(Pwn2Own) Apple Safari WebSQL Type Confusion Information Disclosure Vulnerability

May 18th, 2017
ZDI-17-360 ZDI-CAN-4593

CVE ID

CVE-2017-6991

CVSS Score

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

Affected Vendors

Apple

Affected Products

Safari

Vulnerability Details


This vulnerability allows remote attackers to disclose sensitive information 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 WebSQL. The issue results from the lack of proper validation of user-supplied data, which can result in a type confusion condition. An attacker can leverage this in conjunction with other vulnerabilities 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/HT207798

Disclosure Timeline

  • 2017-03-17 - Vulnerability reported to vendor
  • 2017-05-18 - Coordinated public release of advisory

Credit

Chaitin Security Research Lab

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