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Oracle Java Runtime Environment FileDialog.show() Heap Buffer Oveflow Vulnerability

08.06.11

BACKGROUND

Java Runtime Environment (JRE) is a platform that supports the execution of programs that are developed using the Java programming language. It is available for multiple platforms, including Windows, Linux and MacOS. The JRE platform also supports Java Applets which can be loaded from Web pages. For more information, visit the link shown below.

http://www.java.com/en/about/

DESCRIPTION

Remote exploitation of a heap-based buffer overflow vulnerability in Oracle Corp.'s Java could allow an attacker to execute arbitrary code with the privileges of the current user.

The vulnerability occurs when the JRE handles the API function FileDialog.show(), which is used to prompt the user with a File selection dialog. It is possible to populate the file name variable in the dialog box, which is later used in a string copy operation. The length of this string is unchecked and is copied into a heap buffer using a certain function, which can lead to a heap-based buffer overflow.

ANALYSIS

Exploitation of this vulnerability results in the execution of arbitrary code with the privileges of the current user. To exploit this vulnerability, a user must load a Web page containing a specially crafted Java applet. An attacker typically accomplishes this via social engineering or injecting content into compromised, trusted sites. Typical social engineering attacks will pass URLs as part of instant messages or electronic mail.

DETECTION

Java SE is vulnerable. JDK and JRE 6 Update 25 and earlier, JDK 5.0 Update 29 and earlier and SDK 1.4.2_31 and earlier are vulnerable.

WORKAROUND

It is possible to disable the Java plug-in in Internet Explorer, Firefox, Safari, Opera and Google Chrome.

VENDOR RESPONSE

Oracle Corp. has released a patch which addresses this issue. For more information, consult their advisory at the following URL.

http://www.oracle.com/technetwork/topics/security/javacpujune2011-3133 39.html

CVE INFORMATION

The Common Vulnerabilities and Exposures (CVE) project has assigned the name CVE-2011-0815 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

12/29/2010 Initial Vendor Notification
12/29/2010 Initial Vendor Reply
06/08/2011 Coordinated Public Disclosure

CREDIT

The discoverer of this vulnerability wishes to remain anonymous.

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LEGAL NOTICES

Copyright © 2011 Verisign, Inc.

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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.