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Adobe Animate 15.2.1.95 Buffer Overflow

Adobe Animate 15.2.1.95 Buffer Overflow
Posted Dec 15, 2016
Authored by hyp3rlinx | Site hyp3rlinx.altervista.org

Adobe Animate versions 15.2.1.95 and below suffer from a buffer overflow vulnerability.

tags | exploit, overflow
advisories | CVE-2016-7866
SHA-256 | deefce1ffd423d6fa926e51b041c856564c9488d18f7afd4320d96725b9f2438

Adobe Animate 15.2.1.95 Buffer Overflow

Change Mirror Download
[+] Credits: John Page aka hyp3rlinx

[+] Website: hyp3rlinx.altervista.org

[+] Source:
http://hyp3rlinx.altervista.org/advisories/ADOBE-ANIMATE-MEMORY-CORRUPTION-VULNERABILITY.txt

[+] ISR: ApparitionSec



Vendor:
=============
www.adobe.com



Product(s):
=============================
Adobe Animate
15.2.1.95 and earlier versions

Adobe Animate (formerly Adobe Flash Professional, Macromedia Flash, and
FutureSplash Animator) is a multimedia authoring and computer
animation program developed by Adobe Systems.



Platforms:
===================
Windows / Macintosh



Vulnerability Type:
=======================================
Critical Memory Corruption Vulnerability



CVE Reference:
==============
CVE-2016-7866
APSB16-38



Vulnerability Details:
=====================
Adobe Animate suffers from a Buffer Overflow when creating .FLA files with
ActionScript Classes that use overly long Class names.
This causes memory corruption leading to possible arbitrary code execution
upon opening a maliciously created .Fla Flash file.


Reproduction / POC:


1) Create FLA with overly long Class name in FLA Class publish properties
input field.
2) Save and close
3) Reopen FLA, click edit to open the .as script file
4) "ctrl + s" to save then boom.... access violation


Distributed:
Create new ".as" ActionScript 3 (AS3) file and give it very long class name
in input field then hit "Ctrl+s" to save..
you will crash IDE, next way described is ONE way how attackers can
distribute malicious .FLA

Abusing JSFL, The Flash JavaScript application programming interface
(JavaScript API or JSAPI).

1) Create following .JSFL file

fl.getDocumentDOM().save();
fl.getDocumentDOM().testMovie();

2) Create a MovieClip stored in FLA library with a very long class name
that extends MovieClip and export
it for ActionScript etc...


3) Drag the MovieClip to the stage


4) Bundle FLA/JSFL file, make avail for download as example on how to use
JSFL to call save() / publish() functions.


User opens .FLA, runs harmless looking JSFL code then BOOM!



Reference:
https://helpx.adobe.com/security/products/animate/apsb16-38.html




Disclosure Timeline:
=====================================
Vendor Notification: May 28, 2016
December 13, 2016 : Public Disclosure




Exploitation Technique:
=======================
Local




Severity Level:
================
High



[+] Disclaimer
The information contained within this advisory is supplied "as-is" with no
warranties or guarantees of fitness of use or otherwise.
Permission is hereby granted for the redistribution of this advisory,
provided that it is not altered except by reformatting it, and
that due credit is given. Permission is explicitly given for insertion in
vulnerability databases and similar, provided that due credit
is given to the author. The author is not responsible for any misuse of the
information contained herein and accepts no responsibility
for any damage caused by the use or misuse of this information. The author
prohibits any malicious use of security related information
or exploits by the author or elsewhere.

hyp3rlinx
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