This can be harmful from but can a possible attempt to sabotage a competitor to reply on time to a last minute RFC. (and gets locked again by an active DDoS). a locked user is a person that cannot work until support unlock him.Not big security issue? Well let’s think: You can try to login on Skype for Business with different credentialsĪ successful ‘DDoS’ will lock that user AD account (for some minutes or forever depending on the AD policy). What are the chances that the UPN is the same as the SIP and Email address? Knowing the domain and the samaccountname might be more tricky, but it’s possible.Īs soon as someone knows a valid SIP address I can use a SfB client (windows of for mobile) and can now try to login with credentials 5 or more times. How difficult is that? In 90% of the case it matches his email address. Let’s start with the first topic: Part 1 – Denial of Services and exploits 1.1. the challenges might be related to external user connectivity, they can be replicated using just inside your corporate LAN.I use an On-premises SfB as the example, you will see very similar challenges using Office 365, in either Skype for Business Online or Microsoft Teams.
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Initially I will expose the challenges and after them, I will describe how to mitigate them. Since there is quite a significant amount of content to cover, I divided this topic into smaller post. I would prefer not to call them ‘security risks’ at this time, BUT… ignoring them after reading and knowing them, it would change subject title! Once you enable all these abilities to your users, you also create new security challenges to your company.
SfB is about enabling collaboration between people: any device, anytime and anywhere. Then you configure several policies to allow remote user access (PC, mobiles clients, ), federation with other SfB domains and conferences. These last two are, hopefully, isolated by firewalls. Either it’s a simple or more complex (HA, PSTN connectivity,…) it contains 3 components: a Front-end on an Active Directory and an Edge and a Reverse Proxy. So…! You have roll-out Skype for Busines (SfB) on you company.
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