Bug Id
6594007

Product
Java 2 Platform, Standard Edition

Date of Workaround Release
03-OCT-2007

Date of Resolved Release
05-Sep-2008

Security Vulnerability in Java Runtime Environment With Applet Caching May Allow Network Access Restrictions to be Circumvented

1. Impact

A vulnerability in the Java Runtime Environment (JRE) with applet caching may allow an untrusted applet that is downloaded from a malicious website to make network connections to network services on machines other than the one that the applet was downloaded from. This may allow network resources (such as web pages) and vulnerabilities (that exist on these network services) which are not otherwise normally accessible to be accessed or exploited.

Sun acknowledges with thanks, Billy Rios for bringing this issue to our attention.

This issue has been reported at:

http://conference.hitb.org/hitbsecconf2007kl/?page_id=148

2. Contributing Factors

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

• JDK and JRE 6 Update 2 and earlier
• JDK and JRE 5.0 Update 12 and earlier
• SDK and JRE 1.4.2_15 and earlier
• SDK and JRE 1.3.1_20 and earlier

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

1. Click "Tools" in the Menu Bar at the top of the browser
2. Select "Sun Java Console"
3. The first two lines in the console displays the version of Java Plug-in and JRE that Internet Explorer uses

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:

Java(TM) Plug-in 1.5.0_11-b03

The above example indicates that the version of the JRE that the browser uses is 1.5.0_11.

3. Symptoms

There are no predictable symptoms that would indicate that the above issue is being exploited.

4. Workaround

To mitigate against DNS rebinding attacks, sites can remove internal IP addresses in DNS lookup results from external DNS servers. This can be done by either filtering such packets at the firewall or by modifying the DNS servers used by clients inside the firewall.

5. Resolution

Sun has included changes that perform additional hostname matching using DNS reverse mapping data to mitigate these issues in the following releases. (We are working with industry partners to more fully address these issues and will include additional improvements in later update releases.)

Mitigations are included in the following releases (for Windows, Solaris and Linux):

• JDK and JRE 6 Update 3 and later
• JDK and JRE 5.0 Update 13 and later
• SDK and JRE 1.4.2_16 and later

and is included in the following release (for Windows and Solaris 8):

• SDK and JRE 1.3.1_21 and later

JDK and JRE 6 Update 3 is available for download at:

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

http://java.com

JDK 6 Update 3 for Solaris is available in the following patches:

• Java SE 6: update 3 (as delivered in patch 125136-04 or later)
• Java SE 6: update 3 (as delivered in patch 125137-04 or later (64bit))
• Java SE 6_x86: update 3 (as delivered in patch 125138-04 or later)
• Java SE 6_x86: update 3 (as delivered in patch 125139-04 or later (64bit))

JDK and JRE 5.0 Update 13 is available for download at:

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

JDK 5.0 Update 13 for Solaris is available in the following patches:

• J2SE 5.0: update 13 (as delivered in patch 118666-14 or later)
• J2SE 5.0: update 13 (as delivered in patch 118667-14 or later (64bit))
• J2SE 5.0_x86: update 13 (as delivered in patch 118668-14 or later)
• J2SE 5.0_x86: update 13 (as delivered in patch 118669-14 or later (64bit))

SDK and JRE 1.4.2_16 is available for download at:

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

SDK and JRE 1.3.1 for Solaris 8 is available for download at:

http://java.sun.com/j2se/1.3/download.html

SDK and JRE 1.3.1 has completed the Sun End of Life (EOL) process and is only supported for customers with Solaris 8 and Vintage Support Offering support contracts (see http://java.sun.com/j2se/1.3/download.html). Sun strongly recommends that users upgrade to the latest releases.

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

For more information on Security Sun Alerts, see 1009886.1.

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 2000-2008 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, CA 95054 U.S.A. All rights reserved.
Modification History
09-Oct-2007: Updated Resolution Section
22-Oct-2007: Updated Resolution Section
05-Sep-2008: No further updates, republish as Resolved

References

125136-04
125137-04
125138-04
125139-04
118666-14
118667-14
118668-14
118669-14





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