full-disclosure - ZDI-10-257: Apple Webkit WholeText Integer Overflow Remote Code Execution Vulnerability

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Message-ID: <EE499D69B3D0714590B6FE9762B0461104BF3275C7@emb01.unity.local>
Date: Tue, 23 Nov 2010 10:43:50 -0600
From: ZDI Disclosures <zdi-disclosures@...pingpoint.com>
To: "'Full Disclosure (full-disclosure@...ts.grok.org.uk)'"
	<full-disclosure@...ts.grok.org.uk>,
	"'Bugtraq (bugtraq@...urityfocus.com)'" <bugtraq@...urityfocus.com>
Subject: ZDI-10-257: Apple Webkit WholeText Integer
 Overflow Remote Code Execution Vulnerability

ZDI-10-257: Apple Webkit WholeText Integer Overflow Remote Code Execution Vulnerability

http://www.zerodayinitiative.com/advisories/ZDI-10-257

November 23, 2010

-- CVE ID:
CVE-2010-3812

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

-- Affected Vendors:
Apple

-- Affected Products:
Apple WebKit

-- Vulnerability Details:
This vulnerability allows remote attackers to execute arbitrary code on
vulnerable installations of Apple 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 wholeText method of the Text
element. When calculating the total size of all the text containing it,
the application will wrap a 32-bit integer. The application will use
this in an allocation and then later use a different value for
populating the buffer. This can lead to code execution under the context
of the application.

-- Vendor Response:
Apple states:
iOS 4.2: http://support.apple.com/kb/HT4456

-- Disclosure Timeline:
2010-08-12 - Vulnerability reported to vendor
2010-11-23 - Coordinated public release of advisory

-- Credit:
This vulnerability was discovered by:
    * J23 (http://twitter.com/HansJ23)

-- About the Zero Day Initiative (ZDI):
Established by TippingPoint, The Zero Day Initiative (ZDI) represents
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
used. TippingPoint does not re-sell the vulnerability details or any
exploit code. Instead, upon notifying the affected product vendor,
TippingPoint provides its customers with zero day protection through
its intrusion prevention technology. Explicit details regarding the
specifics of the vulnerability are not exposed to any parties until
an official vendor patch is publicly available. Furthermore, with the
altruistic aim of helping to secure a broader user base, TippingPoint
provides this vulnerability information confidentially to security
vendors (including competitors) who have a vulnerability protection or
mitigation product.

Our vulnerability disclosure policy is available online at:

    http://www.zerodayinitiative.com/advisories/disclosure_policy/

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