If you are running an older version of Java Update ASAP

Seven vulnerabilities have been reported in Sun Java JRE (Java Runtime
Environment), which potentially can be exploited by malicious people to
compromise a user's system.



The vulnerabilities are caused due to various unspecified errors in the
"reflection" APIs. This may be exploited by a malicious, untrusted
applet to read and write local files or execute local applications.



The following releases are affected by one or more of the seven vulnerabilities on Windows, Solaris, and Linux platforms:

* JDK and JRE 5.0 Update 5 and prior

* SDK and JRE 1.4.2_09 and prior

* SDK and JRE 1.3.1_16 and prior

Solution:
Update to the fixed versions.



JDK and JRE 5.0:

Update to JDK and JRE 5.0 Update 6 or later.

http://java.sun.com/j2se/1.5.0/download.jsp



SDK and JRE 1.4.x:

Update to SDK and JRE 1.4.2_10 or later.

http://java.sun.com/j2se/1.4.2/download.html



SDK and JRE 1.3.x:

Update to SDK and JRE 1.3.1_17 or later.

http://java.sun.com/j2se/1.3/download.html


Secunia - Advisories - Sun Java JRE "reflection" APIs Sandbox Security Bypass Vulnerabilities