How do CentOS and Ubuntu fix Linux bash vulnerabilities?

The recent Linux official built-in bash found a very serious security vulnerability, hackers can use this bash vulnerability to fully control the target system and launch an attack, in order to avoid your Linux server affected, we recommend that you complete the patch as soon as possible. Today Linux officials have given the latest solution to bash vulnerabilities, and no friends to fix bash vulnerabilities, please fix them ASAP. Here is a small compilation of the most commonly used Linux kernel CentOS and ubuntu server to fix bash vulnerabilities Ultimate fix method.

CentOS and Ubuntu the ultimate way to fix Linux bash vulnerabilities

　　Software and systems that have been identified for successful use: All Linux operating systems that install the GNU Bash version is less than or equal to 4.3.

"Bash vulnerability description" The flaw stems from the special environment variables that you created before the bash shell you invoked, which can contain code and be executed by bash.

　　"Vulnerability Detection Method"

Using vulnerability detection commands in server commands: Env-i x= ' () {(a) => ' bash-c ' echo date '; Cat Echo

Before fixing, the current system time is displayed, which indicates that the server has not been repaired, please fix it in time, the following is attached the Linux system repair program, including: CentOS and Ubuntu System final repair program.

　　First, CentOS final fix Bash vulnerability scenario

In the Server command box, type the following command to upgrade to fix the vulnerability:

Yum Clean All

Yum Makecache

YUM-Y Update Bash

　　Second, Ubuntu finally fixes the Bash vulnerability scenario, please run the following command

Apt-cache gencaches

Apt-get-y Install--only-upgrade Bash

After the above method is repaired, we run the detection command again: Env-i x= ' () {(a) => ' bash-c ' echo date '; Cat Echo

If the output is repaired using a patch solution: date, which means that the output contains a date string, indicates that the vulnerability fix succeeded.

Other Linux server Bash Vulnerability Ultimate Fix method

　　Special Note : This fix will not have any impact, if your script uses the above way to define environment variables, after repair your script execution will complain, in order to prevent accidental occurrence, we recommend that you execute the Linux server system disk before the backup.

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