Linux Bash严重漏洞修复紧急通知
日前Linux官方内置Bash中新发现一个非常严重安全漏洞（漏洞参考https://access.redhat.com/security/cve/CVE-2014-6271 ），黑客可以利用该Bash漏洞完全控制目标系统并发起攻击，为了避免您Linux服务器受影响，建议您尽快完成漏洞修补！修补方案请参考论坛http://bbs.aliyun.com/read.php?tid=176977，请了解！
【已确认被成功利用的软件及系统】
所有安装GNU bash 版本小于或者等于4.3的Linux操作系统。
【漏洞描述】
该漏洞源于你调用的bash shell之前创建的特殊的环境变量，这些变量可以包含代码，同时会被bash执行。
【漏洞检测方法】
修复前
输出:
vulnerable
this is a test
使用修补方案修复后
bash: warning: x: ignoring function definition attempt
bash: error importing function definition for `x'
this is a test
特别提示：该修复不会有任何影响，如果您的脚本使用以上方式定义环境变量，修复后您的脚本执行会报错。
【建议修补方案 】
请您根据Linux版本选择您需要修复的命令， 为了防止意外情况发生，建议您执行命令前先对Linux服务器系统盘打个快照，如果万一出现升级影响您服务器使用情况，可以通过回滚系统盘快照解决。
centos:
yum -y update bash
ubuntu:
14.04 64bit
wget http://mirrors.aliyun.com/fix_stuff/bash_4.3-7ubuntu1.1_amd64.deb && dpkg -i bash_4.3-7ubuntu1.1_amd64.deb
14.04 32bit
wget http://mirrors.aliyun.com/fix_stuff/bash_4.3-7ubuntu1.1_i386.deb && dpkg -ibash_4.3-7ubuntu1.1_i386.deb
12.04 64bit
wget http://mirrors.aliyun.com/fix_stuff/bash_4.2-2ubuntu2.2_amd64.deb && dpkg -ibash_4.2-2ubuntu2.2_amd64.deb
12.04 32bit
wget http://mirrors.aliyun.com/fix_stuff/bash_4.2-2ubuntu2.2_i386.deb && dpkg -ibash_4.2-2ubuntu2.2_i386.deb
10.10 64bit
wget http://mirrors.aliyun.com/fix_stuff/bash_4.1-2ubuntu3.1_amd64.deb && dpkg -i bash_4.1-2ubuntu3.1_amd64.deb
10.10 32bit
wget http://mirrors.aliyun.com/fix_stuff/bash_4.1-2ubuntu3.1_i386.deb && dpkg -i bash_4.1-2ubuntu3.1_i386.deb
debian:
7.5 64bit && 32bit
apt-get -y install --only-upgrade bash
6.0.x 64bit
wget http://mirrors.aliyun.com/debian/pool/main/b/bash/bash_4.1-3%2bdeb6u1_amd64.deb &&dpkg -i bash_4.1-3+deb6u1_amd64.deb
6.0.x 32bit
wget http://mirrors.aliyun.com/debian/pool/main/b/bash/bash_4.1-3%2bdeb6u1_i386.deb &&dpkg -i bash_4.1-3+deb6u1_i386.deb
opensuse:
13.1 64bit
wget http://mirrors.aliyun.com/fix_stuff/bash-4.2-68.4.1.x86_64.rpm && rpm -Uvh bash-4.2-68.4.1.x86_64.rpm
13.1 32bit
wget http://mirrors.aliyun.com/fix_stuff/bash-4.2-68.4.1.i586.rpm && rpm -Uvh bash-4.2-68.4.1.i586.rpm
aliyun linux:
5.x 64bit
wget http://mirrors.aliyun.com/centos/5/updates/x86_64/RPMS/bash-3.2-33.el5.1.x86_64.rpm && rpm -Uvh bash-3.2-33.el5.1.x86_64.rpm
5.x 32bit
wget http://mirrors.aliyun.com/centos/5/updates/i386/RPMS/bash-3.2-33.el5.1.i386.rpm && rpm -Uvh bash-3.2-33.el5.1.i386.rpm
测试漏洞过程：
To test if your version of Bash is vulnerable to this issue, run the following command:
$ env x='() { :;}; echo vulnerable'bash -c "echo this is a test"
If the output of the above command looks as follows:
vulnerable
this is a test
you are using a vulnerable version of Bash. The patch used to fix this issue ensures that no code is allowed after the end of a Bash function. Thus, if you run the above example with the patched version of Bash, you should get an output similar to:
$ env x='() { :;}; echo vulnerable'bash -c "echo this is a test"
bash: warning: x: ignoring function definition attempt
bash: error importing function definition for `x'
this is a test
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