14 DAY TRIAL // Canonical published details about the OpenJDK 7 vulnerabilities in its Ubuntu 13.10, Ubuntu 13.04, and Ubuntu 12.10 operating systems.
According to the company, several security issues have been fixed in OpenJDK 7.
Several vulnerabilities have been discovered in the OpenJDK JRE related to information disclosure, data integrity and availability. An attacker could exploit these to cause a denial of service or expose sensitive data over the network.
For a more detailed description of the problems, you can see Canonical's security notification.
The security flaws can be fixed if you upgrade your system(s) to the latest openjdk-7-jre-lib, openjdk-7-jre-zero, icedtea-7-jre-jamvm, openjdk-7-jre-headless, and openjdk-7-jre packages, specific to each distribution. To apply the patch, run the Update Manager application.
In general, a standard system update will make all the necessary changes and you will have to restart the system.