Operating System:

[Win]

Published:

06 June 2016

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2016.1417
             Security Bulletin: IBM Client Application Access
         InstallShield vulnerable to DLL planting (CVE-2016-2542)
                                6 June 2016

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

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

Product:           IBM Client Application Access
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=swg21981968

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Security Bulletin: IBM Client Application Access InstallShield vulnerable to
DLL planting (CVE-2016-2542)

Security Bulletin

Document information

More support for:

IBM Client Application Access

Software version:

1.0, 1.0.0.1

Operating system(s):

Windows

Reference #:

1981968

Modified date:

2016-06-03

Summary

IBM Client Application Access 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 local attacker to gain elevated
privileges on the system, caused by an untrusted search path. An attacker
could exploit this vulnerability using a Trojan horse DLL in the current
working directory of a setup-launcher executable file to gain elevated
privileges 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 Client
Application Access

- - IBM Client Application Access 1.0.0

- - IBM Client Application Access 1.0.0.1

- - IBM Client Application Access 1.0.0.1 Interim Fix 1

NOTE:

Remediation/Fixes

Prepare scripts based on the following samples and use these scripts to
launch installers of affected IBM Client Application Access versions.

Use this script to launch IBM Client Application Access Web Kit installer

ICAAWebkit.bat
http://www-01.ibm.com/support/docview.wss?uid=swg21981968&aid=1

Use this script to launch IBM Client Application Access Standard Kit installer 
from a network share location 

ICAAStdkit_network.bat
http://www-01.ibm.com/support/docview.wss?uid=swg21981968&aid=3

Use this script to launch IBM Client Application Access Standard Kit installer

ICAAStdkit.bat
http://www-01.ibm.com/support/docview.wss?uid=swg21981968&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.

- --------------------------END INCLUDED TEXT--------------------

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