PHP global variables with the SESSION vulnerability, global and session-vulnerability warning-the black bar safety net
2012-07-24T00:00:00
ID MYHACK58:62201234420 Type myhack58 Reporter 佚名 Modified 2012-07-24T00:00:00
Description
The first to see this a simple piece of code
<? php
session_start();$_SESSION['isadmin']='yes';$isadmin='no';echo $_SESSION['isadmin'];?& gt;
When php. ini in the configuration register_globals = Off,
Without any problems,
Output yes but
When php. ini in the configuration register_globals = On time,
First run output yes
And refresh, the display is no obviously this is not normal,
This is a very strange problem,
If that is $isadmin='no'; change the SESSION, the
Then why for the first time will show yes? All know: when the configuration register_globals = On time,
By xxx. php? id=1 2 3 access, the program will automatically create a variable id
Then the automatically created variables will not change the SESSION?
Test code
<? php
//xxx.php
session_start();
echo $_SESSION['id'];
?& gt;
By xxx. php? id=1 2 3 access, no any output,
Okay, otherwise don't know will have how much
The use of SESSION do login
And the PHP configuration register_globals to On the website
Will be just the login. There are two commonly used function import_request_variables() and extract()
import_request_variables-will GET／POST／Cookie variables imported into the global scope
the extract -- from the array in the variables into the current symbol table
<? php
//xxx. phpimport_request_variables('G');
echo $id;?& gt;
When by xxx. php? id=1 2 3 access the time,
Even if register_globals is set to Off
Is also will output 123extract($_GET) and import_request_variables('G') function is similar to then try import_request_variables() and extract()creates variables will not affect the SESSION?
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