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AUSCERT External Security Bulletin Redistribution
ESB-2008.0793 -- [Win]
MS08-048 - Security Update for Outlook Express and Windows Mail
13 August 2008
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AusCERT Security Bulletin Summary
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Product: Windows Mail
Microsoft Outlook Express 6 Service Pack 1
Microsoft Outlook Express 6
Microsoft Outlook Express 5.5 Service Pack 2
Publisher: Microsoft
Operating System: Windows Server 2008
Windows Server 2003
Windows Vista
Windows XP
Windows 2000
Impact: Access Confidential Data
Access: Remote/Unauthenticated
CVE Names: CVE-2008-1448
Original Bulletin:
http://www.microsoft.com/technet/security/bulletin/ms08-048.mspx
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Microsoft Security Bulletin MS08-048 - Important
Security Update for Outlook Express and Windows Mail (951066)
Published: August 12, 2008
Version: 1.0
General Information
Executive Summary
This security update resolves a privately reported vulnerability in
Outlook Express and Windows Mail. The vulnerability could allow
information disclosure if a user visits a specially crafted Web page
using Internet Explorer. Users whose accounts are configured to have
fewer user rights on the system could be less impacted than users who
operate with administrative user rights.
This security update is rated Important for supported editions of
Windows XP and Windows Vista and rated Low for supported editions of
Windows Server 2003 and Windows Server 2008. 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
Microsoft Outlook Express 5.5 Service Pack 2
Microsoft Outlook Express 6 Service Pack 1
Microsoft Outlook Express 6
Windows Mail
Vulnerability Information
URL Parsing Cross-Domain Information Disclosure Vulnerability -
CVE-2008-1448
An information disclosure vulnerability exists in Outlook Express and
Windows Mail because the MHTML protocol handler incorrectly interprets
MHTML URL redirections that could potentially bypass Internet Explorer
domain restrictions when returning MHTML content. An attacker could
exploit the vulnerability by constructing a specially crafted Web
page. If the user viewed the Web page through Internet Explorer, the
vulnerability could potentially allow information disclosure. An
attacker who successfully exploited this vulnerability could read data
from another Internet Explorer domain or the local computer.
Workarounds for URL Parsing Cross-Domain Information Disclosure
Vulnerability - CVE-2008-1448
Lockdown the MHTML protocol handler
Disable the MHTML protocol handler.
Set Internet and Local intranet security zone settings to High to prompt
before running Active Scripting in these zones
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Australian Computer Emergency Response Team
The University of Queensland
Brisbane
Qld 4072
Internet Email: auscert@auscert.org.au
Facsimile: (07) 3365 7031
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