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AUSCERT External Security Bulletin Redistribution
ESB-2015.2069
Microsoft Security Bulletin MS15-084: Vulnerabilities in XML Core Services
Could Allow Information Disclosure (3080129)
12 August 2015
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AusCERT Security Bulletin Summary
---------------------------------
Product: Microsoft Windows
Microsoft Office
Publisher: Microsoft
Operating System: Windows
Impact/Access: Access Confidential Data -- Remote with User Interaction
Resolution: Patch/Upgrade
CVE Names: CVE-2015-2471 CVE-2015-2440 CVE-2015-2434
Original Bulletin:
https://technet.microsoft.com/en-us/library/security/MS15-084
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Microsoft Security Bulletin MS15-084: Vulnerabilities in XML Core Services
Could Allow Information Disclosure (3080129)
Bulletin Number: MS15-084
Bulletin Title: Vulnerabilities in XML Core Services Could Allow Information
Disclosure
Severity: Important
KB Article: 3080129
Version: 1.0
Published Date: August 11, 2015
Executive Summary
This security update resolves vulnerabilities in Microsoft Windows and
Microsoft Office. The vulnerabilities could allow information disclosure by
either exposing memory addresses if a user clicks a specially crafted link or
by explicitly allowing the use of Secure Sockets Layer (SSL) 2.0. However, in
all cases 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 is rated Important for the following software:
Microsoft XML Core Services 3.0 and Microsoft XML Core Services 6.0 on all
supported releases of Microsoft Windows except Windows 10, which is not
affected.
Microsoft XML Core Services 5.0 on Microsoft Office 2007 Service Pack 3
Microsoft XML Core Services 5.0 on Microsoft InfoPath 2007 Service Pack 3
For more information, see the Affected Software section.
Affected Software
Windows Vista
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
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
Windows 8 and Windows 8.1
Windows 8 for 32-bit Systems
Windows 8 for x64-based Systems
Windows 8.1 for 32-bit Systems
Windows 8.1 for x64-based Systems
Windows Server 2012 and Windows Server 2012 R2
Windows Server 2012
Windows Server 2012 R2
Windows RT and Windows RT 8.1
Windows RT[1]
Windows RT 8.1[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)
Windows Server 2012 (Server Core installation)
Windows Server 2012 R2 (Server Core installation)
Microsoft Office
Microsoft Office Suites and Components
Microsoft Office 2007 Service Pack 3
Other Microsoft Office Software
Microsoft InfoPath 2007 Service Pack 3
Vulnerability Information
Multiple MSXML Information Disclosure Vulnerabilities
Information disclosure vulnerabilities exist when Microsoft XML Core Services
(MSXML) explicitly allows the use of Secure Sockets Layer (SSL) 2.0. An
attacker who successfully exploited these vulnerabilities could decrypt
portions of encrypted network information traffic.
In a man-in-the-middle (MiTM) attack scenario, an attacker could force an
encrypted SSL 2.0 session and then decrypt portions of encrypted network
information traffic. This update resolves the issue by configuring MSXML to
use more secure network protocols by default instead of SSL 2.0.
The following table contains links to the standard entry for each
vulnerability in the Common Vulnerabilities and Exposures list:
Vulnerability title CVE number Publicly disclosed Exploited
MSXML Information Disclosure Vulnerability CVE-2015-2434 No No
MSXML Information Disclosure Vulnerability CVE-2015-2471 No No
MSXML Information Disclosure Vulnerability - CVE-2015-2440
An information disclosure vulnerability exists when Microsoft XML Core
Services (MSXML) exposes memory addresses not intended for public disclosure.
An attacker could combine this information disclosure vulnerability to bypass
Address Space Layout Randomization (ASLR). An attacker who successfully
exploited this vulnerability could potentially read private data. The
vulnerability would not allow an attacker to execute code or to elevate user
rights directly, but the attacker could use it to obtain information in an
attempt to further compromise the affected system.
To exploit the vulnerability, an attacker could host a specially-crafted
website that is designed to invoke MSXML through Internet Explorer. However,
an attacker would have no way to force a user to visit such a website.
Instead, an attacker would typically have to convince a user to either click a
link in an email message or a link in an Instant Messenger request that would
then take the user to the website. The update addresses the vulnerability by
modifying how Microsoft XML Core Services returns data requests.
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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