Note: This is an archival copy of Security Sun Alert 245246 as previously published on http://sunsolve.sun.com.|
Latest version of this security advisory is available from http://support.oracle.com as Sun Alert 1019759.1.
Date of Resolved Release
The Java Runtime Environment UTF-8 decoder may allow multiple representations of UTF-8 input:
The UTF-8 (Unicode Transformation Format-8) decoder in the Java Runtime Environment (JRE) accepts encodings that are longer than the "shortest" form. This behavior is not a vulnerability in Java SE. However, it may be leveraged to exploit systems running software that relies on the JRE UTF-8 decoder to reject non-shortest form sequences. For example, non-shortest form sequences may be decoded into illegal URIs, which may then allow files that are not otherwise accessible to be read, if the URIs are not checked following UTF-8 decoding.
2. Contributing Factors
This issue can occur in the following Java SE and Java SE for Business releases for Solaris, Windows and Linux:
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, as shown in the following example:
Java(TM) Plug-in 1.5.0_11-b03(Indicating that the JRE version the browser uses is 1.5.0_11)
There are no reliable symptoms that would indicate the described issue has been exploited.
There is no workaround for this issue. Please see the Resolution section below.
This issue is addressed in the following Java SE and Java SE for Business releases for Solaris, Windows and Linux:
JDK 6 Update 11:
Java Update tool for Microsoft Windows users.
JDK 6 Update 11 is also available for Solaris in the following patches:
is also available for Solaris in the following patches:
Java SE for Business Releases:
Note 1: Java SE releases SDK and JRE 1.4.2 have completed the Sun End of Service Life (EOSL) process. Sun recommends that users upgrade to the latest Java SE release. Customers interested in continuing to receive critical fixes on SDK and JRE 1.4.2 are encouraged to migrate to Java SE for Business.
Note 2: SDK and JRE 1.3.1 have completed the Sun End of Service Life (EOSL) 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 Java SE release.
Note 3: 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 1009886.1.
Copyright 2000-2008 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, CA 95054 U.S.A. All rights reserved.
Java Platform, Standard Edition 6 (Java SE 6)
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