[FD] (Reprise License Manager) RLM 14.2 - Unauthenticated Session Hijacking

[Gionathan Reale via Fulldisclosure <fulldisclosure@xxxxxxxxxxxx>]

# Product: Reprise License Manager 14.2
# Vendor: Reprise Software 
# CVE ID: CVE-2021-44151
# Vulnerability Title: Unauthenticated Session Hijacking
# Severity: Medium/High   
# Author(s): Mark Staal Steenberg, Bilal El Ghoul, Gionathan Armando Reale, 
Andreas Fyhn Andersen, Oliver Lind Nordestgaard   
# Date: 2021-11-25
#############################################################
Introduction:
As the session cookies are short and simple, an attacker can hijack any 
existing sessions by bruteforcing the 4 hex-character session cookie on the 
Windows version (the Linux version appears to have 8 characters). An attacker 
can obtain the static part of the cookie (cookie name) by first making a 
request to any page on the application (e.g.,/goforms/menu) and saving the name 
of the cookie sent with the response.
The attacker can then use the name of the cookie and try to request that same 
page, setting a random value for the cookie. If any user has an active session, 
the page should return with the authorized content, when a valid cookie value 
is hit.

Vulnerability:
Due to the session cookies being rather simple and predictable, a single 
session, can be brute forced in less than 3 minutes, on a laptop, and can 
therefore be considered very insecure.

Recommendation:
It is recommended to follow industry standards and use secure randomized 
complex session cookies which expire when not in use or the user 
de-authenticates.

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