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Microsoft Windows usp10.dll "GetFontDesc()" Integer Underflow

Microsoft Windows usp10.dll "GetFontDesc()" Integer Underflow
Posted Dec 10, 2015
Authored by Secunia, Hossein Lotfi | Site secunia.com

Secunia Research has discovered a vulnerability in Microsoft Windows, which can be exploited by malicious people to compromise a user's system. The vulnerability is caused due to an integer underflow error within the "GetFontDesc()" function in usp10.dll when processing font files cmap table and can be exploited to cause a heap-based buffer overflow via a font file containing cmap table data with specially crafted offset within encoding records. Successful exploitation allows execution of arbitrary code.

tags | advisory, overflow, arbitrary
systems | windows
advisories | CVE-2015-6130
SHA-256 | d65fab95536006f5a8a8545eff4d02524698f63bed04d5515fe21776d1ea97e1

Microsoft Windows usp10.dll "GetFontDesc()" Integer Underflow

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

Secunia Research 08/12/2015

Microsoft Windows usp10.dll "GetFontDesc()"
Integer Underflow 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 Secunia........................................................8
Verification.........................................................9

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


* Microsoft Windows 7
* Microsoft Windows Server 2008

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

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

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

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

The vulnerability is caused due to an integer underflow error within
the "GetFontDesc()" function in usp10.dll when processing font files
cmap table and can be exploited to cause a heap-based buffer overflow
via a font file containing cmap table data with specially crafted
offset within encoding records.

Successful exploitation allows execution of arbitrary code.

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

Apply update provided by MS15-130.

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

09/10/2015 - Vendor notified.
12/10/2015 - Vendor response.
17/10/2015 - Status update provided by the vendor.
28/10/2015 - Vendor provides December 2015 as intended fix date.
08/12/2015 - Release of vendor patch and public disclosure.

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

Discovered by Hossein Lotfi, Secunia Research (now part of
Flexera Software).

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


The Common Vulnerabilities and Exposures (CVE) project has assigned
the CVE-2015-6130 identifier for the vulnerability.

======================================================================
8) About Secunia (now part of Flexera Software)

In September 2015, Secunia has been acquired by Flexera Software:

https://secunia.com/blog/435/

Secunia offers vulnerability management solutions to corporate
customers with verified and reliable vulnerability intelligence
relevant to their specific system configuration:

http://secunia.com/products/

Secunia also provides a publicly accessible and comprehensive advisory
database as a service to the security community and private
individuals, who are interested in or concerned about IT-security.

http://secunia.com/advisories/

Secunia believes that it is important to support the community and to
do active vulnerability research in order to aid improving the
security and reliability of software in general:

http://secunia.com/secunia_research/

Secunia regularly hires new skilled team members. Check the URL below
to see currently vacant positions:

http://secunia.com/company/jobs/

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

Please verify this advisory by visiting the Secunia website:
http://secunia.com/secunia_research/2015-6/

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

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