US-CERT has posted a warning of an exploit affecting the use of the Bash shell.
See
https://www.us-cert.gov/ncas/current...-Vulnerability
See
http://www.smh.com.au/it-pro/securit...25-10ltx1.html
Linux, UNIX and Mac OS X users should upload fixes for their respective
operating systems.
At the time of posting, Apple have yet to make an announcement nor provide a fix.
Fixes are now available for all major Linux distributions.