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When is it suitable to remove Java updates?

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It has been acknowledged by Sun Microsystems Inc. that malicious websites could possibly invoke these outdated versions of the software still present on a user's machine, even if the latest, patched version has been installed and set as the authoritative version to be used by both the user's default Web browser and the operating system.

Sun did try to prevent sites from invoking these older, insecure versions of Java, but in July of last year, security researcher John Heasman of Next Generation Security Software Ltd. outlined a method by which attackers could bypass that protection. Sun has since released JRE6 Update 10, which includes "patch in place" capability, meaning future updates will remove older versions upon installation. Having just updated my own PC to Version 6 Update 12, I can confirm this feature works. However, it doesn't remove any pre-Update 10 versions you may have on your machine.

Unless you are running older Java applications that were version-specific, you should uninstall all older versions of Java from your system. You can safely remove older Java updates manually from your PC by following the instructions on the Windows Java instructions page. If you do have any version-specific Java applications, contact the provider or developer as it is their responsibility to rectify their applet code in order to ensure compatibility with all Java versions.

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This was first published in July 2009

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