Operating System:

[Win]

Published:

06 June 2016

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===========================================================================
             AUSCERT External Security Bulletin Redistribution

                               ESB-2016.1418
       Security Bulletin: IBM Notes InstallShield vulnerable to DLL
                         planting (CVE-2016-2542)
                                6 June 2016

===========================================================================

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

Product:           IBM Notes
Publisher:         IBM
Operating System:  Windows
Impact/Access:     Increased Privileges -- Existing Account
Resolution:        Patch/Upgrade
CVE Names:         CVE-2016-2542  

Reference:         ESB-2016.0805

Original Bulletin: 
   http://www.ibm.com/support/docview.wss?uid=swg21979808

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Security Bulletin: IBM Notes InstallShield vulnerable to DLL planting
(CVE-2016-2542)

Security Bulletin

Document information

More support for:

IBM Notes

Security

Software version:

8.5, 8.5.1, 8.5.2, 8.5.3, 9.0, 9.0.1

Operating system(s):

Windows

Reference #:

1979808

Modified date:

2016-06-03

Summary

IBM Notes uses InstallShield which generates install executables that are
vulnerable to a DLL-planting vulnerability.

Vulnerability Details

CVEID: CVE-2016-2542

DESCRIPTION

Flexera InstallShield could allow a remote attacker to execute arbitrary
code on the system. The application does not directly specify the fully
qualified path to a dynamic-linked library (schannel.dll) when running on
Microsoft Windows. By persuading a victim to open a specially-crafted file
from a WebDAV or SMB share using a vulnerable application, a remote attacker
could exploit this vulnerability via a specially-crafted library to execute
arbitrary code on the system.

CVSS Base Score: 7.8

CVSS Temporal Score: See

https://exchange.xforce.ibmcloud.com/vulnerabilities/110914

for the current score

CVSS Environmental Score*: Undefined

CVSS Vector: (CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H)

Affected Products and Versions

This vulnerability affects installers of following versions of IBM Notes

- - IBM Notes 9.0.1

- - IBM Notes 9.0

- - IBM Notes 8.5.3

- - IBM Notes 8.5.2

- - IBM Notes 8.5.1

- - IBM Notes 8.5

This vulnerability does not affect Fix Pack or Interim Fix installers.

This vulnerability does not affect installed versions of IBM Notes.

Remediation/Fixes

Prepare scripts based on following samples and use these scripts to launch
insallers of affected IBM Notes versions.

Use this script to launch Notes Web Kit installer

NotesWebkit.bat
http://www-01.ibm.com/support/docview.wss?uid=swg21979808&aid=1

Use this script to launch Notes standard kit instaler from a network share 
location 

NotesStdkit_network.bat
http://www-01.ibm.com/support/docview.wss?uid=swg21979808&aid=3

Use this script to launch Notes/ICAA Standard kit installer 

NotesStdkit.bat
http://www-01.ibm.com/support/docview.wss?uid=swg21979808&aid=5

Workarounds and Mitigations

Before the install begins, copy the two library files mapistub.dll and
mapi32.dll from the system directory to the installer's directory. This will 
ensure the library files will be loaded correctly.

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References

Complete CVSS v3 Guide

On-line Calculator v3

Related information

IBM Secure Engineering Web Portal

IBM Product Security Incident Response Blog

Change History

03 June 2016 - Initial publication.

*The CVSS Environment Score is customer environment specific and will
ultimately impact the Overall CVSS Score. Customers can evaluate the impact
of this vulnerability in their environments by accessing the links in the
Reference section of this Security Bulletin.

Disclaimer

According to the Forum of Incident Response and Security Teams (FIRST), the
Common Vulnerability Scoring System (CVSS) is an "industry open standard
designed to convey vulnerability severity and help to determine urgency and
priority of response." IBM PROVIDES THE CVSS SCORES "AS IS" WITHOUT WARRANTY
OF ANY KIND, INCLUDING THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
FOR A PARTICULAR PURPOSE. CUSTOMERS ARE RESPONSIBLE FOR ASSESSING THE IMPACT
OF ANY ACTUAL OR POTENTIAL SECURITY VULNERABILITY.

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