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www.waraxe.us Forum Index -> Sql injection -> Is this... ?
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Is this... ?
PostPosted: Tue Jul 27, 2004 5:42 pm Reply with quote
rain
Regular user
Regular user
 
Joined: Jun 29, 2004
Posts: 12




Code:

$result=mysql_query("SELECT * FROM user WHERE id='$id'",$db);
$row=mysql_fetch_row($result);

titulo("$row[1]");
echo"<p>$row[2]</p>";


Is this vurnable to sql injection? I think it is???
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PostPosted: Fri Aug 13, 2004 12:14 am Reply with quote
Imster
Beginner
Beginner
 
Joined: Aug 13, 2004
Posts: 3




Quote:
Code:

$result=mysql_query("SELECT * FROM user WHERE id='$id'",$db);
$row=mysql_fetch_row($result);

titulo("$row[1]");
echo"<p>$row[2]</p>";



Is this vurnable to sql injection? I think it is???


It depends on the variable $id, if you are using stripslashes() then your fairly safe (safer than not using it anyway).

Code:

$id = stripslashes($id);

$result=mysql_query("SELECT * FROM user WHERE id='$id'",$db);
$row=mysql_fetch_row($result);

titulo("$row[1]");
echo"<p>$row[2]</p>";


Or if your going to be passing all sorts of variables at different times on different pages...you could make a custom function and include it on all pages where you want to make a variable safe. For example:

Make the file safe_inc.php and put:
Code:

function MakeSafe($sfe)
{
     $sfe = stripslashes($sfe);
    // add any custom code to make vars safe
     return $sfe;
}


Then in the page you want to make safe...add this to the beginning:

Code:

include_once('safe_inc.php');


And then when you want to make a var safe do:
Code:

MakeSafe($variable_name);



I know its a long post to a simple question but I just wanted to show the methods to make vars safe in PHP in case any of you were at all interested. If not then I just wasted a minute of your life..

(Ps hi people im new here)
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PostPosted: Sun Aug 15, 2004 9:30 pm Reply with quote
madman
Active user
Active user
 
Joined: May 24, 2004
Posts: 46




Just an addition. Use addslashes instead of stripslashes. Smile
This code can be used to sanitize single- or double-quote regardless of magic quotes in effect:
Code:
function quote_me($str) {
  while (preg_match('/\[\'"]?/', $str)) $str = stripslashes($str);
  return addslashes($str);
}

$id = "0' OR password<>'";

$id = quote_me($id);
$sql = "SELECT username FROM table WHERE id = '$id'";


Use the previous method (that was called "safe" stripslashes), this is what we got:
Code:
SELECT username FROM table WHERE id = '0' OR password<>''

It will produce a doom! Smile

Using addslashes, the SQL query string would be:
Code:
SELECT username FROM table WHERE id = '0\' OR password=\''

That's what should called S A F E.

_________________
ch88rs,
madman
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PostPosted: Wed Aug 18, 2004 10:55 am Reply with quote
Imster
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Joined: Aug 13, 2004
Posts: 3




heh thanks. Will change my habbit now Embarassed
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PostPosted: Wed Aug 18, 2004 7:42 pm Reply with quote
madman
Active user
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Joined: May 24, 2004
Posts: 46




To be honest, I never rely on addslashes() function only. Smile

_________________
ch88rs,
madman
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