Sun
Java Runtime Environment, which could be exploited by attackers to
bypass security restrictions and take complete control of an affected
system. These issues are due to errors related to serialization, which
could be exploited by attackers to read, write, or execute arbitrary
files by tricking a user into visiting a specially crafted web page
containing a malicious applet.
Affected Products
Sun Java JDK 1.5.x (for Windows, Solaris, and Linux)
Sun Java JRE 1.4.x (for Windows, Solaris, and Linux)
Sun Java JRE 1.5.x / 5.x (for Windows, Solaris, and Linux)
Sun Java SDK 1.4.x (for Windows, Solaris, and Linux)
Solution
Upgrade to JDK/JRE 5.0 Upgrade 8 or SDK/JRE 1.4.2_13 :
http://www.java.com