[URGENT] ShellShock BASH Vulnerability

[USHost247]

On Thursday, September 25th, news broke everywhere of a major new bug called “Shellshock” found in a command-line system known as Bash, which runs on the Linux operating system, relied on by most websites. The vulnerability is so severe that the US government's National Vulnerability Database has rated Shellshock 10 out of 10 for severity, as it has the potential to cause serious damage. Through this bug, hackers can gain control of a user’s computer.

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, aka "ShellShock." NOTE: the original fix for this issue was incorrect; CVE-2014-7169 has been assigned to cover the vulnerability that is still present after the incorrect fix.

To test your server, run this command in BASH:

 env VAR='() { :;}; echo Bash is vulnerable!' bash -c "echo Bash Test"

If the script says Vulnerable, then you need to update your bash immediately!

yum clean all
yum update bash

 

[Mikaya]

Moved to a more suitable section. 😀

 

[USHost247]

Moved to a more suitable section. 😀

Hey thanks!

 

[froggyboy604]

Is there anything webmasters who use a shared linux web hosting plan can do to protect their site from Shellshock?

 

[USHost247]

Is there anything webmasters who use a shared linux web hosting plan can do to protect their site from Shellshock?

It was pointed mostly to Linux System Administrators. As long as the Administrator updated their bash, they will be safe from shellshock.