Re: Lotus Notes Stored Form Vulnerability

[Derek Reynolds <dreynol () columbus rr com>]

Yeah I can confirm this works.   I tested this awhile ago.  Used the
postopen event and utilized LotusScripts ability to access open APIs.
I successfully was able to remotely reboot a users computer, remove their task bar among other
things.

You could litterly copy/paste the mellisa virus code into the postopen
even and it would act the same way the virus did with
Outlook/Exchange since the development environment is mimicked after
VBA.

Again, this would have to be crafted by someone with a developer ID
and the memo would have to be sent internally.  Not near as big a threat.



--
Best regards,
 Derek                            mailto:dreynol () columbus rr com

Friday, February 09, 2001, 11:13:29 AM, you wrote:

CJ> _________________________________________________________________________

CJ>   Security Advisory:    Lotus Notes Stored Form Vulnerability
CJ>   Date:                         8th February 2001
CJ>   Author:               Chris Jones (aka dp) dp () ic-crypt com
CJ>   Versions Affected:    At present only Lotus Notes v4.6 has been tested
CJ> _________________________________________________________________________


CJ> ----[ Exploit Introduction ] ------------------------------------------
CJ> Due to the design flaws of Lotus Notes databases, a user with sufficient knowledge can craft a Lotus Notes Email in 
such a way that the recipient only has to open the email or view the email
CJ> using the preview panes to become infected or to run the arbitrary code.

CJ> The problem lies in Lotus Notes ability to allow developers to create forms that do not rely on a specific template 
in a database (like normal emails) but instead uses its own in built templates
CJ> that travel within the document. Using these methods an experienced Lotus Notes developer could create an email 
enabled worm specifically for Lotus Notes networks. Which could do anything from
CJ> delete a few files to granting ACL rights to the persons mail box (so all emails could be viewed) to retrieving the 
users cached passwords or similar information. Another key point that allows
CJ> this exploit to occur is that the design of the mailbox database has by default been allowed to accept stored forms.


CJ> ----[ Exploit Generation ] ---------------------------------------------
CJ> To generate the email a malicious user will need to modify the default 'memo' form's design - which does require a 
developer's edition of Lotus Notes. The malicious user then has to modify the
CJ> forms' properties so the 'Store form in Document' action is checked. The malicious user then has a choice he could 
insert code into the forms 'PostOpen' event, which requires Lotus Script
CJ> programming knowledge or he can go the easy method and modify the forms 'Launch' properties which allows you to 
launch the first document attachment when opened which could be absolutely anything.


CJ> ----[ Quick Fix ] ------------------------------------------------------
CJ> There is a very quick and very easy method of disabling this feature and that is to modify the mailbox database 
properties so that the 'Allow stored forms' is unchecked. This will stop any forms
CJ> of this attack.


CJ> ----[ Platforms Tested ] -----------------------------------------------
CJ> We tested this exploit out using Lotus Notes version 4.6 but any version of Lotus Notes 4 should be affected, as I 
am sure lower and higher versions would be as well. In our experiment I was able
CJ> to gain manager access to someone else's Email Box using 4 Lines of Lotus Script code.


CJ> ----[ Other Notes ] ----------------------------------------------------
CJ> Using Lotus Script you can even change the source address of the email to fool the user into believing that the 
infected email came from a trusted source. You could even go so far as to code the
CJ> email so it looks at the target's mailbox and creates a duplicate document of his most recent email, so it looks as 
some other user has sent him two copies of the same email.

CJ> _________________________________________________________________________
CJ> -   www.progenic.com    -
CJ> _________________________________________________________________________



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