<s>
IExpress	B-Application
,	O
a	O
component	O
of	O
Windows	B-Application
2000	I-Application
and	O
later	O
versions	O
of	O
the	O
operating	O
system	O
,	O
is	O
used	O
to	O
create	O
self-extracting	B-General_Concept
packages	I-General_Concept
from	O
a	O
set	O
of	O
files	O
.	O
</s>
<s>
IExpress	B-Application
(	O
IEXPRESS.EXE	B-Application
)	O
can	O
be	O
used	O
for	O
distributing	O
self-contained	O
installation	O
packages	O
(	O
INF-based	O
setup	O
executables	O
)	O
to	O
multiple	O
local	O
or	O
remote	O
Windows	O
computers	O
.	O
</s>
<s>
It	O
creates	O
a	O
self-extracting	B-General_Concept
executable	I-General_Concept
(	O
.EXE	O
)	O
or	O
a	O
compressed	O
Cabinet	O
(	O
.CAB	O
)	O
file	O
using	O
either	O
the	O
provided	O
front	O
end	O
interface	O
(	O
IExpress	B-Application
Wizard	O
)	O
,	O
or	O
a	O
custom	O
Self	O
Extraction	O
Directive	O
(	O
SED	O
)	O
file	O
.	O
</s>
<s>
SED	O
files	O
can	O
be	O
modified	O
with	O
any	O
plain	O
text/ASCII	O
editor	O
,	O
like	O
Notepad	B-Application
.	O
</s>
<s>
All	O
self-extracting	B-General_Concept
files	I-General_Concept
created	O
by	O
IExpress	B-Application
use	O
CAB	O
compression	O
algorithms	O
,	O
are	O
compressed	O
using	O
the	O
Cabinet	O
Maker	O
(	O
MAKECAB.EXE	O
)	O
tool	O
,	O
and	O
are	O
extracted	O
using	O
the	O
WExtract	O
(	O
WEXTRACT.EXE	O
)	O
tool	O
.	O
</s>
<s>
IEXPRESS.EXE	B-Application
is	O
located	O
in	O
the	O
SYSTEM32	O
folder	O
of	O
both	O
32	O
and	O
64-bit	O
installations	O
of	O
Windows	O
.	O
</s>
<s>
The	O
front	O
end	O
interface	O
(	O
IExpress	B-Application
Wizard	O
)	O
can	O
be	O
started	O
by	O
manually	O
navigating	O
to	O
the	O
respective	O
directory	O
and	O
opening	O
the	O
executable	O
(	O
IExpress.exe	B-Application
)	O
,	O
or	O
by	O
typing	O
IExpress	B-Application
into	O
the	O
Run	O
window	O
of	O
the	O
Start	O
Menu	O
.	O
</s>
<s>
IExpress	B-Application
Wizard	O
interface	O
guides	O
the	O
user	O
through	O
the	O
process	O
of	O
creating	O
a	O
self-extracting	O
package	O
.	O
</s>
<s>
The	O
self-extracting	B-General_Concept
packages	I-General_Concept
created	O
with	O
IExpress	B-Application
have	O
(	O
inherent	O
)	O
vulnerabilities	O
which	O
allow	O
arbitrary	O
code	O
execution	O
because	O
of	O
the	O
way	O
they	O
handle	O
their	O
installation	O
command	O
and	O
their	O
command	O
line	O
processing	O
.	O
</s>
<s>
The	O
latter	O
has	O
been	O
fixed	O
by	O
Microsoft	O
in	O
MS14-049	O
,	O
but	O
the	O
former	O
is	O
only	O
addressed	O
by	O
a	O
policy	O
to	O
deprecate	O
IExpress	B-Application
.	O
</s>
<s>
There	O
is	O
also	O
a	O
DLL	O
hijacking	O
exploit	O
possible	O
with	O
IExpress	B-Application
.	O
</s>
