what you don't know can hurt you

Zero Day Initiative Advisory 12-147

Zero Day Initiative Advisory 12-147
Posted Aug 23, 2012
Authored by Tipping Point | Site zerodayinitiative.com

Zero Day Initiative Advisory 12-147 - This vulnerability allows remote attackers to execute arbitrary code on vulnerable installations of the WebKit library. 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 when the library attempts to replace a particular element due to an HTML5 ContentEditable command. Due to the library not accommodating for DOM mutation events that can be made to occur, an aggressor can modify the tree out from underneath the library, leading to a type change. This can be used to trigger a use-after-free condition at which point can lead to code execution under the context of the application.

tags | advisory, remote, arbitrary, code execution
advisories | CVE-2011-3897
MD5 | e38999c3623f3b65674bd469619a569c

Zero Day Initiative Advisory 12-147

Change Mirror Download
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ZDI-12-147 : WebKit ContentEditable swapInNode Use-After-Free Remote Code
Execution Vulnerability
http://www.zerodayinitiative.com/advisories/ZDI-12-147
August 22, 2012

- -- CVE ID:
CVE-2011-3897

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

- -- Affected Vendors:
WebKit.Org

- -- Affected Products:
WebKit.Org WebKit

- -- TippingPoint(TM) IPS Customer Protection:
TippingPoint IPS customers have been protected against this
vulnerability by Digital Vaccine protection filter ID 12492.
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 the WebKit library. 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 when the library attempts to replace a particular
element due to an HTML5 ContentEditable command. Due to the library not
accommodating for DOM mutation events that can be made to occur, an
aggressor can modify the tree out from underneath the library, leading to a
type change. This can be used to trigger a use-after-free condition at
which point can lead to code execution under the context of the
application.

- -- Vendor Response:
WebKit.Org has issued an update to correct this vulnerability. More details
can be found at:
https://bugs.webkit.org/show_bug.cgi?id=71145

- -- Disclosure Timeline:
2011-10-28 - Vulnerability reported to vendor
2012-08-22 - Coordinated public release of advisory

- -- Credit:
This vulnerability was discovered by:
* pa_kt / twitter.com/pa_kt

- -- 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/

Follow the ZDI on Twitter:

http://twitter.com/thezdi

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