Debian7离线升级bash漏洞—然后修复方法

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### 昨天还说的传说要又一次出补丁，今天就都出来了。基本操作一致就是測试结果不一样。继续修复 Debian7 wheezy版本号的bash漏洞，例如以下操作：

1、測试是否须要升级

# env x='() { :;}; echo vulnerable' bash -c "echo this is a test" #显演示样例如以下，须要升级

vulnerable

this is a test

2、离线升级

### 好多server不能出外网，仅仅能下载了升级了

# wget http://security.debian.org/debian-security/pool/updates/main/b/bash/bash_4.2+dfsg-0.1+deb7u3_amd64.deb

# dpkg -i bash_4.2+dfsg-0.1+deb7u3_amd64.deb

(Reading database ... 38868 files and directories currently installed.)

Preparing to replace bash 4.2+dfsg-0.1+deb7u1 (using bash_4.2+dfsg-0.1+deb7u3_amd64.deb) ...

Unpacking replacement bash ...

Setting up bash (4.2+dfsg-0.1+deb7u3) ...

update-alternatives: using /usr/share/man/man7/bash-builtins.7.gz to provide /usr/share/man/man7/builtins.7.gz (builtins.7.gz) in auto mode

Processing triggers for man-db ...

# dpkg -l bash # 查看升级后的版本号

Desired=Unknown/Install/Remove/Purge/Hold

| Status=Not/Inst/Conf-files/Unpacked/halF-conf/Half-inst/trig-aWait/Trig-pend

|/ Err?=(none)/Reinst-required (Status,Err: uppercase=bad)

||/ Name Version Architecture Description

+++-=====================-===============-===============-===============================================

ii bash 4.2+dfsg-0.1+de amd64 GNU Bourne Again SHell

# env x='() { :;}; echo vulnerable' bash -c "echo this is a test" # 示的例子中，下列的变化，升级完成

this is a test