Azure's Weakest Link – Five Full Cross-Tenant Compromises

(binarysecurity.no)

241 points | by swq115 11 hours ago

11 comments

  • unddoch 5 hours ago
    If anyone from Microsoft security reads this, could you please do something about login.microsoftonline.com/XXX/v2.0/adminconsent?

    The callback you're redirecting the user to at the end of that flow is forgeable if an attacker knows an azure tenant ID of a different customer, and putting a "Never use the tenant ID value of the tenant parameter to authenticate or authorize users" warning in the docs is only helpful as long as a way to authenticate users exists.

    • birdsongs 4 hours ago
      They'll see it, tell a manager, it'll get added as a ticket to an Azure Devops board under the initiative for this month under the epic for employee suggestions, which will be reviewed & prioritised by Copilot and sent to a different middle manager as a weekly summary email and then automatically closed when no human ever interacts with the ticket after three months.
      • rsalus 4 hours ago
        speaking as a FTE at Microsoft... yup
        • 0xWTF 4 hours ago
          Glad to know the frozen middle exists among the hyperscalers. High confidence you can swap the entire leadership team and nothing will change.
          • jiggawatts 31 minutes ago
            > frozen middle

            That’s the best new term I’ve learned in months!

        • Henchman21 3 hours ago
          I spent 6 months working as a contractor in MS’ Chicagoland data centers. Nothing worked — phones on the walls ran Windows and did not give dial tone. Security systems unable to function because of Windows updates. Personnel more concerned with their required LinkedIn updates than their jobs. Not one FTE liked their role — everyone had a foot out the door.

          When they offered to make me FTE I declined and moved on. Because it was an obvious absolute shit-show.

          Sorry for those that are currently employed by MS.

    • nikanj 12 minutes ago
      I love that this is the most reliable way to actually contact an actual human working at Microsoft
  • meekins 8 hours ago
    When it comes to the amount of cross-tenant leaks Azure looks to be way ahead the competition. Makes me wonder why enterprises still flock there.
    • traceroute66 7 hours ago
      > Makes me wonder why enterprises still flock there

      Well, when you're already paying Microsoft $/user/month for Intune, Teams&co. you might as well use Azure too.

      Only one vendor relationship to manage, and I suspect you probably have to spend far less money than you do with AWS to get some personal attention.

      • waz0wski 5 hours ago
        > one vendor relationship to manage

        Anyone that's had to deal with Microsoft will tell you this means nothing

        If you can even get attention from someone, you'll be bounced between teams and people who barely know the products they are "supporting"

        Don't get me started on the Azure and O365 management portals

        The only worse support experience I've had was with Oracle where it could take days just to get the boilerplate "send us your logs" response on a Sev1 issue, despite the logs already being provided in the initial ticket

        In both cases, this is while at F100 companies with millions of dollars of licensed software and premium support contracts

        • marcosdumay 2 hours ago
          Managing a vendor relationship is the act of distributing license usage through your people, reviewing contracts, having somebody that knows when and where you have to send money so that the software keeps working, and making sure you are not doing something against the contract.

          With Microsoft that takes several people working full time. Corporations tend to not want more of those relationships to manage.

        • rsalus 4 hours ago
          I'm convinced all engineers in the O365 org are call center techs in disguise
        • esikich 4 hours ago
          What do you mean "even get attention from someone"? Enterprise contracts have support included. You can get an engineer on the phone within 24 hours. As long as you are competent enough to answer their questions, their support has been fairly good in my experience.
          • jiggawatts 28 minutes ago
            The initial support tech is typically outsourced and responds with: “Yes, it is broken… by design.”

            Attention means an engineer who can fix the problem, not an off shore phone jockey paid to make you quietly go away.

        • traceroute66 5 hours ago
          > Anyone that's had to deal with Microsoft will tell you this means nothing...

          In relation to everything you said in your post, let's just say "trust me, I know".

          But you missed the point I was making.

          The GP said "Makes me wonder why enterprises still flock there".

          And anyone who's had to deal with enterprise procurement knows if you've got a vendor on the list then its easier to deal with that one than push for multiple.

          And then there's the whole budgeting thing. If management can see you're already buying every single employee in the org a Teams license, then getting extra budget for some Azure toys will probably be an easier sell then "yeah, I know we're paying Microsoft a lot of money, but can we have some AWS too". Since in their eyes Azure and Teams licenses is the same thing, "money for Microsoft".

          Sadly the tech desk experience in enterprises tends to fall low down the list, if it is considered at all.

          Sure, in theory, if you've got a good CTO to fight your corner then YMMV, but not everyone does.

