Bash shell vulnerable – ShellShock

Bash shell vulnerable – ShellShock

Currently a new bug, named ShellShock, was announced as CVE-2014-6271 in the National Vulnerability Database. It might be even more dangerous than the SSL bug „Heartbleed“ that occured some month ago.
An overview, according to the web site:

GNU Bash through 4.3 processes trailing strings after function definitions in the values of environment variables, which allows remote attackers to execute arbitrary code via a crafted environment, as demonstrated by vectors involving the ForceCommand feature in OpenSSH sshd, the mod_cgi and mod_cgid modules in the Apache HTTP Server, scripts executed by unspecified DHCP clients, and other situations in which setting the environment occurs across a privilege boundary from Bash execution.

A simple test could give you an idea, if your system is vulnerable, or not:

If you see both „vulnerable“ and „testing…“ as a output on your bash shell, it is time for an upgrade. After the installation was successful, you should test another time. If everything went right, the output is as follows.

Leave A Comment