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www.waraxe.us Forum Index -> Sql injection -> secure nuke_authors
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secure nuke_authors
PostPosted: Fri May 21, 2004 10:04 pm Reply with quote
Spacebom
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Joined: May 20, 2004
Posts: 6
Location: Valladolid - Spain




Hi guys:

Almost all of PHP-Nuke atacks try to get nuke_authors information, and i think that writte this code in mainfile.php is nice:

Code:

if (stristr($_SERVER["QUERY_STRING"],'%20union%20')|| stristr($_SERVER["QUERY_STRING"],'%20nuke_authors%20')) {
    echo "<center>Parametros no permitidos<br><a href=\"http://www.desarrollonuke.org\">DesarrolloNuke</a></center>";
    exit;
}


Do you think that it's good?

Good night.

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http://www.desarrolloNuke.org - Seguridad, desarrollo, y soporte avanzado a la comunidad Hispana.
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PostPosted: Sat May 22, 2004 2:00 am Reply with quote
waraxe
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Joined: May 11, 2004
Posts: 2407
Location: Estonia, Tartu




This can be evaded by "/**/union/**/" and "/**/nuke_authors/**/"
And sql injection can be done through POST or COOKIE array, so this security trap only helps against the simplest of attacks.
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hrmm
PostPosted: Sat May 22, 2004 2:02 am Reply with quote
icenix
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Joined: May 13, 2004
Posts: 106
Location: Australia




waraxe could do answer it better than me but i would say
that it would still be possible to use something like
Code:

/**/UN/**/ION

to get past your filter...sure enough it could block a few attacks

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PostPosted: Sat May 22, 2004 3:01 pm Reply with quote
Spacebom
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Joined: May 20, 2004
Posts: 6
Location: Valladolid - Spain




hmmm, yeah, you have reason, thank u very much-

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PostPosted: Mon May 31, 2004 5:10 am Reply with quote
b0ilz
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Joined: May 31, 2004
Posts: 10




/**/UN/**/ION will only work with some databases to evade this. mySQL treats /**/ as a field seporator. So this will not work.

as for the check. it is flawed as waraxe stated. Also, checking for such things is ok. but what if the query_string is manipulated? like how php will do url decoding on the query string when it assigns $_request ($_GET, $_POST, $_COOKIES) or when doing register_globals assignments. Also other string manipulation later might change something in the query_string.

checking for union and nuke_authors is a bad idea. it will deny many false positives if you check for it in POST data, and it will not do any good if you dont check in POST data.

Forget CMS, do html yourself Smile just a suggestion.
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secure nuke_authors
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