Public Vulnerability Reports

Multiple Vendor WebKit CoreIPC::ArgumentEncoder Memory Corruption Vulnerability

03.14.13

BACKGROUND

WebKit is an open-source Web browser engine. Currently, Apple Inc.'s Safari browser and Google Inc.'s Chrome browser use it. For more information, see the vendor's site at the following link:

http://webkit.org/

DESCRIPTION

Remote exploitation of a memory corruption vulnerability in WebKit, as included with multiple vendors' browsers, could allow an attacker to execute arbitrary code with the privileges of the current user.

This vulnerability occurs when an out-of-memory condition is reached in a specific function. By consuming a large amount of memory, it is possible to force the malloc()/realloc() functions to fail and return a NULL pointer. This leads to memory corruption.

ANALYSIS

Exploitation of this vulnerability results in the execution of arbitrary code with the privileges of the user viewing the Web page. To exploit this vulnerability, a targeted user must load a malicious Web page created by an attacker. An attacker typically accomplishes this via social engineering or injecting content into compromised, trusted sites. After the user visits the malicious Web page, no further user interaction is needed.

DETECTION

Safari versions prior to 6.0.3; iTunes versions prior to 11.0.3 are vulnerable.

WORKAROUND

Disabling JavaScript is an effective workaround for this vulnerability; however, disabling scripting can severely impact the usability of the browser.

VENDOR RESPONSE

Apple has released a fix which addresses this issue. For more information, consult their advisory at the following URL:

http://lists.apple.com/archives/security-announce/2013/Mar/msg00003.html

CVE INFORMATION

The Common Vulnerabilities and Exposures (CVE) project has assigned the name CVE-2013-0961 to this issue. This is a candidate for inclusion in the CVE list (http://cve.mitre.org/), which standardizes names for security problems.

DISCLOSURE TIMELINE

05/16/2012 Initial Vendor Notification
05/17/2012 Initial Vendor Reply
03/14/2013 Coordinated Public Disclosure

CREDIT

This vulnerability was reported to iDefense by wushi of team509.

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LEGAL NOTICES

Copyright © 2013 Verisign, Inc.

Permission is granted for the redistribution of this alert electronically. It may not be edited in any way without the express written consent of iDefense Verisign. If you wish to reprint the whole or any part of this alert in any other medium other than electronically, please e-mail customer service for permission.

Disclaimer: The information in the advisory is believed to be accurate at the time of publishing based on currently available information. Use of the information constitutes acceptance for use in an AS IS condition. There are no warranties with regard to this information. Neither the author nor the publisher accepts any liability for any direct, indirect, or consequential loss or damage arising from use of, or reliance on, this information.