Vulnerability Note VU#561288
Adobe Flash ActionScript 3 ByteArray use-after-free vulnerability
Original Release date: 07 Jul 2015 | Last revised: 11 Jul 2015

Overview
Adobe Flash Player contains a vulnerability in the ActionScript 3 ByteArray class, which can allow a remote, unauthenticated attacker to execute arbitrary code on a vulnerable system.

Description
Adobe Flash Player versions 9.0 through version 18.0.0.194 contain a use-after-free vulnerability in the AS3 ByteArray class. This can allow attacker-controlled memory corruption. Exploit code for this vulnerability is publicly available.

Impact
An attacker can execute arbitrary code in the context of the user running Flash Player. Attacks typically involve enticing a user to visit a web site containing specially-crafted Flash content, or to open a specially-crafted Microsoft Office document.

Solution
Apply an update
This issue is addressed in Flash Player Desktop 18.0.0.203. Please see Adobe Security Bulletin APSB15-16 for more details and fix versions for other platforms.
Do not run untrusted Flash content

To defend against this and other, as yet unknown vulnerabilities, disable Flash in your browser or enable Click-to-Play features. Adobe has also provided instructions for how to uninstall Flash on Windows and Mac platforms.

Use the Microsoft Enhanced Mitigation Experience Toolkit

The Microsoft Enhanced Mitigation Experience Toolkit (EMET) can be used 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.

Vendor Information (Learn More)

VendorStatusDate NotifiedDate UpdatedAdobeAffected06 Jul 201508 Jul 2015If you are a vendor and your product is affected, let
us know.

CVSS Metrics (Learn More)

Group
Score
Vector

Base
7.5
AV:N/AC:L/Au:N/C:P/I:P/A:P

Temporal
7.1
E:H/RL:W/RC:C

Environmental
7.1
CDP:ND/TD:H/CR:ND/IR:ND/AR:ND

References

https://helpx.adobe.com/security/products/flash-player/apsb15-16.html
https://helpx.adobe.com/security/products/flash-player/apsa15-03.html
https://twitter.com/w3bd3vil/status/618168863708962816
http://malware.dontneedcoffee.com/2015/07/hackingteam-flash-0d-cve-2015-xxxx-and.html
http://help.adobe.com/en_US/FlashPlatform/reference/actionscript/3/flash/utils/ByteArray.html
http://blog.trendmicro.com/trendlabs-security-intelligence/unpatched-flash-player-flaws-more-pocs-found-in-hacking-team-leak/
http://www.microsoft.com/emet

Credit

This vulnerability was discovered by HackingTeam.
This document was written by Will Dormann.

Other Information

CVE IDs:
CVE-2015-5119

Date Public:
05 Jul 2015

Date First Published:
07 Jul 2015

Date Last Updated:
11 Jul 2015

Document Revision:
37

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