Note: This is an archival copy of Security Sun Alert 238905 as previously published on http://sunsolve.sun.com.|
Latest version of this security advisory is available from http://support.oracle.com as Sun Alert 1019367.1.
6557220, 6703909, 6704077, 6704074
Date of Resolved Release
Multiple Security Vulnerabilities in Java Web Start may allow Privileges to be Elevated
CR 6557220: Buffer overflow vulnerabilities in Java Web Start may allow an untrusted Java Web Start application to elevate its privileges. For example, an untrusted Java Web Start application may grant itself permissions to read and write local files or execute local applications that are accessible to the user running the untrusted application.
CR 6703909: A vulnerability in Java Web Start may allow an untrusted Java Web Start application downloaded from a website to create arbitrary files with the permissions of the user running the untrusted Java Web Start application.
CR 6704077: A vulnerability in Java Web Start may allow an untrusted Java Web Start application downloaded from a website to create or delete arbitrary files with the permissions of the user running the untrusted Java Web Start application.
CR 6704074: A vulnerability in Java Web Start may allow an untrusted Java Web Start application to determine the location of the Java Web Start cache.
Sun acknowledges with thanks, the following:
Buffer overflow vulnerabilities:
John Heasman of NGSSoftware
An anonymous researcher working with Zero Day Initiative (http://www.zerodayinitiative.com/) and TippingPoint (http://www.tippingpoint.com)
File creation, deletion, and cache disclosure vulnerabilities:
Peter Csepely working with Zero Day Initiative (http://www.zerodayinitiative.com/) and TippingPoint (http://www.tippingpoint.com).
2. Contributing Factors
The first issue (CR 6557220) can occur in Java Web Start in the following releases for Windows, Solaris, and Linux:
The browser will display a page called "Installed plug-ins" which lists the version of the Java Plug-in, as in the following example:
Java(TM) Plug-in 1.5.0_11-b03
The above example indicates the version of the JRE that the browser uses is 1.5.0_11.
There are no predictable symptoms that would indicate the described issues have been exploited.
To reduce the likelihood of executing untrusted applications which may allow these issues to be exploited, Java Web Start applications may be disabled temporarily (until the updates or patches have been installed) as follows:
For Internet Explorer (Windows):
Note 1: On Microsoft Windows, applications may also be launched from the desktop icon or Start Menu if a shortcut was previously created for an application. Unknown applications should not be launched through the desktop icon or the Start Menu. Shortcuts can be removed by using the Java Web Start Application Manager through the "Application/Remove Shortcut" menu item. For more information, see:
Note 2: It is also possible to launch applications through the command line in Windows, Solaris, and Linux. Unknown applications should not be launched through the command line. Sites may consider renaming the Java Web Start launcher ("javaws.exe" for Windows and "javaws" for Solaris and Linux) to prevent Java Web Start from launching.
The launcher can be found at:
JRE 6: C:\Program Files\Java\jre1.6.0_03\bin\javaws.exe
JRE 5.0: C:\Program Files\Java\jre1.5.0_13\bin\javaws.exe
JRE 1.4.2: C:\Program Files\Java\j2re1.4.2_16\javaws\javaws.exe
Solaris (if installed using pkg):
Linux (if installed using rpm):
JRE 6: /usr/java/jre1.6.0/bin/javaws
JRE 5.0: /usr/java/jre1.5.0/bin/javaws
JRE 1.4.2: /usr/java/j2re1.4.2/bin/javaws
The first issue (CR 6557220) is addressed in the following releases for Windows, Solaris, and Linux:
JDK and JRE 6 Update 7 is available for download at the following links:
JRE 6 Updates are available through the Java Update tool for Microsoft Windows users.
JDK 6 Update 7 for Solaris is available in the following patches:
JDK 5.0 Update 16 for Solaris will be available in the following patches:
J2SE 5.0 Update 16 (as delivered in patch 118666-17)
J2SE 5.0 Update 16 (as delivered in patch 118667-17 (64bit))
J2SE 5.0_x86 Update 16 (as delivered in patch 118668-17)
J2SE 5.0_x86 Update 16 (as delivered in patch 118669-17 (64bit))
SDK and JRE 1.4.2 is available for download 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 1009886.1.
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