Bash Vulnerablilty RHEL 5.3 bash-3.2-24.el5

We have one machine running Red Hat Enterprise Linux Server release 5.3 (Tikanga).
The current version on bash is:
[root@lcp102 ~]# rpm -q bash
bash-3.2-24.el5

I tried to update bash and got the following:
[root@lcp102 ~]# yum update bash
Loaded plugins: rhnplugin
Setting up Update Process
No Packages marked for Update

Should this "yum update bash" work on our 5.3 Red Hat? It worked on 5.8, 5.9, and 6.5.

I am a dba (not an sa) for small company, so help would be appreciated.

Thanks,
Steve