<s>
Apache	B-Application
suEXEC	B-Application
is	O
a	O
feature	O
of	O
the	O
Apache	B-Application
web	I-Application
server	I-Application
.	O
</s>
<s>
It	O
allows	O
users	O
to	O
run	O
Common	B-Language
Gateway	I-Language
Interface	I-Language
(	O
CGI	O
)	O
and	O
Server	O
Side	O
Includes	O
(	O
SSI	O
)	O
applications	O
as	O
a	O
different	O
user	O
.	O
</s>
<s>
Normally	O
,	O
all	O
web	B-Application
server	I-Application
processes	O
run	O
as	O
the	O
default	O
web	B-Application
server	I-Application
user	O
(	O
often	O
wwwrun	O
,	O
www-data	B-Application
,	O
apache	B-Application
or	O
nobody	B-Operating_System
)	O
.	O
</s>
<s>
The	O
suEXEC	B-Application
feature	O
consists	O
of	O
a	O
module	O
for	O
the	O
web	B-Application
server	I-Application
and	O
a	O
binary	B-Application
executable	I-Application
which	O
acts	O
as	O
a	O
wrapper	O
.	O
</s>
<s>
suEXEC	B-Application
was	O
introduced	O
in	O
Apache	B-Application
1.2	O
and	O
is	O
often	O
included	O
in	O
the	O
default	O
Apache	B-Application
package	O
provided	O
by	O
most	O
Linux	B-Application
distributions	I-Application
.	O
</s>
<s>
If	O
a	O
client	O
requests	O
a	O
CGI	O
and	O
suEXEC	B-Application
is	O
activated	O
,	O
it	O
will	O
call	O
the	O
suEXEC	B-Application
binary	B-Application
which	O
then	O
wraps	O
the	O
CGI	B-Language
scripts	I-Language
and	O
executes	O
it	O
under	O
the	O
user	O
account	O
of	O
the	O
server	O
process	O
(	O
virtual	O
host	O
)	O
defined	O
in	O
the	O
virtual	O
host	O
directive	O
.	O
</s>
<s>
Additionally	O
,	O
suEXEC	B-Application
perform	O
a	O
multi-step	O
check	O
on	O
the	O
executed	O
CGI	O
to	O
ensure	O
security	O
for	O
the	O
server	O
(	O
including	O
path-checks	O
,	O
a	O
limit	O
of	O
permitted	O
commands	O
,	O
etc	O
.	O
)	O
</s>
<s>
User	O
"	O
Alice	O
"	O
has	O
a	O
website	O
including	O
some	O
Common	B-Language
Gateway	I-Language
Interface	I-Language
script	O
files	O
in	O
her	O
own	O
public_html	O
(	O
a	O
common	O
web	O
root	O
directory	O
name	O
)	O
folder	O
,	O
which	O
can	O
be	O
accessed	O
by	O
https://example.com/~alice	O
.	O
</s>
<s>
User	O
"	O
Bob	O
"	O
now	O
views	O
Alice	O
's	O
webpage	O
,	O
which	O
requires	O
Apache	B-Application
to	O
run	O
one	O
of	O
these	O
CGI	B-Language
scripts	I-Language
.	O
</s>
<s>
Instead	O
of	O
running	O
all	O
scripts	O
as	O
"	O
wwwrun	O
"	O
(	O
which	O
results	O
in	O
the	O
need	O
that	O
all	O
scripts	O
have	O
to	O
be	O
readable	O
and	O
executable	B-Application
for	O
the	O
"	O
wwwrun	O
"	O
group	O
if	O
the	O
file	O
is	O
owned	O
by	O
that	O
group	O
or	O
for	O
all	O
users	O
otherwise	O
)	O
,	O
the	O
scripts	O
in	O
/home/alice/public_html	O
will	O
be	O
wrapped	O
using	O
suEXEC	B-Application
and	O
run	O
with	O
Alice	O
's	O
user	O
ID	O
resulting	O
in	O
higher	O
security	O
and	O
eliminating	O
the	O
need	O
to	O
make	O
the	O
scripts	O
readable	O
and	O
executable	B-Application
for	O
all	O
users	O
or	O
everyone	O
in	O
the	O
"	O
wwwrun	O
"	O
group	O
(	O
instead	O
only	O
Alice	O
herself	O
needs	O
to	O
be	O
able	O
to	O
run	O
the	O
script	O
)	O
.	O
</s>
