USN-1804-1 fixed vulnerabilities in IcedTea-Web. This update introduced a regression with the Java Network Launching Protocol (JNLP) when fetching content over SSL under certain configurations, such as when using the community-supported IcedTead 7 browser plugin. This update fixes the problem.
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Original advisory details:
Jiri Vanek discovered that IcedTea-Web would use the same classloader for applets from different domains. A remote attacker could exploit this to expose sensitive information or potentially manipulate applets from other domains. (CVE-2013-1926)
It was discovered that IcedTea-Web did not properly verify JAR files and was susceptible to the GIFAR attack. If a user were tricked into opening a malicious website, a remote attacker could potentially exploit this to execute code under certain circumstances. (CVE-2013-1927)