(Mobile Pwn2Own) Apple Safari shiftCount/splice Remote Code Execution Vulnerability

February 1st, 2013
ZDI-13-009 ZDI-CAN-1657

CVE ID

CVE-2012-3748

CVSS Score

7.5 AV:N/AC:L/Au:N/C:P/I:P/A:P

Affected Vendors

Apple

Affected Products

iPhone
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 Array objects. When splicing a sparse array, the size of a sparse array is not properly validated. In addition, parameters checked at the beginning of a function are never again validated despite being modified later on. By abusing this behavior an attacker can ensure this memory is under control and leverage the situation to achieve remote code execution.

Additional Details

Apple has issued an update to correct this vulnerability. More details can be found at:
http://support.apple.com/kb/HT5567

Apple has issued an update to correct this vulnerability. More details can be found at:
http://support.apple.com/kb/HT5567

Disclosure Timeline

  • 2012-09-02 - Vulnerability reported to vendor
  • 2013-02-01 - Coordinated public release of advisory

Credit

Joost Pol and Daan Keuper of Certified Secure

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