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Crouzet em4 soft 1.1.04 / M3 soft 3.1.2.0 Insecure File Permissions

Crouzet em4 soft 1.1.04 / M3 soft 3.1.2.0 Insecure File Permissions
Posted Mar 1, 2016
Authored by LiquidWorm | Site zeroscience.mk

em4 soft and M3 soft both suffer from a privilege escalation vulnerability. Executables can be changed by an authenticated user due to improper permissions.

tags | exploit
SHA-256 | 8486cbd36e94575449d27d839503870c0fd038f9e1b6b4bd2374d7c9f725f9ca

Crouzet em4 soft 1.1.04 / M3 soft 3.1.2.0 Insecure File Permissions

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Crouzet em4 soft 1.1.04 and M3 soft 3.1.2.0 Insecure File Permissions


Vendor: Crouzet Automatismes SAS
Product web page: http://www.crouzet-automation.com
Affected version: em4 soft (1.1.04 and 1.1.03.01)
M3 soft (3.1.2.0)

Summary: em4 is more than just a nano-PLC. It is a leading
edge device supported by best-in-class tools that enables
you to create and implement the smartest automation applications.
Millenium 3 (M3) is easy to program and to implement, it enables
the control and monitoring of machines and automation installations
with up to 50 I/O. It is positioned right at the heart of the
Crouzet Automation range.

Desc: em4 soft and M3 soft suffers from an elevation of privileges
vulnerability which can be used by a simple authenticated user that can
change the executable file with a binary of choice. The vulnerability
exist due to the improper permissions, with the 'C' flag (Change) for
'Everyone' group.

Tested on: Microsoft Windows 7 Professional SP1 (EN)
Microsoft Windows 7 Ultimate SP1 (EN)


Vulnerability discovered by Gjoko 'LiquidWorm' Krstic
@zeroscience


Advisory ID: ZSL-2016-5310
Advisory URL: http://www.zeroscience.mk/en/vulnerabilities/ZSL-2016-5310.php


25.01.2016

--


C:\Program Files (x86)\Crouzet automation>cacls "em4 soft"
C:\Program Files (x86)\Crouzet automation\em4 soft Everyone:(OI)(CI)C
NT SERVICE\TrustedInstaller:(ID)F
NT SERVICE\TrustedInstaller:(CI)(IO)(ID)F
NT AUTHORITY\SYSTEM:(ID)F
NT AUTHORITY\SYSTEM:(OI)(CI)(IO)(ID)F
BUILTIN\Administrators:(ID)F
BUILTIN\Administrators:(OI)(CI)(IO)(ID)F
BUILTIN\Users:(ID)R
BUILTIN\Users:(OI)(CI)(IO)(ID)(special access:)
GENERIC_READ
GENERIC_EXECUTE

CREATOR OWNER:(OI)(CI)(IO)(ID)F


C:\Program Files (x86)\Crouzet automation>cd "em4 soft"

C:\Program Files (x86)\Crouzet automation\em4 soft>cacls *.exe
C:\Program Files (x86)\Crouzet automation\em4 soft\em4 soft.exe Everyone:(ID)C
NT AUTHORITY\SYSTEM:(ID)F
BUILTIN\Administrators:(ID)F
BUILTIN\Users:(ID)R

C:\Program Files (x86)\Crouzet automation\em4 soft\unins000.exe Everyone:(ID)C
NT AUTHORITY\SYSTEM:(ID)F
BUILTIN\Administrators:(ID)F
BUILTIN\Users:(ID)R


C:\Program Files (x86)\Crouzet automation\em4 soft>


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


C:\Program Files (x86)\Crouzet Automatismes>cacls "Millenium 3"
C:\Program Files (x86)\Crouzet Automatismes\Millenium 3 Everyone:(OI)(CI)C
NT SERVICE\TrustedInstaller:(ID)F
NT SERVICE\TrustedInstaller:(CI)(IO)(ID)F
NT AUTHORITY\SYSTEM:(ID)F
NT AUTHORITY\SYSTEM:(OI)(CI)(IO)(ID)F
BUILTIN\Administrators:(ID)F
BUILTIN\Administrators:(OI)(CI)(IO)(ID)F
BUILTIN\Users:(ID)R
BUILTIN\Users:(OI)(CI)(IO)(ID)(special access:)
GENERIC_READ
GENERIC_EXECUTE

CREATOR OWNER:(OI)(CI)(IO)(ID)F


C:\Program Files (x86)\Crouzet Automatismes>cd "Millenium 3"

C:\Program Files (x86)\Crouzet Automatismes\Millenium 3>cacls *.exe
C:\Program Files (x86)\Crouzet Automatismes\Millenium 3\M3 soft.exe Everyone:(ID)C
NT AUTHORITY\SYSTEM:(ID)F
BUILTIN\Administrators:(ID)F
BUILTIN\Users:(ID)R

C:\Program Files (x86)\Crouzet Automatismes\Millenium 3\unins000.exe Everyone:(ID)C
NT AUTHORITY\SYSTEM:(ID)F
BUILTIN\Administrators:(ID)F
BUILTIN\Users:(ID)R


C:\Program Files (x86)\Crouzet Automatismes\Millenium 3>
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