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AUSCERT External Security Bulletin Redistribution
ESB-2007.0836 -- [Win]
Lotus Notes Memory Mapped Files Vulnerability
24 October 2007
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AusCERT Security Bulletin Summary
---------------------------------
Product: Lotus Notes
Lotus Domino
Publisher: Symantec
Operating System: Windows
Impact: Inappropriate Access
Access: Existing Account
CVE Names: CVE-2007-5544
Original Bulletin:
http://www.symantec.com/content/en/us/enterprise/research/SYMSA-2007-013.txt
http://www-1.ibm.com/support/docview.wss?rs=477&uid=swg21257030
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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:
research@symantec.com
For details on Symantec's Vulnerability Reporting Policy:
http://www.symantec.com/research/Symantec-Responsible-Disclosure.pdf
Symantec Vulnerability Research Advisory Archive:
http://www.symantec.com/research/
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
registered trademarks of Symantec Corp. and/or affiliated companies
in the United States and other countries. All other registered and
unregistered trademarks represented in this document are the sole
property of their respective companies/owners.
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