windows 2000):
http://www.microsoft.com/downloads/details.aspx?FamilyId=8eaad650-54db-44bc-ac9b-fc8a50f5a3b5

Microsoft Windows Services for UNIX 2.2 (running on Windows 2000):
http://www.microsoft.com/downloads/details.aspx?FamilyId=32c4e286-2c4d-491a-9e05-4ca0b055d5dc

Microsoft Windows Services for UNIX 2.1 (running on Windows 2000):
http://www.microsoft.com/downloads/details.aspx?FamilyId=a41c701c-c0bb-40b3-88c5-ccc484202b2c

Microsoft Windows Services for UNIX 2.0 (running on Windows 2000):
http://www.microsoft.com/downloads/details.aspx?FamilyId=bda20bf9-6abf-487d-9334-c75fd7227274

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CVE Reference
CVE-2005-1205
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F-Secure Corporation