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Microsoft Windows Type 1 Font Processing Privilege Escalation

Microsoft Windows Type 1 Font Processing Privilege Escalation
Posted Dec 15, 2016
Authored by Behzad Najjarpour Jabbari | Site secunia.com

Secunia Research has discovered a vulnerability in Microsoft Windows, which can be exploited by malicious, local users to gain escalated privileges and by malicious people to cause a DoS (Denial of Service). The vulnerability is caused due to an error within the win32k.sys when processing Type 1 fonts, which can be exploited to trigger a NULL pointer dereference and subsequently cause a kernel crash or gain elevated privileges via a specially crafted PFB font. The vulnerability is confirmed on a fully patched Windows 7 Professional (win32k.sys version 6.1.7601.23545).

tags | advisory, denial of service, kernel, local
systems | windows, 7
advisories | CVE-2016-7259
MD5 | feffd2a6827fd6748079e32126b68294

Microsoft Windows Type 1 Font Processing Privilege Escalation

Change Mirror Download
======================================================================

Secunia Research 2016/12/14

Microsoft Windows Type 1 Font Processing Vulnerability

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Table of Contents

Affected Software....................................................1
Severity.............................................................2
Description of Vulnerability.........................................3
Solution.............................................................4
Time Table...........................................................5
Credits..............................................................6
References...........................................................7
About Flexera Software...............................................8
Verification.........................................................9

======================================================================
1) Affected Software

* Microsoft Windows 10
* Microsoft Windows 7
* Microsoft Windows 8.1
* Microsoft Windows RT 8.1
* Microsoft Windows Server 2008
* Microsoft Windows Server 2012
* Microsoft Windows Server 2016
* Microsoft Windows Vista

======================================================================
2) Severity

Rating: Moderately critical
Impact: Privilege escalation, Denial of Service
Where: From remote

======================================================================
3) Description of Vulnerability

Secunia Research has discovered a vulnerability in Microsoft Windows,
which can be exploited by malicious, local users to gain escalated
privileges and by malicious people to cause a DoS (Denial of Service).

The vulnerability is caused due to an error within the win32k.sys
when processing Type 1 fonts, which can be exploited to trigger a
NULL pointer dereference and subsequently cause a kernel crash or
gain elevated privileges via a specially crafted PFB font.

The vulnerability is confirmed on a fully patched Windows 7
Professional (win32k.sys version 6.1.7601.23545).

======================================================================
4) Solution

Apply update.
https://technet.microsoft.com/library/security/MS16-151

======================================================================
5) Time Table

2016/12/01 - Vendor notified about vulnerability.
2016/12/06 - Vendor response.
2016/12/13 - Release of Secunia Advisory SA73777.
2016/12/14 - Public disclosure of Secunia Research Advisory.

======================================================================
6) Credits

Behzad Najjarpour Jabbari, Secunia Research at Flexera Software

======================================================================
7) References

The Common Vulnerabilities and Exposures (CVE) project has assigned
the CVE-2016-7259 identifier for the vulnerability.

======================================================================
8) About Flexera Software

Flexera Software helps application producers and enterprises increase
application usage and the value they derive from their software.


http://www.flexerasoftware.com/enterprise/company/about/

Flexera Software delivers market-leading Software Vulnerability
Management solutions enabling enterprises to proactively identify and
remediate software vulnerabilities, effectively reducing the risk of
costly security breaches.

http://www.flexerasoftware.com/enterprise/products/

Flexera Software supports and contributes to the community in
several ways. We have always believed that reliable vulnerability
intelligence and tools to aid identifying and fixing vulnerabilities
should be freely available for consumers to ensure that users,
who care about their online privacy and security, can stay secure.
Only a few vendors address vulnerabilities in a proper way and help
users get updated and stay secure. End-users (whether private
individuals or businesses) are otherwise left largely alone, and
that is why back in 2002, Secunia Research started investigating,
coordinating disclosure and verifying software vulnerabilities.
In 2016, Secunia Research became a part of Flexera Software
and today our in-house software vulnerability research remains the
core of the Software Vulnerability Management products at
Flexera Software.

http://secunia.com/secunia_research/

The public Advisory database contains sufficient information for
researchers, security enthusiasts, and consumers to lookup individual
products and vulnerabilities and assess, whether they need to take
any actions to secure their systems or whether a given vulnerability
has already been discovered

http://secunia.com/advisories/

======================================================================
9) Verification

Please verify this advisory by visiting the Secunia website:
http://secunia.com/secunia_research/2016-19/

Complete list of vulnerability reports published by Secunia Research:
http://secunia.com/secunia_research/

======================================================================

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