(Reprise License Manager) RLM 14.2 - Unauthenticated User Enumeration

[Gionathan Reale via Fulldisclosure <fulldisclosure () seclists org>]

# 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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