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AUSCERT External Security Bulletin Redistribution
ESB-2015.1283
MS15-048: Vulnerabilities in .NET Framework Could Allow
Elevation of Privilege (3057134)
13 May 2015
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AusCERT Security Bulletin Summary
---------------------------------
Product: Microsoft .NET Framework
Publisher: Microsoft
Operating System: Windows
Impact/Access: Increased Privileges -- Remote with User Interaction
Denial of Service -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2015-1673 CVE-2015-1672
Original Bulletin:
https://technet.microsoft.com/en-us/library/security/MS15-048
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MS15-048: Vulnerabilities in .NET Framework Could Allow Elevation of Privilege
(3057134)
Bulletin Number: MS15-048
Bulletin Title: Vulnerabilities in .NET Framework Could Allow Elevation of
Privilege
Severity: Important
KB Article: 3057134
Version: 1.0
Published Date: May 12, 2015
Executive Summary
This security update resolves vulnerabilities in Microsoft .NET Framework. The
most severe of the vulnerabilities could allow elevation of privilege if a
user installs a specially crafted partial trust application.
This security update is rated Important for Microsoft .NET Framework 1.1
Service Pack 1, Microsoft .NET Framework 2.0 Service Pack 2, Microsoft .NET
Framework 3.5, Microsoft .NET Framework 3.5.1, Microsoft .NET Framework 4,
Microsoft .NET Framework 4.5, Microsoft .NET Framework 4.5.1, and Microsoft
.NET Framework 4.5.2 on affected releases of Microsoft Windows. For more
information, see the Affected Software section.
Affected Software
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 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 for x64-based Systems Service Pack 1
Windows Server 2008 R2 for Itanium-based Systems Service Pack 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
Windows Server 2012 R2
Windows RT
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)
[1].NET Framework 4 and .NET Framework 4 Client Profile affected.
[2]This update is available via Windows Update only.
Vulnerability Information
.NET XML Decryption Denial of Service Vulnerability - CVE-2015-1672
A denial of service vulnerability exists in Microsoft .NET Framework that
could allow an unauthenticated attacker to degrade the performance of a
.NET-enabled website and disrupt the availability of applications that use
Microsoft .NET Framework. The vulnerability exists when Microsoft .NET
Framework attempts to decrypt certain specially crafted XML data.
To exploit this vulnerability, an attacker could send specially crafted XML
data to a .NET application with the intention of causing processing recursion
that leads to the denial-of-service condition. Servers running affected
versions of Microsoft .NET Framework are primarily at risk from this
vulnerability. The update addresses the vulnerability by correcting how the
.NET Framework decrypts XML data.
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.
Windows Forms Elevation of Privilege Vulnerability - CVE-2015-1673
An elevation of privilege vulnerability exists in Microsoft .NET Framework
that is caused when .NETs Windows Forms (WinForms) libraries improperly handle
objects in memory. An attacker who successfully exploited the 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. 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.
To exploit this vulnerability, an attacker could use social engineering
tactics to lure a user into installing a specially crafted partial trust
application. Workstations and servers that run partial-trust .NET Framework
applications are primarily at risk from this vulnerability. The update
addresses the vulnerability by correcting how .NET Framework handles objects
in memory.
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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