Adobe Flash - Action Script 3 Byte Array Use-After-Free Vulnerability

Number: AL15-008
Date: July 9, 2015

Purpose

The purpose of this alert is to bring attention to a recently discovered vulnerability in the Actionscript 3 ByteArray class of Adobe Flash Player.  Exploitation of this vulnerability could ultimately allow an attacker to execute arbitrary code on the system.

Assessment

Adobe Flash Player versions 9.0 through 18.0.0.194 contain a use-after-free vulnerability in the AS3 ByteArray.  Attackers exploiting this memory flaw can cause programs to crash and execution of arbitrary code with system privileges.  Attack vectors can include baiting users into visiting sites containing flawed Flash content and through use of specially crafted Microsoft Office documents.

Suggested action

CCIRC recommends that owner/operators utilize Microsoft's Enhanced Mitigation Experience Toolkit (EMET) to help prevent exploitation of this vulnerability.  In particular, Attack Surface Reduction (ASR) can be configured to help restrict Microsoft Office and Internet Explorer from loading the Flash ActiveX control.

References

http://www.symantec.com/connect/app#!/blogs/leaked-flash-zero-day-likely-be-exploited-attackers
http://www.zdnet.com/article/unpatched-flash-exploits-unveiled-in-hacking-team-data-dump/
https://www.kb.cert.org/vuls/id/561288
http://help.adobe.com/en_US/FlashPlatform/reference/actionscript/3/flash/utils/ByteArray.html
https://technet.microsoft.com/en-us/security/jj653751

Note to Readers

In support of Public Safety's mission to build a safe and resilient Canada, CCIRC's mandate is to help ensure the security and resilience of the vital non-federal government cyber systems that underpin Canada's national security, public safety and economic prosperity. As Canada's computer security incident response team, CCIRC is Canada's national coordination centre for the prevention and mitigation of, preparedness for, response to, and recovery from cyber incidents on non-federal government systems. It does this by providing authoritative advice and support, and coordinating information sharing and incident response.

Please note, CCIRC PGP key has recently been updated.
http://www.publicsafety.gc.ca/cnt/ntnl-scrt/cbr-scrt/_fl/CCIRCPublicPGPKey.txt

For general information, please contact Public Safety Canada's Public Affairs division at:

Telephone: 613-944-4875 or 1-800-830-3118
Fax: 613-998-9589
E-mail: ps.communications-communications.sp@canada.ca

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