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 Latest: MichaelSnaRe
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Full disclosure |
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IT Security and Insecurity Portal |
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Is this... ? |
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 Posted: Tue Jul 27, 2004 5:42 pm |
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| rain |
| Regular user |
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| Joined: Jun 29, 2004 |
| Posts: 12 |
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| Code: |
$result=mysql_query("SELECT * FROM user WHERE id='$id'",$db);
$row=mysql_fetch_row($result);
titulo("$row[1]");
echo"<p>$row[2]</p>";
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Is this vurnable to sql injection? I think it is??? |
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| Posted: Fri Aug 13, 2004 12:14 am |
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| Imster |
| Beginner |
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| Joined: Aug 13, 2004 |
| Posts: 3 |
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| 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>";
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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 $sfe;
}
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Then in the page you want to make safe...add this to the beginning:
| Code: |
include_once('safe_inc.php');
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And then when you want to make a var safe do:
| Code: |
MakeSafe($variable_name);
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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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| Posted: Sun Aug 15, 2004 9:30 pm |
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| madman |
| Active user |
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| Joined: May 24, 2004 |
| Posts: 46 |
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Just an addition. Use addslashes instead of stripslashes. 
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!
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. |
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_________________
ch88rs,
madman |
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| Posted: Wed Aug 18, 2004 10:55 am |
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| Imster |
| Beginner |
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| Joined: Aug 13, 2004 |
| Posts: 3 |
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heh thanks. Will change my habbit now  |
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| Posted: Wed Aug 18, 2004 7:42 pm |
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| madman |
| Active user |
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| Joined: May 24, 2004 |
| Posts: 46 |
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| To be honest, I never rely on addslashes() function only. |
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_________________
ch88rs,
madman |
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