TippingPoint Zero Day Initiative

Apple Webkit ContentEditable moveParagraphs Uninitialized Element Remote Code Execution Vulnerability

ZDI-10-097: June 8th, 2010


CVSS Score

Affected Vendors

Affected Products

TippingPoint™ IPS Customer Protection

TippingPoint IPS customers are protected against this vulnerability by Digital Vaccine protection filter ID 9850. For further product information on the TippingPoint IPS:

Vulnerability Details

This vulnerability allows remote attackers to execute arbitrary code on vulnerable installations of Apple's Webkit. User interaction is required in that a user must be coerced into visiting a malicious website.

The specific flaw exists within the way Webkit inserts an element into an editable container. Immediately before the actual insertion the library will manipulate the contents of the field in order to insert the new node. Upon traversal of the tree by the library, the application will attempt to access an uninitialized element that was created prior to the insertion. Successful exploitation can lead to code execution under the context of the application.

Vendor Response

Apple has issued an update to correct this vulnerability. More details can be found at:

Disclosure Timeline

    2010-02-18 - Vulnerability reported to vendor
    2010-06-08 - Coordinated public release of advisory


This vulnerability was discovered by:
    wushi of team509