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OK, it's time we cover a blind squirrel injection so we already know what SQL injection is.

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We know how it works and we know how we can exploit it.

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But what is this injection?

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Well, let me show you let's navigate to our W a log in to our page.

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Navigate to blind Eskil injection, and if you remember how we actually managed to discover whether

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Enescu injection was present on an application or not is we used a single quote, and once we entered

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that single quote, it would give us an error or it would give us some error message or possibly even

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the query itself where the error occurs.

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That's how we would know that this input is not really getting filtered.

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Well, if I click submit on blindest injection.

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Nothing happens, it's as if this application is not vulnerable, doesn't give any error, we can type

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anything with as many single quotes as we want and nothing will happen.

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Any character that we input will just get processed by the application and it will retrieve the same

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page back to us.

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So does that mean that it's not vulnerable?

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Well, it could be that there is also blindest conjecture injection, which means it's not giving us

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any error back, but it's still vulnerable to the scale injection.

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OK, but how can we figure out whether the skull injection is present in this application?

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Well, let's try specifying the correct input first.

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So if it just type one and click on submit, it will give me an idea of and it will give me its first

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name and last name.

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If I type, for example, to, I will give Gordon Brown and so on, so on so we can select one user

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ID right here and we get one output back.

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Same goes if we, for example, try one single coat or one equals one or one equals two, let's try

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it like that so we don't get admin back.

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But it could be due to two reasons.

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Reason number one, it's not vulnerable to injection or reason.

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Number two, it only this argument is satisfied if no one exists, but one is not equal to two.

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So this part is not satisfied.

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Therefore we only get the output for adding.

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But if we were to type one single coat or single coat, one single coat equals one press enter.

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We get all the users from the application.

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Now we don't get their usernames, passwords.

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However, we do get all of them out, put it right here.

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And this would be a good indication that there is a possible ESKIL injection in the application.

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Why?

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Well, because this application is not meant to output 20 users.

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It's only meant to output one.

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And with this statement, we told the application we want the ID number one or if one equals to one,

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and it gave us all the other I.D. And that is one of the ways we can discover whether it has some vulnerabilities

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in the application.

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Now, how can you explain this?

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Well, here is where the problem occurs.

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Exploiting blindest an injection is much, much longer and harder than exploiting an error based ESKIL

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injection.

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For example, here, we can't really output the database name.

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We need to guess because we're not getting any output back or any error back.

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So how can we go about getting the database named papal name, the column name and all of that?

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First of all, to keep in mind is that it takes a lot of time to do that.

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So for the purposes of this call, we will only show how we can get the database.

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To access the database we can use and Eskil like Operator and you can find it on this page, describes

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what exactly does it do?

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The like operator is used in our work force to search for a specified pattern in the column, since

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we don't really know how the database is called or we do actually know how it's called, but only because

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we exploited it in the previous lecture.

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We know that the database name is Steve.

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This is the name of the database.

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But let's pretend that we don't know it.

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We want to discover it by exploiting blindest conjecture.

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We could do it like this, we could type one single quote for the ID and database, since we know Israel

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has this database function and then this like operator, which has Syntex of open code, then the letter

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that you want to use, lets go with letter A and then the percent sign.

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What does this mean?

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Well, this line simply says that we're checking whether the database name starts with a and this person

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sign simply replaces all the other characters that could come after.

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So we're only checking whether the first letter of the database is a let's press enter.

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We get nothing back.

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Why is that?

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Well, it's because the first letter of database is not a therefore it didn't give us any output back

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if we were to type something like this and database and then we switch a with the because our database

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does start with the and the click submit.

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Now we get output back and now we would know that the database name starts with letter D.

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As you can only imagine, this can take a lot of time to guess and we could use the help of purposes

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to do this.

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So let's go to Burset.

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Let's turn on the intercept.

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Let's type.

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One, and perhaps we just type it in first and then I'm going to intercept someone and database like.

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Hey.

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Let's start with a once again just for the purposes of showing how this would work and then we intercept

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the request.

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Now we want to send this request to intruder.

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Let's hope that we can turn off the intercept and go back to the intruder.

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We want to select the positions and here we want to clear all of these positions, find the letter A.

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which is right here, and then add a position to it, since that is the only thing that we want to use

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as our paillard.

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Once we do that, we want to go to payloads and here we want to load all of the letters possible, so

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we'll just go A, B, C, D, E, F, G, and here I loaded all of the possible letters that could be

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the first letter of the database.

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So once without all the letters, we want to go to options.

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And here in the correct match, we can clear everything.

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And ad, for example, ad, so if we find the word admin in the page, then we're going to assume that

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we found the correct letter.

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Why is that?

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Well, if we get the correct output, it will output this that has admin right here.

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Or matter of fact, just so we can get even clearer response, let's copy this and parse string, which

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is first name Edman, and let's face it right here.

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Then we add it right here, and if our response finds this string inside of the code, that means we

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found the correct letter.

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All we need to do right now is start the attack.

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And here it is, we already get our response letter, the is checked, it has first name admin in the

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family response.

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It also has a different length of the response than all the other letters, as we can see right here.

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Now that we guessed the first letter, we would cancel this.

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We would go back to the positions and we would, first of all, clear this, remove the A and type the

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after type the we once again type it.

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Then we select a once again as the second letter since we already guessed first and now our command

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looks something like this.

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One and database

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like open quote the A percent, now we're guessing the second letter.

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OK, if I submit this for once again, not give any back because A is not the second letter.

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So let's see which letter is the second one.

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We can start the attack.

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Let's wait for this to finish.

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And here it is, a letter V is the second letter.

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Now we can go on to the third letter.

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So the B A, we once again selected.

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We started the attack.

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And here it is, it appears that W. is the next or third the latter.

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Let's add it right here.

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And let's add a at the end, select A and from the attack once again.

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And we get the response straight away, a is the fourth letter now we got the full name of the database.

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Now if we try to type like this and database like.

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Dve e

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submit, now we get the response back and here we can see that this is the name of our database and

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you will have to do this for every database, name, table, name and all of that.

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So now you notice why this is much longer to perform and much harder.

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Nonetheless, we covered it.

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We know how it works.

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We know that if we don't get any error once we specify the input doesn't mean that there is no ESKIL

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injection.

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We can also try something like making the application sleep for three seconds, which is also an indication

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that there could be an actual injection if the application does slip for three seconds after our comment

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nonetheless.

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Thank you for watching this lecture.

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And in the next video, we're going to start off with XML XPath Injection Suder.