Operating System:

[Win]

Published:

13 August 2008

Protect yourself against future threats.

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             AUSCERT External Security Bulletin Redistribution

                          ESB-2008.0795 -- [Win]
         MS08-050 - Vulnerability in Windows Messenger Could Allow
                          Information Disclosure
                              13 August 2008

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        AusCERT Security Bulletin Summary
        ---------------------------------

Product:              Windows Messenger 4.7
                      Windows Messenger 5.1
Publisher:            Microsoft
Operating System:     Windows Server 2003
                      Windows XP
                      Windows 2000
Impact:               Access Confidential Data
Access:               Remote/Unauthenticated
CVE Names:            CVE-2008-0082

Original Bulletin:  
  http://www.microsoft.com/technet/security/bulletin/ms08-050.mspx

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Microsoft Security Bulletin MS08-050 - Important

Vulnerability in Windows Messenger Could Allow Information Disclosure
(955702)

   Published: August 12, 2008

   Version: 1.0

General Information

Executive Summary

   This security update resolves a publicly reported vulnerability in
   supported versions of Windows Messenger. As a result of this
   vulnerability, scripting of an ActiveX control could allow information
   disclosure in the context of the logged-on user. An attacker could
   change state, get contact information, and initiate audio and video
   chat sessions without the knowledge of the logged-on user. An attacker
   could also capture the user's logon ID and remotely log on to the
   user's Messenger client impersonating that user.

   This security update is rated Important for all supported editions of
   Microsoft Windows 2000 and Windows XP, and Moderate for all supported
   versions of Windows Server 2003. For more information, see the
   subsection, Affected Software, in this section.

   Recommendation.  Microsoft recommends that customers apply the update
   at the earliest opportunity.

Affected Software

   Windows Messenger 4.7

   Windows Messenger 5.1

Vulnerability Information

Messenger Information Disclosure Vulnerability - CVE-2008-0082

   An information disclosure vulnerability exists in supported versions
   of Windows Messenger. Scripting of a particular ActiveX control,
   Messenger.UIAutomation.1, could allow information disclosure from
   these programs in the context of the logged-on user. An attacker could
   change state, get contact information, and initiate audio and video
   chat sessions without the knowledge of the logged-on user. An attacker
   could also capture the user's logon ID and remotely log on to the
   user's Messenger client as that user.

Workarounds for Messenger Information Disclosure Vulnerability -
CVE-2008-0082

   Configure Internet Explorer to prompt before running Active Scripting
   or to disable Active Scripting in the Internet and Local intranet
   security zone 

   Set Internet and Local intranet security zone settings to "High" to
   prompt before running ActiveX Controls and Active Scripting in these
   zones 

   Set the killbit for the Messenger.UIAutomation.1 control

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===========================================================================
Australian Computer Emergency Response Team
The University of Queensland
Brisbane
Qld 4072

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