The "Java Update" feature for Java Runtime Environment (JRE) for Sun JDK and JRE 6 Update 10 and earlier; JDK and JRE 5.0 Update 16 and earlier; and SDK and JRE 1.4.2_18 and earlier does not verify the signature of the JRE that is downloaded, which allows remote attackers to execute arbitrary code via DNS man-in-the-middle attacks.
http://secunia.com/advisories/37386
http://security.gentoo.org/glsa/glsa-200911-02.xml
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A5664
http://sunsolve.sun.com/search/document.do?assetkey=1-26-244989-1
http://www.securitytracker.com/id?1021315