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SYMSA-2007-013: Lotus Notes Memory Mapped Files Vulnerability
From: research () symantec com
Date: 23 Oct 2007 15:11:51 -0000

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                     Symantec Vulnerability Research
                     http://www.symantec.com/research
                           Security Advisory

   Advisory ID: SYMSA-2007-013
Advisory Title: Lotus Notes Memory Mapped Files Vulnerability
        Author: Ollie Whitehouse / ollie_whitehouse () symantec com
  Release Date: 23-10-2007
   Application: Lotus Notes / Domino
      Platform: Microsoft Windows
      Severity: Session hijacking in shared user environments
                / Data leakage in shared user environments
 Vendor status: Updated Application Versions Available
    CVE Number: CVE-2007-5544
     Reference: http://www.securityfocus.com/bid/26146


Overview:

  Lotus Domino is a client/server product designed for collaborative
  working environments. Domino is designed for e-mail, scheduling,
  instant messaging and data driven applications.

  There exists a vulnerability in the way memory mapped files are
  used under Windows. The result of which is that if the Lotus Notes
  Client is used in a Microsoft Terminal Services or Citrix
  environment users can read each others Lotus Notes session data
  including items such as E-Mail.

  This vulnerability also impacts the server product.


Details:

  The vulnerability arises due to the mechanism used for
  Inter-Process Communication (IPC) between NLNOTES and NTASKLDR.
  IPC is performed via memory mapped files. When the files are
  created a NULL is passed to the ACL parameter resulting in EVERYONE
  being granted 'full-control'.

  The result of this is that an attacker can read the contents of
  any users Lotus Notes session when deployed in shared user
  environments such as Terminal Services or Citrix. The data which is
  accessible ranges from e-mail through to databases and associated
  Lotus Script.

  It should be noted that this vulnerability could also be used to
  write to the memory mapped files. The impact of which is that an
  attacker could potentially inject active content such as Lotus
  Script.


Vendor Response:

  * Fixed for the Notes client with 6.5.6, 7.0.3 and 8.0
  * Fixed for the Domino server with 6.5.5 FP3, 6.5.6, 7.0.2
    FP1, 7.0.3, 8.0
    
  The fix requires that "SharedMemoryAllowOnly=1" be set in the
  notes.ini file. Additional details about the notes.ini variable
  is available in technote #1257030
  
  http://www-1.ibm.com/support/docview.wss?rs=477&uid=swg21257030


Recommendation:

  Update to a secure version of Notes client and Domino server.
  Implement the appropriate notes.ini fix.


Common Vulnerabilities and Exposures (CVE) Information:

The Common Vulnerabilities and Exposures (CVE) project has assigned
the following names to these issues.  These are candidates for
inclusion in the CVE list (http://cve.mitre.org), which standardizes
names for security problems.


  CVE-2007-5544

- -------Symantec Vulnerability Research Advisory Information-------

For questions about this advisory, or to report an error:
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For details on Symantec's Vulnerability Reporting Policy:
http://www.symantec.com/research/Symantec-Responsible-Disclosure.pdf

Symantec Vulnerability Research Advisory Archive:
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Symantec Vulnerability Research GPG Key:
http://www.symantec.com/research/Symantec_Vulnerability_Research_GPG.asc

- -------------Symantec Product Advisory Information-------------

To Report a Security Vulnerability in a Symantec Product:
secure () symantec com 

For general information on Symantec's Product Vulnerability
reporting and response:
http://www.symantec.com/security/

Symantec Product Advisory Archive:
http://www.symantec.com/avcenter/security/SymantecAdvisories.html

Symantec Product Advisory PGP Key:
http://www.symantec.com/security/Symantec-Vulnerability-Management-Key.asc

- ---------------------------------------------------------------

Copyright (c) 2007 by Symantec Corp.
Permission to redistribute this alert electronically is granted
as long as it is not edited in any way unless authorized by
Symantec Consulting Services. Reprinting the whole or part of
this alert in any medium other than electronically requires
permission from research () symantec com 

Disclaimer
The information in the advisory is believed to be accurate at the
time of publishing based on currently available information. Use
of the information constitutes acceptance for use in an AS IS
condition. There are no warranties with regard to this information.
Neither the author nor the publisher accepts any liability for any
direct, indirect, or consequential loss or damage arising from use
of, or reliance on, this information.

Symantec, Symantec products, and Symantec Consulting Services are
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property of their respective companies/owners.
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