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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
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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.
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