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www.waraxe.us Forum Index -> Sql injection -> getting table names in MySQL
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getting table names in MySQL
PostPosted: Wed Aug 02, 2006 11:48 pm Reply with quote
redstar
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Joined: Aug 03, 2006
Posts: 1




on a website, i found a few php scripts, where it's possible to inject sql commands. THe problem is, i dont know the table name of the table, where the interesting stuff ist stored. Is it possible to get a list of existing tables via SELECT statements (or to execute a shell command)?
Server: MySQL 4.0.23
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PostPosted: Thu Aug 03, 2006 3:05 pm Reply with quote
waraxe
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Joined: May 11, 2004
Posts: 2407
Location: Estonia, Tartu




Finding out table and column names in mysql through sql injection can be complicated.
And in many cases (most cases?) it is impossible.

Possibilities:

1. If attacker has file privileges (and in real world it's rare situation), then
"load_file()" can be used for scripts source reading. This can give out database structure details,
hardcoded in scripts.
Example from realworld attack:

http://www.******.ee/index.php?act=otsi&search=1&otsing=-99%'+UNION+ALL+SELECT+load_file(CHAR(99,58,92,119,105,110,100,111,119,115,92,112,104,112,46,105,110,105)),2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,
17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,
33,34,35,36,37,38,39,40/*

2. In case of mysql >= 5.0.4 attacker can try to use "INFORMATION_SCHEMA" database.

http://dev.mysql.com/doc/refman/5.0/en/information-schema.html

Quote:

Each MySQL user has the right to access these tables, but can see only the rows in the tables
that correspond to objects for which the user has the proper access privileges


3. Bruteforce - this method can be used against all mysql versions, but it will succeed only, if
table/column names are short or if they can be found from wordlists/dictionaries.
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getting table names in MySQL
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