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.

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
该漏洞源于调用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

env x='() { :;}; echo vulnerable' bash -c "echo this is a test" 

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 

修补方案
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 -i  bash_4.3-7ubuntu1.1_i386.deb 

12.04 64bit

wget http://mirrors.aliyun.com/fix_stuff/bash_4.2-2ubuntu2.2_amd64.deb && dpkg -i  bash_4.2-2ubuntu2.2_amd64.deb 

12.04 32bit

wget http://mirrors.aliyun.com/fix_stuff/bash_4.2-2ubuntu2.2_i386.deb && dpkg -i  bash_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 

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