Advisory Details

May 4th, 2017

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

CVE ID	CVE-2017-2491
CVSS SCORE	6.8, AV:N/AC:M/Au:N/C:P/I:P/A:P
AFFECTED VENDORS	Apple
AFFECTED PRODUCTS	Safari
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 the String.replace method. The issue results from the lack of validating the existence of an object prior to performing operations on the object. 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/HT207617
DISCLOSURE TIMELINE	2017-03-17 - Vulnerability reported to vendor 2017-05-04 - Coordinated public release of advisory
CREDIT	Samuel Groß and Niklas Baumstark

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