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AUSCERT External Security Bulletin Redistribution
Microsoft Security Bulletin MS15-039 - Important
15 April 2015
AusCERT Security Bulletin Summary
Product: Microsoft Windows
Operating System: Windows
Impact/Access: Access Confidential Data -- Remote with User Interaction
CVE Names: CVE-2015-1646
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Microsoft Security Bulletin MS15-039 - Important
Vulnerability in XML Core Services Could Allow Security Feature Bypass
Published: April 14, 2015
This security update resolves a vulnerability in Microsoft Windows. The
vulnerability could allow security feature bypass if a user clicks a specially
crafted link. In all cases, however, an attacker would have no way to force
users to click a specially crafted link; an attacker would have to convince
users to click the link, typically by way of an enticement in an email or
Instant Messenger message.
This security update for Microsoft XML Core Services 3.0 is rated Important
for all supported editions of Windows Server 2003, Windows Vista, Windows
Server 2008, Windows 7, and Windows Server 2008 R2. For more information, see
the Affected Software section.
Windows Server 2003
Windows Server 2003 Service Pack 2
Windows Server 2003 x64 Edition Service Pack 2
Windows Server 2003 with SP2 for Itanium-based Systems
Windows Vista Service Pack 2
Windows Vista x64 Edition Service Pack 2
Windows Server 2008
Windows Server 2008 for 32-bit Systems Service Pack 2
Windows Server 2008 for x64-based Systems Service Pack 2
Windows Server 2008 for Itanium-based Systems Service Pack 2
Windows 7 for 32-bit Systems Service Pack 1
Windows 7 for x64-based Systems Service Pack 1
Windows Server 2008 R2
Windows Server 2008 R2 for x64-based Systems Service Pack 1
Windows Server 2008 R2 for Itanium-based Systems Service Pack 1
Server Core installation option
Windows Server 2008 for 32-bit Systems Service Pack 2 (Server Core installation)
Windows Server 2008 for x64-based Systems Service Pack 2 (Server Core installation)
Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation)
MSXML3 Same Origin Policy SFB Vulnerability - CVE-2015-1646
A same-origin policy security feature bypass vulnerability exists in Microsoft
XML Core Services (MSXML) whereby cross-domain data access could be possible
in a document type declaration (DTD) scenario. An attacker who successfully
exploited this vulnerability could access sensitive user information, such as
username or password and files on the hard drive.
In an email attack scenario, an attacker could exploit the vulnerability by
sending a specially crafted link to the user and by convincing the user to
click the link. In a web-based attack scenario, an attacker could host a
website that is used to attempt to exploit the vulnerability. In all cases,
however, an attacker would have no way to force users to open a specially
crafted link; an attacker would have to convince users to click the link,
typically by way of an enticement in an email or Instant Messenger message.
The update addresses the vulnerability by correcting how Microsoft XML Core
services enforces the same-origin policy in a DTD scenario.
Microsoft received information about this vulnerability through coordinated
vulnerability disclosure. When this security bulletin was issued, Microsoft
had not received any information to indicate that this vulnerability had been
publicly used to attack customers.
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