IcedTea6 before 1.7.4 allow unsigned apps to read and write arbitrary files, related to Extended JNLP Services.
https://security-tracker.debian.org/tracker/CVE-2010-2783
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2010-2783
http://security.gentoo.org/glsa/glsa-201406-32.xml
http://blog.fuseyism.com/index.php/2010/07/28/icedtea6-174-released/