Advisory Details

May 20th, 2016

(Pwn2Own) Apple Safari GraphicsContext Use-After-Free Remote Code Execution Vulnerability

ZDI-16-352
ZDI-CAN-3610

CVE ID CVE-2016-1859
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 ['24026']. 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 GraphicsContext objects. By manipulating a document's elements an attacker can force this object 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
  • 2016-05-20 - Coordinated public release of advisory
CREDIT Liang Chen and wushi of KeenLab Tencent
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