Another article on the bash exploit in today's Sydney Morning Herald :-
http://www.smh.com.au/it-pro/securit...29-10nerp.html
The link Andrew provided contains a test (see snippet below) :-
https://isc.sans.edu/forums/diary/Up...llshock+/18707
Code:
The US-CERT's advisory includes a simple command line script that bash
users can run to test for the vulnerability. To check your system
from a command line, type or cut and paste this text:
env x='() { :;}; echo vulnerable' bash -c "echo this is a test"
If the system is vulnerable, the output will be:
vulnerable
this is a test
An unaffected (or patched) system will output:
bash: warning: x: ignoring function definition attempt
bash: error importing function definition for `x'
this is a test