      • jeffrallen 6 hours ago
        Must be convenient to get all your security bugs from one vendor...
    • xmcp123 8 hours ago
      Same reason as it was in 2002. “No one ever got fired for buying Microsoft.”
      • Betelbuddy 7 hours ago
        Lets get our Cloud...from the same guys who have been unable to provide a freeze screen feature in Teams for 10 years..should be a firing offense...
        • adamm255 1 minute ago
          When I have to present in Teams I realise how much I lean on that feature in Zoom. Absolutely astonishing that it’s not a feature.
        • totallykvothe 7 hours ago
          Wdym? Teams freezes my screen all the time!
      • ok123456 2 hours ago
        In 2026, it's also: "They have FedRAMP, and some "cyber" person told me we need GCC-High to pass an audit."
        • jon128 2 hours ago

            Federal Cyber Experts Thought Microsoft’s Cloud Was “a Pile of Shit.” They Approved It Anyway.
          
            https://www.propublica.org/article/microsoft-cloud-fedramp-cybersecurity-government
      • sandeepkd 5 hours ago
        It pretty much applies to everything, going along the tide is always easier
      • winrid 2 hours ago
        Good time to start.
    • giancarlostoro 1 hour ago
      I do .NET full time, every shop I've worked at was on Azure. It makes the most sense for .NET developers, but I'd personally prefer to just rent dedicated servers at this point.
    • magicalhippo 6 hours ago
      For us a big part is that they have data centers in our country. It makes for improved latency and also makes a lot of our customers sleep better (justifiably so or not).

      Amazon doesn't and regardless nobody feels comfortable using Google, who knows when they'll discontinue a product we would rely on.

      So not a lot left to choose from.

    • toomuchtodo 6 hours ago
      Their sales folks are very good with C level folks, from the meetings I've sat in on. They will give you substantial credits and hands on support to build for you, depending on vertical and predicted future spend, especially if you're already at another cloud provider they're trying to pull you from.
      • Betelbuddy 6 hours ago
        AI Agents are salivating at that level of incompetence....
        • toomuchtodo 6 hours ago
          If there is no cost for poor decisions, nothing will be learned. Incentives drive outcomes.
    • jon128 6 hours ago
      Feels. AKA stupidity, ultimately.
  • giovanni_or2 5 hours ago
    This guy must be the nightmare of Azure developers, kudos for the incredible work on finding these vulnerabilities!
    • josteink 26 minutes ago
      We contract this company at work. They’re clearly capable.

      Can confirm that we’re getting our money's worth. :D

  • albert_e 8 hours ago
    maybe we should tag submissions with dates now?

    [2026-10-02]

    beginning of curent month feels like two years ago when multiple vulns drop daily

  • thewisenerd 8 hours ago
    path traversal and IDOR..

    likely been active since the inception of these capabilities

    wonder if the recommendation to "add randomness to resource names" is because of this (unrelated security by obscurity lol)

    • chinathrow 8 hours ago
      Gotta put these backdoors somewhere.
  • outworlder 5 hours ago
    Ok so.

    Microsoft had an egregious cross-tenant vulnerability (really, how many cross-tenant vulnerabilities did other clouds have?).

    Vulnerability was reported.

    They fixed it - incorrectly. Reported again.

    They fixed it this time... and broke the previous fix. So it's vulnerable again.

    What a clown show.

  • mapotofu 5 hours ago
    “Go to the cloud!”, they said.

    The cloud:

    Let’s see how their platform design holds up in the coming years, and if it can hold up to LLMs doing more of this same type of discovery and whether MSFT can fix it.

  • xmcp123 8 hours ago
    God. I would hate to be the engineer forced to have enough Azure experience to be able to find these bugs and understand Azure’s infrastructure on this level.

    Should have been addressed in the Geneva conventions.

    • anonymous908213 16 minutes ago
      The outsourcing of coding to LLMs is, in this case, a humanitarian measure.
  • eugenekay 8 hours ago
    Reporting cross-Tenant issues as an outsider with a vulnerability chain gets you $$$.

    Reporting “theoretical” issues with validation as an Employee gets you a lot of questions as to why you were looking.

    Oh well.

    • outworlder 6 hours ago
      So MSFT discourages employees from reporting vulnerabilities?

      That explains a lot.

    • traceroute66 7 hours ago
      > Reporting “theoretical” issues with validation as an Employee

      Microsoft still has employees ? ;)

      (Sorry. Low bar. But in all honesty I thought they outsourced the majority of ops. I was surprised to hear in recent news that they actually had that many employees left)

  • gary23w 5 hours ago
    [flagged]
  • klorbrinnbor 7 hours ago
    [flagged]