Groups > comp.databases.ms-sqlserver > #1867

Re: SQl -injection

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From	"Tony Johansson" <johansson.andersson@telia.com>
Newsgroups	comp.databases.ms-sqlserver
Subject	Re: SQl -injection
Date	Thu, 29 Jan 2015 11:03:22 +0100
Organization	A noiseless patient Spider
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Yes I can understant why it fetches alla the rows now.
Many thanks.

//Tony

"Lennart Jonsson" <erik.lennart.jonsson@gmail.com> skrev i meddelandet 
news:maaotr$e36$1@dont-email.me...
> On 2015-01-28 12:45, Tony Johansson wrote:
>> In the form there is a text field for name
>>
>> This query is meant to be used like his
>> select Namn, Adress, Telefonnummer
>> from Abonnent
>> where Namn = 'Olle Karlsson'      //This name is fetched from the text
>> field name in the form
>> and hemligtNummer = false;
>>
>> If now the user enter some strange character in the text field in the
>> form like this
>> select Namn, Adress, Telefonnummer
>> from Abonnent
>> where Namn = 'Olle Karlsson' or 'a'='a' or 'a'='a'
>> and hemligtNummer = false;
>>
>> I don't understand how the second query can result that all rows will be
>> fetched
>>
>
> The where clause evaluates to
>
>     where Namn = 'Olle Karlsson'
>        or 'a'='a'
>        or ('a'='a' and hemligtNummer = false);
>
>
> /Lennart
>
>

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Thread

SQl -injection "Tony Johansson" <johansson.andersson@telia.com> - 2015-01-28 12:45 +0100
  Re: SQl -injection Lennart Jonsson <erik.lennart.jonsson@gmail.com> - 2015-01-28 14:41 +0100
    Re: SQl -injection "Tony Johansson" <johansson.andersson@telia.com> - 2015-01-29 11:03 +0100
  Re: SQl -injection Erland Sommarskog <esquel@sommarskog.se> - 2015-01-28 13:45 +0000

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