http://sunsolve.sun.com/search/document.do?assetkey=1-26-101748-1
“A vulnerability in Java Web Start may allow an untrusted application to elevate its privileges. For example an application may grant itself permissions to read and write local files or execute local applications that are accessible to the user running the Java Web Start application.”
Ooops. 
“Note: Java Web Start in J2SE releases prior to 5.0 for Windows, Solaris and Linux, and Java Web Start 1.0.1_02 and earlier are not affected by this issue.”
Either way… here you go:
http://java.sun.com/j2se/1.5.0/download.jsp
