Excellent article on Shellshock, ramifications and mitigation.

http://www.troyhunt.com/2014/09/everything-you-need-to-know-about.html

Thanks for the post Tom - indeed an excellent discussion of the situation. Linux sysadmins and dealers supporting Linux should definitely take a serious look at this. And if you can't find the time to do that, at the very least update bash, i.e.

# yum update bash