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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 (at) symantec (dot) com [email concealed]

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

To Report a Security Vulnerability in a Symantec Product:

secure (at) symantec (dot) com [email concealed]

For general information on Symantec's Product Vulnerability

reporting and response:

http://www.symantec.com/security/

Symantec Product Advisory Archive:

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

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 (at) symantec (dot) com. [email concealed]

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.

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