相伴江湖 -- Be With You

发贴者：龙牙草时间 5/31/2023 11:04:00 下午 | 0 条评论

Welcome to my another PHP and MYSQL tutorial. In the previous I've discussed about the data insertion into database by using PHP and MYSQL. So i did successfully in the previous video.

In this video tutorial I'll discuss How to fetch data from the database called as data fetching. It's really a simple thing to access your data which is in database. You just have to do a little work for this. For fetching data you have follow some steps.

How to Fetch Data from Database

Step 1:

Make a connection with your database which i did in the previous blog.

Step 2:

If you wanna fetching a values in "form" or in a table so just have to create a form, table or whatever you want in HTML. I've created a table where I'll show you how to fetch data in table form.

Step 3:

Write a query SELECT * FROM table_Name;

Step 4:

Create a Loop for fetching all the data on a single click.

Step 5:

Create variables for the sake of storing a different values from the combined values in the loop variable like:

//while loop to fetch all the values from the database and stored in the variable named "row".

while($row = mysql_fetch_array(mysql_query($conn,$query))){

$name = $row['username']; //$name will save all the username values from the loop variable 'row'.

$pass = $row['password']; //$pass will save the password values from the loop variable 'row'.

}

Now watch the video for better understanding.

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发贴者：龙牙草时间 5/31/2023 02:15:00 下午 | 0 条评论

In this article we are going to do the SQL Injection (Blind) challenge of DVWA.
OWASP describes Blind SQL Injection as:
"Blind SQL (Structured Query Language) injection is a type of attack that asks the database true or false questions and determines the answer based on the applications response. This attack is often used when the web application is configured to show generic error messages, but has not mitigated the code that is vulnerable to SQL injection.

When an attacker exploits SQL injection, sometimes the web application displays error messages from the database complaining that the SQL Query's syntax is incorrect. Blind SQL injection is nearly identical to normal , the only difference being the way the data is retrieved from the database. When the database does not output data to the web page, an attacker is forced to steal data by asking the database a series of true or false questions. This makes exploiting the SQL Injection vulnerability more difficult, but not impossible."

To follow along click on the SQL Injection (Blind) navigation link. You will be presented with a page like this:

Lets first try to enter a valid User ID to see what the response looks like. Enter 1 in the User ID field and click submit. The result should look like this:

Lets call this response as valid response for the ease of reference in the rest of the article. Now lets try to enter an invalid ID to see what the response for that would be. Enter something like 1337 the response would be like this:

We will call this invalid response. Since we know both the valid and invalid response, lets try to attack the app now. We will again start with a single quote (') and see the response. The response we got back is the one which we saw when we entered the wrong User ID. This indicates that our query is either invalid or incomplete. Lets try to add an or statement to our query like this:

' or 1=1-- -

This returns a valid response. Which means our query is complete and executes without errors. Lets try to figure out the size of the query output columns like we did with the sql injection before in Learning Web Pentesting With DVWA Part 2: SQL Injection.
Enter the following in the User ID field:

' or 1=1 order by 1-- -

Again we get a valid response lets increase the number to 2.

' or 1=1 order by 2-- -

We get a valid response again lets go for 3.

' or 1=1 order by 3-- -

We get an invalid response so that confirms the size of query columns (number of columns queried by the server SQL statement) is 2.
Lets try to get some data using the blind sql injection, starting by trying to figure out the version of dbms used by the server like this:

1' and substring(version(), 1,1) = 1-- -

Since we don't see any output we have to extract data character by character. Here we are trying to guess the first character of the string returned by version() function which in my case is 1. You'll notice the output returns a valid response when we enter the query above in the input field.
Lets examine the query a bit to further understand what we are trying to accomplish. We know 1 is the valid user id and it returns a valid response, we append it to the query. Following 1, we use a single quote to end the check string. After the single quote we start to build our own query with the and conditional statement which states that the answer is true if and only if both conditions are true. Since the user id 1 exists we know the first condition of the statement is true. In the second condition, we extract first character from the version() function using the substring() function and compare it with the value of 1 and then comment out the rest of server query. Since first condition is true, if the second condition is true as well we will get a valid response back otherwise we will get an invalid response. Since my the version of mariadb installed by the docker container starts with a 1 we will get a valid response. Lets see if we will get an invalid response if we compare the first character of the string returned by the version() function to 2 like this:

1' and substring(version(),1,1) = 2-- -

And we get the invalid response. To determine the second character of the string returned by the version() function, we will write our query like this:
1' and substring(version(),2,2) = 1-- -
We get invalid response. Changing 1 to 2 then 3 and so on we get invalid response back, then we try 0 and we get a valid response back indicating the second character in the string returned by the version() function is 0. Thus we have got so for 10 as the first two characters of the database version. We can try to get the third and fourth characters of the string but as you can guess it will be time consuming. So its time to automate the boring stuff. We can automate this process in two ways. One is to use our awesome programming skills to write a program that will automate this whole thing. Another way is not to reinvent the wheel and try sqlmap. I am going to show you how to use sqlmap but you can try the first method as well, as an exercise.
Lets use sqlmap to get data from the database. Enter 1 in the User ID field and click submit.
Then copy the URL from the URL bar which should look something like this
http://localhost:9000/vulnerabilities/sqli_blind/?id=1&Submit=Submit
Now open a terminal and type this command:

sqlmap --version

this will print the version of your sqlmap installation otherwise it will give an error indicating the package is not installed on your computer. If its not installed then go ahead and install it.
Now type the following command to get the names of the databases:

sqlmap -u "http://localhost:9000/vulnerabilities/sqli_blind/?id=1&Submit=Submit" --cookie="security=low; PHPSESSID=aks68qncbmtnd59q3ue7bmam30" -p id

