SYMSA-2007-013: Lotus Notes Memory Mapped Files Vulnerability

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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 / [email protected]
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

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