(Pwn2Own) Apple OS X WindowServer Use-After-Free Privilege Escalation Vulnerability
Vulnerability Details
This vulnerability allows local attackers to execute arbitrary code on vulnerable installations of Apple OS X. 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 CFData objects within the WindowServer process. An attacker can cause a CFData object in memory to be reused after it has been freed. An attacker can leverage this vulnerability to execute arbitrary code under the context of the WindowServer.
Additional Details
Apple has issued an update to correct this vulnerability. More details can be found at:
https://support.apple.com/en-us/HT206567
Disclosure Timeline
- 2016-03-16 - Vulnerability reported to vendor
- 2016-05-26 - Coordinated public release of advisory
Credit
Liang Chen
Yubin Fu
Marco Grassi of KeenLab
Tencent
