Secunia Research: Adobe Reader / Acrobat External Graphics State (ExtGState) Object Use-After-Free Vulnerability

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                    Secunia Research 12/01/2016              

   Adobe Reader / Acrobat External Graphics State (ExtGState) Object
                   Use-After-Free 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

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1) Affected Software


* Adobe Reader / Acrobat DC (Continuous) versions 15.009.20077 and
  prior
* Adobe Reader / Acrobat DC (Classic) versions 15.009.20077 and prior
* Adobe Reader / Acrobat XI versions 11.0.13 and prior

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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 Adobe Reader and
Adobe Acrobat, which can be exploited by malicious people to
compromise a user's system.

The vulnerability is caused due to a use-after-free error when
handling External Graphics State (ExtGState) object, which can be
exploited to corrupt memory.

Successful exploitation may allow execution of arbitrary code.

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4) Solution 

Update to version 15.010.20056, 15.006.30119, or 11.0.14.

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5) Time Table

30/09/2015 - Vendor notified.
01/10/2015 - Vendor provides January 2016 as intended fix date.
12/01/2016 - Release of vendor patch and publication of Secunia
             Advisory.

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6) Credits 

Discovered by Behzad Najjarpour Jabbari, Secunia Research
at Flexera Software.

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7) References


The Common Vulnerabilities and Exposures (CVE) project has assigned
the CVE-2016-0940 identifier for the vulnerability.
 
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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/

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9) Verification 

Please verify this advisory by visiting the Secunia website:
http://secunia.com/secunia_research/2016-1/

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

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