Check Linux Bash security vulnerabilities and repair solutions for each environment

Today Red Hat announced that it discovered that Bash Shell has a security vulnerability. Hackers can use the vulnerability to launch attacks. In short, the problem is very serious. Since it is discovered, we must solve the problem. For a while, we still haven’t figured out the specific reason. , in short, just fix the loopholes. Theoretically speaking, since it has been announced, it means that this vulnerability has been discovered long ago. Now that it has been announced, we must solve it, because users with ulterior motives will show their skills in turn.

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First, detect whether there is a Bash vulnerability

Second, upgrade bash patches for different systems

First, detect whether there is a Bash vulnerability

env -i X=\\\'() { (a)=>\\\\\\’ bash -c \\’echo date\\’; cat echo

Execute the above command, if the following feedback message appears saying that there is a vulnerability that needs to be patched.

If the above characters appear, it means there is a vulnerability, and then see the following to upgrade the patch according to different system environments.

Second, upgrade bash patches for different systems

What Snail needs to say is that in case we need to make a backup first, in case there is an incompatibility problem and a system error occurs, we can also make a remedial backup. If snapshot backup is possible, snapshot backup will be performed. Otherwise, backup the website and database. . At the time of writing this article, Snail has been successfully tested on centos and debian.

A – centos system

yum clean allyum makecacheyum -y update bash

If it is a centos system, just run the simple script above.

B – Ubuntu system

apt-get updateapt-get -y install –only-upgrade bash

C – debian system

If it is 7.5 64-bit && 32-bit environment running

apt-get updateapt-get -y install –only-upgrade bash

If running in 6.0.x 64-bit environment

wget https://soft.laozuo.org/systems/bash_4.1-3+deb6u2_amd64.deb&& dpkg -i bash_4.1-3+deb6u2_amd64.deb

If running in 6.0.x 32-bit environment

wget https://soft.laozuo.org/systems/bash_4.1-3+deb6u2_i386.deb&&dpkg -i bash_4.1-3+deb6u2_i386.deb

Finally, let’s see what the feedback information looks like when we run the first step of script detection.

If you can see:

date

This kind of feedback information indicates that the patch is completed. Support We have completed the fix for the Linux Bash security vulnerability.

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