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Microsoft Azure proofs #35

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PatrikHudak opened this issue Sep 12, 2018 · 13 comments
Closed

Microsoft Azure proofs #35

PatrikHudak opened this issue Sep 12, 2018 · 13 comments
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@PatrikHudak
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@PatrikHudak PatrikHudak commented Sep 12, 2018

Service name

Microsoft Azure

Proof

There is no general approach for PoC. Microsoft Azure offers multiple services (CloudApp, Azure Websites, etc.) that use different domain names.

General approach in verifying subdomain takeover is to check, whether the Azure domain responds with NXDOMAIN DNS status. This is (to my knowledge) the necessary condition of the domain, however it is not sufficient. In other words, not all Azure domains which are used in some CNAME and respond with NXDOMAIN are vulnerable to subdomain takeover. I personally got a case where Azure portal refused to create a domain even though it responded with NXDOMAIN.

Some H1 reports to prove this point:

As mentioned before, the PoC creation depends on the service in question, however, they generally tend to have similar workflows.

Documentation

These are the domains that are identified as vulnerable. Each of these is used for particular Azure service:

  • *.cloudapp.net
  • *.cloudapp.azure.com
  • *.azurewebsites.net
  • *.blob.core.windows.net
  • *.cloudapp.azure.com
  • *.azure-api.net
  • *.azurehdinsight.net
  • *.azureedge.net
  • *.azurecontainer.io
  • *.database.windows.net
  • *.azuredatalakestore.net
  • *.search.windows.net
  • *.azurecr.io
  • *.redis.cache.windows.net
  • *.azurehdinsight.net
  • *.servicebus.windows.net
  • *.visualstudio.com
@Sechunt3r

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@Sechunt3r Sechunt3r commented Sep 28, 2018

Hi All,
Hope you are good!

if a Azure Domain not Respond with NXDOMAIN that means it is not Vulnerable.
But if it shows this ;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR,

Then what would be the answer is it vulnerable or not!

Hope you understand my points

Regards
Shivam

@codingo

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@codingo codingo commented Oct 21, 2018

Linked back on the main repository, closing this as @Sechunt3r's comment is already addressed in @PatrikHudak's summary.

@codingo codingo closed this Oct 21, 2018
@ghsec

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@ghsec ghsec commented Feb 27, 2019

if subdomain return public IP is possible subdomain takeover?

@sumgr0

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@sumgr0 sumgr0 commented Mar 3, 2019

If the sub-domain points to traffic manager service for Azure, is the takeover possible? When attempting to create a traffic manager profile using the same name as in the CNAME, getting error which mentions "Domain name xyz.trafficmanager.net already exists. Please choose a different DNS prefix".

Has Microsoft patched the service or am I doing something wrong?

Thanks

@PatrikHudak

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@PatrikHudak PatrikHudak commented Mar 3, 2019

@sumgro Microsoft haven't patched the service and you are doing everything ok.

You are getting a error message because the Traffic Manager profile actually EXIST, so you are unable to claim it. When you make a DNS request to *.trafficmanager.net and get NXDOMAIN there are two possible outcomes:

  1. The Traffic Manager with requested name really don't exist - you can go ahead and register it. In this context it is likely that the Subdomain Takeover is possible.
  2. (From my own testing) Traffic Manager profile can be created, however there is no requirement to assign it any endpoints by default. Traffic Manager (as the name) implies is trying to distribute network traffic using different settings and acts just as a middleman. This means that in order it to work, you need to set up endpoints (a.k.a. FQDN) where the traffic will be forwarded once the user reaches to something.trafficmanager.net. Now to the core of the problem: When there is no endpoint assigned in the profile, you will get the same NXDOMAIN response as you would get with non-existing TM profile. In this case, you won't be able to take in over because the TM profile with the name in CNAME record actually exist, it just seems that the profile does not exist.

It is pretty easy to setup a automation for that using Azure API. You would need to test a creation of particular TM profile and not rely only on DNS request as some external indicator of TM profile existence.

Hope it helps.

@sumgr0

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@sumgr0 sumgr0 commented Mar 3, 2019

Thank you for the revert @PatrikHudak, really appreciate the detailed reply.

I'm fairly new to the subdomain takeover subject. When testing for the subdomain in question, the dig <subdomain.domain.com> confirmed the error NXDOMAIN (thereby bringing a smile) and then the CNAME pointed to xyz.trafficmanager.net.

From your reply, I understand that the profile already exists with the same name as the CNAME, even when the end-point may not have been setup, this results in the error message both when visiting the link and through the dig command. Hence, the takeover for in this situation may not be successful.

Not able to get the pointers on the Azure API for automation, kindly point in the direction to be able to research more on the topic to get an understand for future hunting.

Thanks

@sumgr0

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@sumgr0 sumgr0 commented Mar 21, 2019

I've come across a sub-domain, pointing to an azure web app service. This CNAME itself has 3 levels like xyz.abc.m.azurewebsites.net. It shows the NXDOMAIN error when checking with dig.

However, when I try to create the App on the Azure Portal as xyz.abc.m to takeover, it does not allow periods in the same. Anyone aware of how can such scenario be handled for sub-domain takeover?

Thanks

@nikokosm

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@nikokosm nikokosm commented Mar 28, 2019

I also faced this. I found a subdomain that resolved to xyz.easteurope.cloudapp.azure.com and could not use the . character. Anyone else got around this?

Edit: turns out you could take over this by registering an Azure VM in the easteurope region ;)

@sumgr0

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@sumgr0 sumgr0 commented Mar 28, 2019

found this in relation to the above, but haven't been able to go through in details to understand:
https://docs.microsoft.com/en-us/azure/app-service/environment/using-an-ase

@AdmiralGaust

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@AdmiralGaust AdmiralGaust commented Sep 1, 2019

I found a subdomain pointing to 104.211.97.138. The ip certificate is issued to *.azurewebsites.net and the subdomain does not contain txt record.

Is it vulnerable to subdomain takeover?

@codingo codingo mentioned this issue Sep 5, 2019
@lamosuthakar

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@lamosuthakar lamosuthakar commented Dec 17, 2019

graph TD;
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@marcelo321 marcelo321 commented Dec 26, 2019

I think it is a Edge case too.

;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 2616
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 1

"Domain name redacted.trafficmanager.net already exists. Please choose a different DNS prefix."

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@marcelo321 marcelo321 commented Dec 27, 2019

Can anyone confirm if this isn't possible or im just stupid?

when tryin to claim a CNAME with multiple levels like abc.aaa.azurewebsite.net i get

. is an invalid character

this means it is only possible to claim 1 level subdomains like abc.azurewebsite.net?

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