Operating System:

[Win]

Published:

09 June 2015

Protect yourself against future threats.

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2015.1491
         MS15-061 - Vulnerabilities in Windows Kernel-Mode Drivers
               Could Allow Elevation of Privilege (3057839)
                                9 June 2015

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

Product:           Microsoft Windows
Publisher:         Microsoft
Operating System:  Windows
Impact/Access:     Access Confidential Data -- Existing Account            
                   Administrator Compromise -- Remote with User Interaction
Resolution:        Patch/Upgrade
CVE Names:         CVE-2015-2360 CVE-2015-1768 CVE-2015-1727
                   CVE-2015-1726 CVE-2015-1725 CVE-2015-1724
                   CVE-2015-1723 CVE-2015-1722 CVE-2015-1721
                   CVE-2015-1720 CVE-2015-1719 

Original Bulletin: 
   https://technet.microsoft.com/en-us/library/security/MS15-061

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Bulletin Number:	MS15-061
Bulletin Title:		Vulnerabilities in Windows Kernel-Mode Drivers
			Could Allow Elevation of Privilege
Severity:		Important
KB Article:		3057839
Version:		1.0
Published Date:		June 9, 2015

Executive Summary

This security update resolves vulnerabilities in Microsoft Windows. The
most severe of these vulnerabilities could allow elevation of privilege if
an attacker logs on to the system and runs a specially crafted application
in kernel mode. An attacker could then install programs; view, change,
or delete data; or create new accounts with full user rights.

This security update is rated Important for all supported releases of
Windows.

Affected Software

Windows Server 2003
Windows Vista
Windows Server 2008
Windows 7
Windows Server 2008 R2
Windows 8 and Windows 8.1
Windows Server 2012 and Windows Server 2012 R2
Windows RT and Windows RT 8.1

Vulnerability Information

Microsoft Windows Kernel Information Disclosure Vulnerability - CVE-2015-1719

An information disclosure vulnerability exists when the Windows kernel-mode
driver improperly handles buffer elements under certain conditions, allowing
an attacker to request the contents of specific memory addresses. An attacker
who successfully exploited this vulnerability could then potentially read
data that is not intended to be disclosed. This vulnerability would not allow
an attacker to execute code or to elevate their user rights directly, but it
could be used to obtain information in an attempt to further compromise the
affected system. Workstations and servers are primarily at risk. Servers
could be at more risk if administrators allow users to log on to servers
and to run programs. However, best practices strongly discourage this.

To exploit this vulnerability an attacker must have valid logon credentials
and be able to execute programs on the system. The security update addresses
the vulnerability by correcting how the Windows kernel-mode driver validates
memory addresses.

Microsoft received information about this vulnerability through coordinated
vulnerability disclosure. When this security bulletin was originally
issued Microsoft had not received any information to indicate that this
vulnerability had been publicly used to attack customers.

Microsoft Windows Kernel Use After Free Vulnerability - CVE-2015-1720

An elevation of privilege vulnerability exists when the Windows kernel-mode
driver improperly frees an object in memory that an attacker could use
to execute arbitrary code with elevated permissions. An attacker who
successfully exploited this vulnerability could run arbitrary code in
kernel mode. An attacker could then install programs; view, change, or
delete data; or create new accounts with full administrative rights.

To exploit this vulnerability an attacker would first have to log on to
the system or convince a logged-on user to execute a specially crafted
application. Workstations and terminal servers are primarily at risk. The
update addresses the vulnerability by changing how certain objects are
handled in memory.

Microsoft received information about this vulnerability through coordinated
vulnerability disclosure. When this security bulletin was originally
issued Microsoft had not received any information to indicate that this
vulnerability had been publicly used to attack customers.

Win32k Null Pointer Dereference Vulnerability - CVE-2015-1721

An elevation of privilege vulnerability exists in the Windows kernel-mode
driver due to insufficient validation of certain data passed from user
mode. An attacker who successfully exploited this vulnerability could run
arbitrary code in kernel mode. An attacker could then install programs;
view, change, or delete data; or create new accounts with full user rights.

The update addresses the vulnerability by ensuring that the kernel-mode
driver properly validates data passed from user mode.

Microsoft received information about this vulnerability through coordinated
vulnerability disclosure. When this security bulletin was originally
issued Microsoft had not received any information to indicate that this
vulnerability had been publicly used to attack customers

Multiple Microsoft Windows Kernel Vulnerabilities

Multiple elevation of privilege vulnerabilities exist in the Windows
kernel-mode driver when it accesses an object in memory that has either
not been correctly initialized or deleted. The vulnerabilities may corrupt
memory in such a way that an attacker could gain elevated privileges on
a targeted system.

An authenticated attacker who successfully exploited these vulnerabilities
could acquire elevated privileges. An attacker could then install programs;
view, change, or delete data; or create new accounts with full administrative
rights.
To exploit the vulnerabilities, an attacker would first have to log on
to the system. An attacker could then run a specially crafted application
designed to increase privileges. The update addresses the vulnerabilities
by correcting how the kernel-mode driver handles objects in memory.

Vulnerability title							CVE number	Publicly disclosed	Exploited
Microsoft Windows Kernel Bitmap Handling Use After Free Vulnerability	CVE-2015-1722	No			No
Microsoft Windows Station Use After Free Vulnerability			CVE-2015-1723	No			No
Microsoft Windows Kernel Object Use After Free Vulnerability		CVE-2015-1724	No			No
Microsoft Windows Kernel Brush Object Use After Free Vulnerability	CVE-2015-1726	No			No

Multiple Windows Kernel Buffer Overflow Vulnerabilities

Multiple elevation of privilege vulnerabilities exist in the Windows
kernel-mode driver when it improperly validates user input. An attacker who
successfully exploited these vulnerabilities could gain elevated privileges
on a targeted system.
An authenticated attacker who successfully exploited these vulnerabilities
could acquire elevated privileges. An attacker could then install programs;
view, change, or delete data; or create new accounts with full administrative
rights.
To exploit these vulnerabilities, an attacker would first have to log on
to the system. An attacker could then run a specially crafted application
designed to increase privileges. The update addresses the vulnerabilities
by correcting how the kernel-mode driver validates user input.

Vulnerability title				CVE number	Publicly disclosed	Exploited

Win32k Buffer Overflow Vulnerability		CVE-2015-1725	No			No

Win32k Pool Buffer Overflow Vulnerability	CVE-2015-1727	No			No

Multiple Win32k Memory Corruption Elevation of Privilege Vulnerabilities

An elevation of privilege vulnerability exists when the Windows kernel-mode
driver, Win32k.sys, fails to properly free memory. An attacker who
successfully exploited this vulnerability could execute arbitrary code
within the context of another user. If that other user has elevated rights,
an attacker could then install programs; view, change, or delete data;
or create new accounts with full user rights.

To exploit this vulnerability, an attacker would first have to log on to
the system. An attacker could then run a specially crafted application
designed to increase privileges. The update addresses the vulnerability by
correcting how that the Windows kernel-mode driver handles objects in memory.

Vulnerability title						CVE number	Publicly disclosed	Exploited
Win32k Memory Corruption Elevation of Privilege Vulnerability	CVE-2015-1768	No			No
Win32k Elevation of Privilege Vulnerability			CVE-2015-2360	No			Yes

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