[FD] (Reprise License Manager) RLM 14.2 - Unauthenticated User Enumeration

[Gionathan Reale via Fulldisclosure <fulldisclosure@xxxxxxxxxxxx>]

# Product: Reprise License Manager 14.2
# Vendor: Reprise Software 
# CVE ID: CVE-2021-44155
# Vulnerability Title: Unauthenticated User Enumeration
# Severity: Low 
# Author(s): Mark Staal Steenberg, Bilal El Ghoul, Gionathan Armando Reale, 
Andreas Fyhn Andersen, Oliver Lind Nordestgaard 
# Date: 2021-11-25
#############################################################
Introduction: 
An issue was discovered in /goform/login_process in RLM 14.2. When an attacker 
attempts to login, the response if an username is valid includes "Login 
Failed", but does not include this string if the username is invalid. This 
allows an attacker to enumerate valid users.

Vulnerability: 
This vulnerability is triggered upon failed authentication, if an attacker 
supplies an invalid user with an invalid password no error message is given 
however if an attacker supplies the application with a valid user with an 
invalid password an error message is displayed informing the user "Login 
Failed". The difference in response can be abused in order to allow an attacker 
to enumerate valid users.
 
Recommendation:
We recommend displaying generic error messages upon failed authentication to 
mitigate the possibility of an attacker enumerating valid users.

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