Still unresolved Shellshock major vulnerability affecting Bash on Linux, Unix and MAC OS X
Less than two days after it was detected a vulnerability (CVE-2014-6271) that affects the Bash shell on Linux, Unix and Mac OS X, a patch was released that solves this issue only partially, which forced to report a new vulnerability (CVE-2014-7169) still pending. This issue has quickly gained a simple name by which it will be remembered for a long time: Shellshock or Shell Shock.
The bug was detected by Stephane Chazelas, a Unix and Linux system administrator from Akamai when he found out that Bash erroneously interpreted as a command wich only was data within a variable when entering a specially crafted string in the command line. As a result, everything coming after that string was executed as a command or function by Bash. This allows any attacker to execute commands on your server arbitrarily. It’s true that this can not be done as root, but there are many harmful actions that can be done without root privileges.