Category Archives: Enterprise Security

Choosing the right Azure MFA authentication methods

A couple of weeks ago, I took interest in Azure Multi-factor Authentication (MFA) and wrote a series on 4Sysops, detailing the Azure MFA Service and the on-premises Multi-Factor Authentication Server: Azure Multi-Factor Authentication – Part 1: Introduction Azure Multi-Factor Authentication – Part 2: Components Azure Multi-Factor Authentication – Part 3: Configuring Azure Multi-Factor Authentication – […]


Security Thoughts: Microsoft Local Administrator Password Solution (LAPS, KB3062591)

As you might recall, Microsoft offered a solution to systems administrators to set the local administrator password on domain-joined devices using Group Policy Preferences, but ended the solution, almost a year ago, when the encoding mechanism was decoded and an attack was created towards this vulnerability (CVE-2014-1812).   Introducing LAPS Yesterday, Microsoft introduced version 6 […]


Security Thoughts: Vulnerability in NETLOGON cloud allow spoofing (MS15-027, CVE-2015-0005)

While this has proven to be n interesting month with the Factoring RSA Export Keys (FREAK) technique affecting a plethora of Operating Systems, Microsoft has also issued an update to address a privately reported vulnerability in NETLOGON.   About the vulnerability A spoofing vulnerability exists in NETLOGON that is caused when the NETLOGON service improperly […]


Security Thoughts: Vulnerability in SChannel allows security bypassing (Important, FREAK, MS15-031, CVE-2015-1637)

In recent days, a new attack vector, called the FREAK technique, that facilitates SSL/TLS Man-in-the-Middle (MitM) attacks was in the news. Microsoft has confirmed that its implementations of SChannel in Windows and Windows Server are also vulnerable to this attack method and has released updates for all its supported Operating Systems.   About FREAK On […]


Security Thoughts: Include command line in process creation events

Windows 8.1 and Windows Server 2012 R2 introduced an awesome new feature, called Include command line in process creation events, a Group Policy setting that expands the Audit Process Creation policy so events in Event Viewer (eventvwr.msc) include the actual commands issued. Last week, Microsoft introduced an update to Windows 7, Windows 8, Windows Server […]


Vulnerabilities in Group Policy could allow security policy bypassing (MS15-011, MS15-014, CVE-2015-0008, CVE-2015-0009)

For its February 2015 Patch Tuesday on Tuesday February 10, Microsoft has released two security bulletin to address issues in Group Policy that would allow an attacker using a Man-in-the-middle (MitM) approach to bypass security policies, by forging packets sent by Domain Controllers.   The situation In many organizations, Group Policies are used to centrally […]


Granularly permitting or denying the right to WorkPlace Join devices based on group membership

Previously, we’ve looked at the WorkPlace Join functionality in Active Directory Federation Services (AD FS) in Windows Server 2012 R2 (and up) and the accompanying Registered Device objects in Active Directory Domain Services (AD DS). When WorkPlace Join is enabled for a networking environment, by default anyone has the right to WorkPlace Join devices, by […]


Security Thoughts: Leveraging NTLM Hashes using Kerberos RC4-HMAC encryption (AKA Aorato’s Active Directory Vulnerability)

In a blogpost today, Tal Be'ery, Vice President Research at Aorato, an Israeli security company consisting of veterans of the Israeli Defense Forces specializing in Active Directory, published how weak encryption enables an attacker to change a victim’s password without being logged. Labeled as a vulnerability in Active Directory, this information sparked some controversy, so […]


I’ll be speaking at the Datacenter Group’s Partner Event

Working at a Systems Integrator (SI) has its perks. I get to discuss interesting technologies with interesting customers and interesting partners. Sometimes, my playing field feels like an ecosystem where manufacturers, partners and customers think and act like one. One of the partners we’re working closely these days and gives me that special feeling is […]


I’ll be speaking at Ngi-NGNs ‘Systems Management: Beyond Control’ event

I’ve been associated with the Dutch Networking User Group (NGN) for almost five years now. I’ve been speaking at their events and have helped others achieve the same goal. NGN has recently joined forces with the Dutch Platform for IT Professionals (Ngi), and an old tradition has been dusted off: We’re organizing a Windows Server-themed […]