Advisory Details

July 27th, 2011

Apple Safari Webkit SVG Marker Remote Code Execution Vulnerability

ZDI-11-240
ZDI-CAN-1021

CVE ID CVE-2011-1453
CVSS SCORE 7.5, (AV:N/AC:L/Au:N/C:P/I:P/A:P)
AFFECTED VENDORS Apple
AFFECTED PRODUCTS WebKit
TREND MICRO CUSTOMER PROTECTION Trend Micro TippingPoint IPS customers are protected against this vulnerability by Digital Vaccine protection filter ID 11273. 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's Webkit. 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 library's support of SVG markers. When updating a marker, the application will duplicate the reference of an object without updating it's reference count. When freeing this object, a use-after-free vulnerability can be made to occur. This can be leveraged by a remote attacker to execute code under the context of the user running the application.

ADDITIONAL DETAILS Apple has issued an update to correct this vulnerability. More details can be found at:
http://support.apple.com/kb/HT4808
DISCLOSURE TIMELINE
  • 2011-01-21 - Vulnerability reported to vendor
  • 2011-07-27 - Coordinated public release of advisory
CREDIT wushi of team509
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