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From: Arno Welzel <usenet@arnowelzel.de>
Newsgroups: comp.lang.php
Subject: Re: i getting this warning
Date: Thu, 17 Nov 2011 15:15:14 +0100
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Jerry Stuckle, 2011-11-17 15:01:

> On 11/17/2011 8:31 AM, Arno Welzel wrote:
>> Denis McMahon, 2011-11-16 16:11:
>>
>>> On Wed, 16 Nov 2011 06:56:21 -0500, Jerry Stuckle wrote:
>>>
>>>> On 11/16/2011 6:17 AM, sri kanth wrote:
>>>
>>>>> $qs=$_REQUEST['id'];
>>>>> $data=mysql_query("select * from tbl_porduct where pid=$qs");
>>>
>>>> Three things.
>>>
>>> You missed "using unescaped user input in a query with no validation or
>>> verification". I know it's only a select, but would you bet that he's
>>> that sloppy with selects and yet rigorous with data changing statements?
>>
>> It does not matter what statement there *is*. Using data from outside in
>> this way makes *everything* possible - this is the typical mistake which
>> makes SQL injection possible!
>>
>>
>> Example:
>>
>> Lets assume $qs is "1;drop tlb_product".
>>
>> $data = mysql_query("select * from tbl_product where pid=$qs");
>>
>> The statement will be expanded to:
>>
>> "select * from tbl_product where pid=1;drop tbl_product"
>>
>> The result will be, that the table tbl_product will be dropped, if the
>> MySQL user has the right to drop tables.
>>
>>
> <snip>
> 
> The statement will fail because mysql_query() will not execute multiple 
> statements in a single query.

Generally and in this specific case you are right - but it is possible
and you should never rely on this behaviour.

See also: <http://php.net/manual/de/function.mysql-query.php>


-- 
Arno Welzel
http://arnowelzel.de
http://de-rec-fahrrad.de