(Pwn2Own) Adobe Flash AS2 LoadVars decode Use-After-Free Remote Code Execution Vulnerability

April 8th, 2016
ZDI-16-225 ZDI-CAN-3614

CVE ID

CVE-2016-1017

CVSS Score

6.8 AV:N/AC:M/Au:N/C:P/I:P/A:P

Affected Vendors

Adobe

Affected Products

Flash

Vulnerability Details


This vulnerability allows remote attackers to execute arbitrary code on vulnerable installations of Adobe Flash. User interaction is required to exploit this vulnerability in that the target must visit a malicious page or open a malicious file.

The specific flaw exists within the handling of LoadVars.decode. The issue lies in the failure to safely hold a reference to arguments during execution of the function. An attacker can leverage this vulnerability to execute arbitrary code under the context of the current process.

Additional Details

Adobe has issued an update to correct this vulnerability. More details can be found at:
https://helpx.adobe.com/security/products/flash-player/apsb16-10.html

Disclosure Timeline

  • 2016-03-16 - Vulnerability reported to vendor
  • 2016-04-08 - Coordinated public release of advisory

Credit

Yuki Chen of Qihoo 360 Vulcan Team

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