full-disclosure - ZDI-11-240: Apple Safari Webkit SVG Marker Remote Code Execution Vulnerability

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Message-ID: <AF6E290B52139041BD6CA591212E455B5766B941B1@GVW0442EXB.americas.hpqcorp.net>
Date: Wed, 27 Jul 2011 16:34:45 +0100
From: ZDI Disclosures <zdi-disclosures@...pingpoint.com>
To: "'full-disclosure@...ts.grok.org.uk'" <full-disclosure@...ts.grok.org.uk>, 
	"'bugtraq@...urityfocus.com'" <bugtraq@...urityfocus.com>
Subject: ZDI-11-240: Apple Safari Webkit SVG Marker Remote
 Code Execution Vulnerability

ZDI-11-240: Apple Safari Webkit SVG Marker Remote Code Execution Vulnerability

http://www.zerodayinitiative.com/advisories/ZDI-11-240

July 27, 2011

-- CVE ID:
CVE-2011-1453

-- CVSS:
7.5, (AV:N/AC:L/Au:N/C:P/I:P/A:P)

-- Affected Vendors:
Apple

-- Affected Products:
Apple WebKit

-- TippingPoint(TM) IPS Customer Protection:
TippingPoint IPS customers have been protected against this
vulnerability by Digital Vaccine protection filter ID 11273. 
For further product information on the TippingPoint IPS, visit:

    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 its 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.

-- Vendor Response:
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:
This vulnerability was discovered by:
    * wushi of team509

-- About the Zero Day Initiative (ZDI):
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a best-of-breed model for rewarding security researchers for responsibly
disclosing discovered vulnerabilities.

Researchers interested in getting paid for their security research
through the ZDI can find more information and sign-up at:

    http://www.zerodayinitiative.com

The ZDI is unique in how the acquired vulnerability information is
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TippingPoint provides its customers with zero day protection through
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