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             AUSCERT External Security Bulletin Redistribution

                               ESB-2010.0513
             Cumulative Security Update for Internet Explorer
                                9 June 2010

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

Product:           Microsoft Internet Explorer 5.01 Service Pack 4
                   Microsoft Internet Explorer 6
                   Microsoft Internet Explorer 6 Service Pack 1
                   Microsoft Internet Explorer 7
                   Microsoft Internet Explorer 8
Publisher:         Microsoft
Operating System:  Windows 2000
                   Windows XP
                   Windows Vista
                   Windows 7
                   Windows Server 2003
                   Windows Server 2008
Impact/Access:     Execute Arbitrary Code/Commands -- Remote with User Interaction
                   Access Confidential Data        -- Remote with User Interaction
                   Cross-site Scripting            -- Remote with User Interaction
Resolution:        Patch/Upgrade
CVE Names:         CVE-2010-1262 CVE-2010-1261 CVE-2010-1260
                   CVE-2010-1259 CVE-2010-1257 CVE-2010-0255

Reference:         ASB-2010.0042.2

Original Bulletin: 
   http://www.microsoft.com/technet/security/Bulletin/MS10-035.mspx

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Microsoft Security Bulletin MS10-035 - Critical

Cumulative Security Update for Internet Explorer (982381)

Version: 1.0

General Information

Executive Summary

  This security update resolves five privately reported vulnerabilities and
  one publicly disclosed vulnerability in Internet Explorer. The most severe
  vulnerabilities could allow remote code execution if a user views 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 Critical for Internet Explorer 6 Service
  Pack 1 on Microsoft Windows 2000 Service Pack 4; Critical for Internet
  Explorer 6, Internet Explorer 7, and Internet Explorer 8 on Windows
  clients; and Moderate for Internet Explorer 6, Internet Explorer 7, and
  Internet Explorer 8 on Windows servers. For more information, see the
  subsection, Affected and Non-Affected Software, in this section.

  The security update addresses these vulnerabilities by modifying the way
  that Internet Explorer handles objects in memory, HTML sanitization, and
  cached content. For more information about the vulnerabilities, see the
  Frequently Asked Questions (FAQ) subsection under the next section,
  Vulnerability Information.

  This security update also addresses the vulnerability first described in
  Microsoft Security Advisory 980088.

Affected Software

  Microsoft Internet Explorer 5.01 Service Pack 4
  Microsoft Internet Explorer 6
  Microsoft Internet Explorer 6 Service Pack 1
  Microsoft Internet Explorer 7
  Microsoft Internet Explorer 8

Vulnerability Information

Cross-Domain Information Disclosure Vulnerability - CVE-2010-0255

  An information disclosure vulnerability exists in the way that Internet
  Explorer caches data and incorrectly allows the cached content to be
  called, potentially bypassing Internet Explorer domain restriction. An
  attacker could exploit the vulnerability by constructing a specially crafted
  Web page that could allow information disclosure if a user viewed the Web
  page. An attacker who successfully exploited this vulnerability could view
  content from the local computer or a browser window in another domain or
  Internet Explorer zone.

toStaticHTML Information Disclosure Vulnerability - CVE-2010-1257

  An information disclosure vulnerability exists in the way that Internet
  Explorer handles content using specific strings when sanitizing HTML. An
  attacker could exploit the vulnerability by constructing a specially crafted
  Web page that could allow information disclosure if a user viewed the Web page.
  An attacker who successfully exploited this vulnerability could inflict
  cross-site scripting on the user, allowing the attacker to execute script in
  the user's security context against a site that is using the toStaticHTML API.

Uninitialized Memory Corruption Vulnerability - CVE-2010-1259

  A remote code execution vulnerability exists in the way that Internet Explorer
  accesses an object that has not been correctly initialized or has been deleted.
  An attacker could exploit the vulnerability by constructing a specially crafted
  Web page. When a user views the Web page, the vulnerability could allow remote
  code execution. An attacker who successfully exploited this vulnerability could
  gain the same user rights as the logged-on user. If a user is logged on with
  administrative user rights, an attacker who successfully exploited this
  vulnerability could take complete control of an affected system. An attacker
  could then install programs; view, change, or delete data; or create new
  accounts with full user rights.

HTML Element Memory Corruption Vulnerability - CVE-2010-1260

  A remote code execution vulnerability exists in the way that Internet Explorer
  accesses an object that has not been correctly initialized or has been deleted
  in the IE8 Developer Toolbar. An attacker could exploit the vulnerability by
  constructing a specially crafted Web page. When a user views the Web page, the
  vulnerability could allow remote code execution. An attacker who successfully
  exploited this vulnerability could gain the same user rights as the logged-on
  user. If a user is logged on with administrative user rights, an attacker who
  successfully exploited this vulnerability could take complete control of an
  affected system. An attacker could then install programs; view, change, or
  delete data; or create new accounts with full user rights.

Uninitialized Memory Corruption Vulnerability - CVE-2010-1261

  A remote code execution vulnerability exists in the way that Internet Explorer
  accesses an object that has not been correctly initialized or has been deleted in
  the IE8 Developer Toolbar. An attacker could exploit the vulnerability by
  constructing a specially crafted Web page. When a user views the Web page, the
  vulnerability could allow remote code execution. An attacker who successfully
  exploited this vulnerability could gain the same user rights as the logged-on
  user. If a user is logged on with administrative user rights, an attacker who
  successfully exploited this vulnerability could take complete control of an
  affected system. An attacker could then install programs; view, change, or
  delete data; or create new accounts with full user rights.

Memory Corruption Vulnerability - CVE-2010-1262

  A remote code execution vulnerability exists in the way that Internet Explorer
  accesses an object that has not been correctly initialized or has been deleted.
  An attacker could exploit the vulnerability by constructing a specially crafted
  Web page. When a user views the Web page, the vulnerability could allow remote
  code execution. An attacker who successfully exploited this vulnerability could
  gain the same user rights as the logged-on user. If a user is logged on with
  administrative user rights, an attacker who successfully exploited this
  vulnerability could take complete control of an affected system. An attacker
  could then install programs; view, change, or delete data; or create new
  accounts with full user rights.

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

Internet Email: auscert@auscert.org.au
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