Linux服务器入侵实例分析(一)
Linux服务器入侵实例分析(一)
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
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