A security vulnerability in the Java Runtime Environment Applet Class Loader may allow an untrusted applet that is loaded from a remote system to circumvent network access restrictions and establish socket connections to certain services running on the local host, as if it were loaded from the system that the applet is running on. This may allow the untrusted remote applet the ability to exploit any security vulnerabilities existing in the services it has connected to.

Sun acknowledges with thanks, John Heasman of NGSSoftware, for bringing this issue to our attention.

This issue can occur in the following releases (for Windows, Solaris, and Linux):

• JDK and JRE 6 Update 1 and earlier
• JDK and JRE 5.0 Update 11 and earlier
• SDK and JRE 1.4.2_14 and earlier

To determine the default version of the JRE on a system for Solaris and Linux, the following command can be run:

    % java -version

Note: The above command only determines the default version. Other versions may also be installed on the system.

To determine the default version of the JRE on a system for Windows:

1. Click "Start"
2. Select "Run"
3. Type "cmd" (starts a command-line)
4. At the prompt, type "java -version"

Note: The above command only determines the default version. Other versions may also be installed on the system.

There are no reliable symptoms that would indicate the described issue has been exploited to elevate privileges.

There is no workaround. Please see the "Resolution" section below.

This issue is addressed in the following releases (for Windows, Solaris, and Linux):

• JDK and JRE 6 Update 2 or later
• JDK and JRE 5.0 Update 12 or later
• SDK and JRE 1.4.2_15 or later

Java SE 6 Update 2 is available for download at:

• http://java.sun.com/javase/downloads/index.jsp
• http://java.com

Java SE 6 Update 2 for Solaris is available in the following patches:

• Java SE 6: update 2 (as delivered in patch 125136-02 or later)
• Java SE 6: update 2 (as delivered in patch 125137-02 or later (64bit))
• Java SE 6_x86: update 2 (as delivered in patch 125138-02 or later)
• Java SE 6_x86: update 2 (as delivered in patch 125139-02 or later (64bit))

Java SE 5.0 Update 12 is available for download at:

• http://java.sun.com/javase/downloads/index_jdk5.jsp

Java SE 5.0 Update 12 for Solaris is available in the following patches:

• Java SE 5.0: update 12 (as delivered in patch 118666-12 or later)
• Java SE 5.0: update 12 (as delivered in patch 118667-12 or later (64bit))
• Java SE 5.0_x86: update 12 (as delivered in patch 118668-12 or later)
• Java SE 5.0_x86: update 12 (as delivered in patch 118669-12 or later (64bit))

SDK and JRE 1.4.2_15 is available for download at:

http://java.sun.com/j2se/1.4.2/download.html

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:

• http://java.com/en/download/help/uninstall_java.xml

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