Here replace the PHPSESSID with your session id which you can get by right clicking on the page and then clicking inspect in your browser (Firefox here). Then click on storage tab and expand cookie to get your PHPSESSID. Also your port for dvwa web app can be different so replace the URL with yours.
The command above uses -u to specify the url to be attacked, --cookie flag specifies the user authentication cookies, and -p is used to specify the parameter of the URL that we are going to attack.
We will now dump the tables of dvwa database using sqlmap like this:

sqlmap -u "http://localhost:9000/vulnerabilities/sqli_blind/?id=1&Submit=Submit" --cookie="security=low; PHPSESSID=aks68qncbmtnd59q3ue7bmam30" -p id -D dvwa --tables

After getting the list of tables its time to dump the columns of users table like this:

sqlmap -u "http://localhost:9000/vulnerabilities/sqli_blind/?id=1&Submit=Submit" --cookie="security=low; PHPSESSID=aks68qncbmtnd59q3ue7bmam30" -p id -D dvwa -T users --columns

And at last we will dump the passwords column of the users table like this:

sqlmap -u "http://localhost:9000/vulnerabilities/sqli_blind/?id=1&Submit=Submit" --cookie="security=low; PHPSESSID=aks68qncbmtnd59q3ue7bmam30" -p id -D dvwa -T users -C password --dump

Now you can see the password hashes.
As you can see automating this blind sqli using sqlmap made it simple. It would have taken us a lot of time to do this stuff manually. That's why in pentests both manual and automated testing is necessary. But its not a good idea to rely on just one of the two rather we should leverage power of both testing types to both understand and exploit the vulnerability.
By the way we could have used something like this to dump all databases and tables using this sqlmap command:

sqlmap -u "http://localhost:9000/vulnerabilities/sqli_blind/?id=1&Submit=Submit" --cookie="security=low; PHPSESSID=aks68qncbmtnd59q3ue7bmam30" -p id --dump-all

But obviously it is time and resource consuming so we only extracted what was interested to us rather than dumping all the stuff.
Also we could have used sqlmap in the simple sql injection that we did in the previous article. As an exercise redo the SQL Injection challenge using sqlmap.

References:

1. Blind SQL Injection: https://owasp.org/www-community/attacks/Blind_SQL_Injection
2. sqlmap: http://sqlmap.org/
3. MySQL SUBSTRING() Function: https://www.w3schools.com/sql/func_mysql_substring.asp

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发贴者：龙牙草时间 5/31/2023 05:06:00 上午 | 0 条评论

I did a quick video last night for someone on proxying the newer version of Android SDK with Genymotion as the changes back in version 7 make it a bit more difficult to proxy https traffic and I get a lot of questions on a regular basis even years later...

Hopefully this video helps anyone else out that may be running into the same troubles.. This is proxying the latest version of android as of this writing which is version 10 but should work just fine on newer versions unless there is a major change in the future again that specifically restricts this method..

Mobile Hacking - Proxying Newer Versions of Android with Burp and Genymotion:

You can follow along with the video but additionally for reference below are the commands used:

Step 1: Create a Burp Cert for Android

1. Export the certificate from burp to .DER format via the proxy tab import/export

2. Change the format from der to pem:

openssl x509 -inform DER -in cacert.der -out cacert.pem

3. Pull the hash of the certificate subject name and rename the cert to the hah.0 format:

openssl x509 -inform PEM -subject_hash_old -in cacert.pem |head -1

mv cacert.pem <hash>.0

Step 2: Create a new Emulator:

1. Create a version 10 Galaxy x10 with bridge mode networking (or whatever newest version required)

2. Click 3 dots under my installed devices in genymotion --> Edit --> Change to bridged mode

Step 3: Setup certificate on device

1. Check devices and push the certificate to the SD card:

adb devices

adb push <hash.0> /sdcard/

2. Connect to the device and install the cert with proper permissions:

adb remount

adb shell

mv /sdcard/<hash.0> /system/etc/security/cacerts/

chmod 644 /system/etc/security/cacerts/<hash.0>

3. Reboot the device:

reboot

Step 4: Verify and setup the proxy:

1. Settings --> search for Trusted --> Scroll down till you see portswigger

2. Setup your Burp proxy to the correct IP/Port combo of your external interface IP

3. In Genymotion click Settings --> wifi --> Gear -> Pencil Icon -> Add in Proxy info under advanced

4. Go forth and proxy things

相伴江湖 -- Be With You

2023年5月31日星期三

How To Fetch Data From The Database | Tutorial 4

How to Fetch Data from Database

More information

Learning Web Pentesting With DVWA Part 3: Blind SQL Injection

References:

Related news

Proxying Newer Versions Of Android With Genymotion

Mobile Hacking - Proxying Newer Versions of Android with Burp and Genymotion:

You can follow along with the video but additionally for reference below are the commands used:

Step 1: Create a Burp Cert for Android

Step 2: Create a new Emulator:

Step 3: Setup certificate on device

Step 4: Verify and setup the proxy:

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2023年5月30日星期二

2302 Interesting News

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