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             AUSCERT External Security Bulletin Redistribution

                               ESB-2013.0593
  Security Bulletin: For safer IBM Notes single sign on with Windows, use
        Notes Shared Login or Notes Federated Login (CVE-2013-0522)
                               29 April 2013

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        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           IBM Notes
Publisher:         IBM
Operating System:  Windows
Impact/Access:     Access Confidential Data -- Existing Account
Resolution:        Mitigation
CVE Names:         CVE-2013-0522  

Original Bulletin: 
   http://www-01.ibm.com/support/docview.wss?uid=swg21634508

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Security Bulletin: For safer IBM Notes single sign on with Windows, use Notes 
Shared Login or Notes Federated Login (CVE-2013-0522)

Document information

IBM Notes

Security

Software version:
8.0, 8.0.1, 8.0.2, 8.5, 8.5.1, 8.5.2, 8.5.3, 9.0

Operating system(s):
Windows

Reference #:
1634508

Modified date:
2013-04-24

Abstract

Notes Client Single Logon uses an operating system communication mechanism for 
password transmission between Windows and Notes that can be attacked by 
malicious code planted on the user workstation to reveal the user password. 
To prevent the potential for attack, disable Notes Client Single Logon and 
instead opt to use the more secure Notes Shared Login or Notes Federated Login.

Content

CVE ID: CVE-2013-0522

DESCRIPTION

When adopting any single sign on solution, administrators face the tough 
trade-off between usability (a single password granting access to multiple 
systems) and better security (different passwords for different systems). 
A single password for multiple systems is obviously popular with users, while 
different passwords for different systems is popular with security-minded 
administrators. However, when these administrators prevail, users often 
resort to writing down multiple passwords. And so grows the demand for 
better single sign on solutions.
Notes Client Single Logon uses an operating system communication mechanism for 
password transmission between Windows and Notes that can be attacked by 
malicious code planted on the user workstation to reveal the password of an 
authenticated user. To prevent the potential for attack, disable Notes Client 
Single Logon and instead opt to use the more secure Notes Shared Login or 
Notes Federated Login.

For more information on Notes Shared Login, see
- - Using Notes Shared Login to suppress password prompts

For more information on Notes Federated Login, see section "Using Security 
Assertion Markup Language (SAML) to configure federated-identity 
authentication" in
- - IBM Domino 9.0 Administrator Help

For more information on disabling Notes Client Single Logon, refer to the Note
in the following Help topic:
- - Using Notes client single logon to synchronize Notes and OS passwords

For a comparison of Notes Client Single Logon and Notes Shared Login, see 
technote 1437726.

CVSS:

Using the Common Vulnerability Scoring System (CVSS) v2, the security rating 
for this issue is:

CVSS Base Score: 4.1
CVSS Temporal Score: See http://xforce.iss.net/xforce/xfdb/82531 for the 
current score.
CVSS Environmental Score: Undefined
CVSS String: (AV:L/AC:M/Au:S/C:P/I:P/A:P)
Access Vector: Local Access Complexity: Medium
Authentication: Single Confidentiality Impact: Partial
Integrity Impact: Partial Availability Impact: Partial

AFFECTED PLATFORMS
Any version of IBM Notes running on Windows with Notes Client Single 
Logon enabled.

REMEDIATION:

Workaround:
To prevent the potential for attack, disable Notes Client Single Logon and 
instead opt to use the more secure Notes Shared Login or Notes Federated Login.

Mitigation(s):
1. For your Notes Execution Control list settings for -Default- and 
- -No Signature-, do NOT allow access to File system, External code or 
External programs.
2. Frequently change your Windows password with length and complexity 
commensurate to the information it protects.
3. Use Windows screen saver password to prevent unauthorized access to your 
workstation.

References: 

Complete CVSS Guide 
On-line Calculator V2 
CVE-2013-0522 
X-Force Vulnerability Database: http://xforce.iss.net/xforce/xfdb/82531 

Related Information: 

IBM Product Security Incident Response Program 

ACKNOWLEDGEMENT 
This vulnerability was reported to IBM by Markus Piéton of it.sec GmbH & 
Co. KG.

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