Integer Overflow Vulnerability in the Java Runtime Environment (JRE) "Unpack200" JAR Unpacking Utility May Lead to Escalation of Privileges

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Integer Overflow Vulnerability in the Java Runtime Environment (JRE) "Unpack200" JAR Unpacking Utility May Lead to Escalation of Privileges

1. Impact

An integer overflow vulnerability in the Java Runtime Environment with unpacking applets and Java Web Start applications using the unpack200 JAR unpacking utility may allow an untrusted applet or application to escalate privileges. For example, an untrusted applet may grant itself permissions to read and write local files or execute local applications that are accessible to the user running the untrusted applet.

Sun acknowledges with thanks:


for bringing this issue to our attention.

This issue is referenced in the following document:


2. Contributing Factors

This issue can occur in the following Java SE and Java SE for Business releases for Windows, Solaris, and Linux:

• JDK and JRE 6 Update 14 and earlier
• JDK and JRE 5.0 Update 19 and earlier

Note: SDK and JRE 1.4.2 and 1.3.1 are not affected.

To determine the default version of the JRE that Internet Explorer uses, visit the URL:


To determine the default version of the JRE that Mozilla or Firefox browsers use, visit the URL "about:plugins".

The browser will display a page called "Installed plug-ins" which lists the version of the Java Plug-in such as the following:


The above indicates that the version of JRE the browser uses is version 6 Update 13.

3. Symptoms

There are no predictable symptoms that would indicate the described issue has been exploited.

4. Workaround

There is no workaround for this issue. Please see the Resolution section below.

5. Resolution

This issue is addressed in the following Java SE and Java SE for Business releases for Windows, Solaris, and Linux:

• JDK and JRE 6 Update 15 or later
• JDK and JRE 5.0 Update 20 or later

Java SE releases are available at:

JDK and JRE 6 Update 15:


JRE 6 Update 15:


through the Java Update tool for Microsoft Windows users.

JDK 6 Update 15 for Solaris is available in the following patches:

• Java SE 6 Update 15 (as delivered in patch 125136-16)
• Java SE 6 Update 15 (as delivered in patch 125137-16 (64bit))
• Java SE 6_x86 Update 15 (as delivered in patch 125138-16)
• Java SE 6_x86 Update 15 (as delivered in patch 125139-16 (64bit))

JDK and JRE 5.0 Update 20:


JDK 5.0 Update 20 for Solaris is available in the following patches:

• J2SE 5.0 Update 20 (as delivered in patch 118666-21)
• J2SE 5.0 Update 20 (as delivered in patch 118667-21 (64bit))
• J2SE 5.0_x86 Update 20 (as delivered in patch 118668-21)
• J2SE 5.0_x86 Update 20 (as delivered in patch 118669-21 (64bit))

Java SE for Business releases are available at:


Note: When installing a new version of the product from a source other than a Solaris patch, it is recommended that the old affected versions be removed from your system. To remove old affected versions on the Windows platform, please see:


For more information on Security Sun Alerts, see Technical Instruction ID 213557.

This Sun Alert notification is being provided to you on an "AS IS" basis. This Sun Alert notification may contain information provided by third parties. The issues described in this Sun Alert notification may or may not impact your system(s). Sun makes no representations, warranties, or guarantees as to the information contained herein. ANY AND ALL WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT, ARE HEREBY DISCLAIMED. BY ACCESSING THIS DOCUMENT YOU ACKNOWLEDGE THAT SUN SHALL IN NO EVENT BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, PUNITIVE, OR CONSEQUENTIAL DAMAGES THAT ARISE OUT OF YOUR USE OR FAILURE TO USE THE INFORMATION CONTAINED HEREIN. This Sun Alert notification contains Sun proprietary and confidential information. It is being provided to you pursuant to the provisions of your agreement to purchase services from Sun, or, if you do not have such an agreement, the Sun.com Terms of Use. This Sun Alert notification may only be used for the purposes contemplated by these agreements.

Copyright 2000-2009 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, CA 95054 U.S.A. All rights reserved.


Modification History

10-Aug-2009: Update Impact section for CVE reference

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