Secunia Research: Microsoft Windows "LoadUvsTable()" Integer Overflow Vulnerability

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                    Secunia Research 2016/12/14

  Microsoft Windows "LoadUvsTable()" Integer Overflow 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

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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

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2) Severity

Rating: Highly critical
Impact: System access
Where:  From remote

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3) Description of Vulnerability

Secunia Research has discovered a vulnerability in Microsoft Windows,
which can be exploited by malicious people to compromise a vulnerable
system.

The vulnerability is caused due to an integer overflow error within
the "LoadUvsTable()" function (gdi32full.dll) can be exploited to
cause a heap-based buffer overflow via a font file containing a
Unicode Variation Sequences table with a specially crafted
numUnicodeValueRanges value.

Successful exploitation of this vulnerability allows execution of
arbitrary code.

The vulnerability is confirmed on a fully patched Windows 10
Professional (gdi32full.dll version 10.0.10586.420).

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4) Solution

Apply update.
https://technet.microsoft.com/library/security/MS16-147

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5) Time Table

2016/08/04 - Vendor notified about vulnerability.
2016/08/04 - Vendor response.
2016/08/04 - Vendor status update.
2016/11/09  Asked for status update.
2016/11/10 - Vendor status update.
2016/11/14  Replied to vendor.
2016/11/15  Vendor response.
2016/12/13 - Release of Secunia Advisory SA70000.
2016/12/14 - Public disclosure of Secunia Research Advisory.

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6) Credits

Discovered by Hossein Lotfi, Secunia Research at Flexera Software.

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7) References

The Common Vulnerabilities and Exposures (CVE) project has assigned
the CVE-2016-7274 identifier for the vulnerability.

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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/

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9) Verification

Please verify this advisory by visiting the Secunia website:
http://secunia.com/secunia_research/2016-18/

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

Secunia Research Blog at Flexera Software:
http://blogs.flexerasoftware.com/secunia-research/2016/12/microsoft_
windows_loaduvstable_heap_based_buffer_overflow_vulnerability.html

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