Taltech Tal Bar Code ActiveX Control Memory Corruption Vulnerability(-ies)

["sapheal-hack.pl" <sapheal@xxxxxxx>]

    Taltech Tal Bar Code ActiveX Control Memory Corruption 
Vulnerability(-ies)
    Michal Bucko (sapheal)
    hack.pl





    I. BACKGROUND

The Bar Code ActiveX Control has all the features necessary to easily add
 professional quality barcodes to any Windows application including Web 
pages,
database reporting and labeling, product packaging, document tracking, 
postal
bar coding and special purpose bar code labeling applications.
It is an extremely easy and powerful tool that will work flawlessly with 
any
Windows application that supports ActiveX technology including Visual 
Basic,
C++, Internet Explorer Web pages, Microsoft Word, Excel, Access, etc.

    II. DESCRIPTION

The vulnerability lies in SaveBarCode function. The vulnerability allows
arbitrary code execution (in the context of current user) via a web 
browser.
The debug snippet shows what happened to the default exception handler:

41414141 Pointer to next SEH record
41414141 SE Handler

Return address and default exception handler were overwritten.

The other interesting vulnerability (but much of a different character,
though) allows storage of files on the remote machine. The files contain
bar codes, however, such an issue might be exploited to store thousands of
files on the remote machine. The sample exploit for the second 
vulnerability
is very simple and looks the following way (windows script file [wsf]):

<?XML version='1.0' standalone='yes' ?>
<package><job id='DoneInVBS' debug='false' error='true'>
<object classid='clsid:C917E12F-9757-11D2-85DB-F01851C10000' id='target' />
<script language='vbscript'>


arg="somefilename"

target.SaveBarCode arg

</script></job></package>