Secunia Research: Microsoft Windows Type 1 Font Processing Vulnerability

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                    Secunia Research 2017/05/22

	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

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1) Affected Software

* Microsoft Windows 7
* Microsoft Windows 8.1
* Microsoft Windows Server 2008

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2) Severity

Rating: Moderately critical
Impact: Denial of Service
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 cause a DoS
(Denial of Service).

The vulnerability is caused due to an error within the AMTFD.dll 
when processing Type 1 fonts, which can be exploited to cause a 
stack exhaustion.

The vulnerability is confirmed on a full patched version of Windows 7 
Professional, 8.1, and Server 2008 (AMTFD.dll version 5.1.2.251).

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4) Solution

No official solution is currently available.

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5) Time Table

2017/03/08 - Vendor notified about vulnerability.
2017/03/08 - Vendor response.
2017/03/10 - Vendor asks for additional information as they could
             not reproduce the issue.
2017/03/14 - Vendor was provided with additional information and
             reproduction details.
2017/03/15 - Vendor successfully reproduced the issue.
2017/04/11 - Vendor replies that the issue is considered local DoS
             without a remote attack vector and "[..] does not meet
             the bar for servicing down level. [..]"
2017/04/11 - Communication concerning remote vectors.
2017/04/12 - Fommunication concerning remote vectors.
2017/04/21 - Vendor notified about preliminary release date for
             Secunia Advisory SA75557 April 25, 2017 as the vendor
             does not outline meeting the Flexera Software disclosure
             policy timeline.
2017-04-25 - Release of Secunia Advisory SA75557 as vendor did still
             not outline meeting our disclosure policy.
2017-05-08 - Release of Secunia Research blog.
2017-05-19 - Update of Secunia Advisory SA75557 to add further
             affected operating systems.
2017-05-22 - Public disclosure of Research Advisory.

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6) Credits

Behzad Najjarpour Jabbari, Secunia Research at Flexera Software

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7) References

Currently no CVE identifier is assigned.

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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.

https://secuniaresearch.flexerasoftware.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

https://secuniaresearch.flexerasoftware.com/advisories/

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9) Verification

Please verify this advisory by visiting the Secunia website:
https://secuniaresearch.flexerasoftware.com/secunia_research/2017-12/

Complete list of vulnerability reports published by Secunia Research:
https://secuniaresearch.flexerasoftware.com/secunia_research/

Secunia Research Blog:
http://blogs.flexerasoftware.com/secunia-research/2017/05/unpatched-
denial-of-service-vulnerability-within-microsoft-windows-different-
perspective.html

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