Advisory Details

May 19th, 2016

(Pwn2Own) Apple Safari ArrayStorage DFG Optimization Use-After-Free Remote Code Execution Vulnerability

ZDI-16-343
ZDI-CAN-3619

CVE ID CVE-2016-1857
CVSS SCORE 6.8, AV:N/AC:M/Au:N/C:P/I:P/A:P
AFFECTED VENDORS Apple
AFFECTED PRODUCTS Safari
TREND MICRO CUSTOMER PROTECTION Trend Micro TippingPoint IPS customers are protected against this vulnerability by Digital Vaccine protection filter ID ['24032']. For further product information on the TippingPoint IPS: http://www.tippingpoint.com
VULNERABILITY DETAILS


This vulnerability allows remote attackers to execute arbitrary code on vulnerable installations of Apple Safari. 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 ArrayBuffer objects. By triggering certain JavaScript optimizations, an attacker can force an ArrayBuffer in memory to be reused after it has been freed. An attacker can leverage this vulnerability to execute code under the context of the current process.
ADDITIONAL DETAILS Apple has issued an update to correct this vulnerability. More details can be found at:
https://support.apple.com/en-us/HT206568
DISCLOSURE TIMELINE
  • 2016-03-16 - Vulnerability reported to vendor
  • 2016-05-19 - Coordinated public release of advisory
CREDIT Liang Chen of KeenLab Tencent
Zhen Feng of KeenLab Tencent
wushi of KeenLab Tencent
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