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How Attackers Could Use Azure Apps to Sneak into Microsoft 365
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tdsan
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tdsan,
User Rank: Ninja
3/26/2020 | 1:21:08 PM
Interesting article, but there are somethings that are not discussed
This is the only clue that might indicate foul play, Saraga notes, but many people are likely to click "accept" without thinking twice about it. From there, a victim won't know someone unauthorized is there unless the intruder modifies or creates objects that are visible to the user, he explains.

For one, if the user selects accept, there is MFA that has to be checked but there is a thing in Azure called Azure Sentinel, it is relatively inexpensive and provides insight as to vulnerabilities and issues found. In addition, our proxy, firewall and NAC blocks access to this access because the system has identified it as not coming from Microsoft or from our internal site (verified). In addition, the only way someone has admin access is an administrator or su (super user) and the SUs are not clicking on links where they can easily see (hover over the link indicates it came from).

So yes, once the person is inside, things can be done to affect all of the applications but there are a number of layers they have to get through first that alleviates this access because the user who clicked on the link won't have admin access to App, Email services.

T
djbavedery
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djbavedery,
User Rank: Apprentice
3/26/2020 | 1:53:31 PM
Isn't this a bit unnecessary?
Why go through the trouble of creating an Azure App once someone already entered there credentials? You already have the credentials and therefore access to their O365 tenant, or does this skirt around MFA?
tdsan
50%
50%
tdsan,
User Rank: Ninja
3/28/2020 | 7:31:59 PM
Re: Isn't this a bit unnecessary?
I agree with you there, if the user has access to user credentials, I think they have more problems to address because there is:
  • MFA/2FA
  • SAML 2.0 (Single Sign-On)
  • Active Directory Integration
  • System Manager (AWS)
  • Sentinel (Azure)
  • SG/NSG (Security Groups/Network Security Groups)
  • VPN/VPC

Todd


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