The flaws affect systems running on Windows, Solaris and Linux that are using certain versions of Sun's Java Development Kit 1.5, Software Development Kit (SDK) 1.3 and 1.4, and JRE 1.3, 1.4, 1.5 and 5.0, or earlier, according to an advisory issued by Secunia, which rated the flaws as "highly critical."
Sun's JRE software, especially version 1.4, is found on a number of computers and allows users to run Java applications, which operate in a "sandbox"--a separate area cordoned off from the rest of the user's system.
These latest flaws are found in one of the JRE's application programming interfaces, or API, which communicate between the sandbox and the rest of the system. The flaws could be exploited by attackers to gain remote access to a user's Java applications, allowing them to read and write files or execute code.
"An applet may grant itself permissions to read and write local files or execute local applications that are accessible to the user running the untrusted applet," according to Sun's advisory.
Sun's security patch is its latest involving JRE. Last November, Sun, of which three also dealt with the API.