full-disclosure - heise Security: Password exposure in Lotus Notes

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Date: Thu, 19 Jul 2007 20:30:16 +0200 (CEST)
From: Juergen Schmidt <ju@...sec.de>
To: Juergen Schmidt <ju@...sec.de>
Subject: heise Security: Password exposure in Lotus Notes

Excerpt from: http://www.heise-security.co.uk/news/92958

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Password exposure in Lotus Notes

A debug function in version 5 and up of Lotus Notes can be used to write a 
file containing the new password in plain text when a user password is 
changed. This function has been designed to bring more transparency into 
password quality verification. If two additional lines are entered in the 
Notes.INI configuration file, Notes will log the evaluation.

Since the Notes.INI file on a user’s hard disk must be manipulated, 
physical access to the system is required to exploit this flaw. But there 
are various possibilities within Notes to manipulate this file, which can, 
in turn, also be used to protect systems from this vulnerability.

Assessment:

Notes uses the password to protect the certificate storage Notes.ID used 
by every user for authentication. This file is encrypted or decrypted with 
the user password. Together with the Notes certificates, Notes.ID also 
stores the user's private key and X.509 certificates, where required. For 
this reason, it is of utmost importance to ensure that nobody can create a 
copy of the password and Notes.ID at the same time. If somebody gains 
concurrent access to both the log file and the Notes.ID, this person can 
authenticate himself to Notes at any time.

Even though administrators can eliminate exploitation of this debug 
function in most cases, a Notes administrator with appropriate privileges 
is able to discover all user passwords. Some Notes customers have 
implemented complex solutions to allow for the central storage of password 
changes, while resetting passwords is only possible based on the four-eye 
principle, i.e. administration and revision must work together to do so. 
The debug function makes it possible to bypass this security policy.
(Volker Weber)
------

For a more detailed analysis, please see the original article on: 
http://www.heise-security.co.uk/news/92958

bye, ju

-- 
Juergen Schmidt, editor-in-chief heise Security www.heise-security.co.uk
GPG-Key: 0x38EA4970,  5D7B 476D 84D5 94FF E7C5  67BE F895 0A18 38EA 4970
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