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Vulnerability of Flexera InstallShield, JRSoft Inno Setup: code execution via DLL-planting

Synthesis of the vulnerability 

An attacker can create a malicious DLL for Flexera InstallShield or JRSoft Inno Setup, in order to run code with administrator privileges.
Impacted software: NetWorker, FortiClient, Db2 UDB, Notes by IBM, Tivoli Storage Manager, WebSphere MQ, Notepad++, PuTTY, X2GoClient.
Severity of this computer vulnerability: 3/4.
Creation date: 09/05/2016.
Revisions dates: 02/06/2016, 06/07/2016.
Références of this announce: 1610582, 1978168, 1978363, 1979808, 1980839, 1982467, 1982741, 1982809, 1983796, 1983797, 1983813, 1983814, 1983815, 1984184, 1984743, 1984863, 494999, CVE-2016-2542, ESA-2017-008, FG-IR-16-046, VIGILANCE-VUL-19558.

Description of the vulnerability 

The products Flexera InstallShield and JRSoft Inno Setup are used to create installation program for software packages.

In some cases, the generated programs load extension modules the name and possible locations depend on the considered package. However, in some cases, the installer looks for these extension DLL in folders which are writeable by unprivileged users, while the installation program that loads and run this DLL is expected to be run by an administrator. A typical case of this is the download folder of a browser. One should note that these installers are expected to be run only a few times, so possibilities of exploit attempts are rare.

This bug has also been reported for other products in the bulletin VIGILANCE-VUL-18671.

An attacker can therefore create a malicious DLL for Flexera InstallShield or JRSoft Inno Setup, in order to run code with administrator privileges.
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This cybersecurity threat impacts software or systems such as NetWorker, FortiClient, Db2 UDB, Notes by IBM, Tivoli Storage Manager, WebSphere MQ, Notepad++, PuTTY, X2GoClient.

Our Vigil@nce team determined that the severity of this computer threat note is important.

The trust level is of type confirmed by the editor, with an origin of document.

A proof of concept or an attack tool is available, so your teams have to process this alert. An attacker with a technician ability can exploit this security threat.

Solutions for this threat 

Flexera InstallShield, JRSoft Inno Setup, Notepad++: workaround for DLL-planting.
A workaround is to unpack raw archives instead of running the installer :
  https://notepad-plus-plus.org/repository/6.x/6.9.2/npp.6.9.2.bin.zip
See also VIGILANCE-SOL-44346.

EMC NetWorker: solution for InstallShield.
The solution is indicated in information sources.

FortiClient Installer: solution for DLL-planting.
The FortiClientOnlineInstaller.exe installer published after the 11/08/2016 has to be used.

IBM DB2: version 10.1 Fix Pack 6.
The version 10.1 Fix Pack 6 is fixed.

IBM Notes: workaround for DLL planting.
IBM provides scripts that wraps the installer and ensures that the first DLL found is the right one:
  http://www-01.ibm.com/support/docview.wss?uid=swg21979808&aid=1
  http://www-01.ibm.com/support/docview.wss?uid=swg21979808&aid=3
  http://www-01.ibm.com/support/docview.wss?uid=swg21979808&aid=5

IBM Spectrum Protect for Workstations: patch for Flexera InstallShield.
A patch is indicated in information sources.

IBM Tivoli Storage Manager: patch for Flexera InstallShield.
A patch is indicated in information sources.

IBM WebSphere MQ: solution for Flexera InstallShield.
The solution is indicated in information sources.

PuTTY: version 0.67.
The version 0.67 is fixed:
  http://www.chiark.greenend.org.uk/~sgtatham/putty/
Please use https://the.earth.li/~sgtatham/putty/latest/x86/putty-0.67-installer.msi instead of https://the.earth.li/~sgtatham/putty/latest/x86/putty-0.67-installer.exe for MS-Windows because of VIGILANCE-VUL-19558.

X2Go Client: version 4.1.0.0.
The version 4.1.0.0 is fixed:
  http://code.x2go.org/releases/binary-win32/x2goclient/releases/4.1.0.0-2017.03.11/
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