icedtea-web: multiple issues

• CVE-2015-5234 (unexpected permanent authorization of unsigned applets)

It was discovered that IcedTea-Web did not properly sanitize applet URLs
when storing applet trust settings. A malicious web page could use this
flaw to inject trust-settings configuration, and cause applets to be
executed without user approval.

• CVE-2015-5235 (applet origin spoofing)

It was discovered that IcedTea-Web did not properly determine an
applet’s origin when asking the user if the applet should be run. A
malicious page could use this flaw to cause IcedTea-Web to execute the
applet without user approval, or confuse the user into approving applet
execution based on an incorrectly indicated applet origin.