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wdormann's profile
Will Dormann
Will Dormann
Will Dormann
@wdormann

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Will Dormann

@wdormann

Vulnerability Analyst at the CERT/CC. My thoughts are my own, not my employer's.

Joined August 2012

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    1. Will Dormann‏ @wdormann 5 Feb 2019
      • Report Tweet
      • Report NetzDG Violation

      Despite Exchange 2010 not being affected by the #privexchange PoC in my testing, Microsoft has listed Exchange 2010 in their new advisory: https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/ADV190007 … Perhaps they know of a variant that affects 2010. Still no update at this time, so be sure to apply workarounds!

      2 replies 3 retweets 5 likes
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    2. Will Dormann‏ @wdormann 5 Feb 2019
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      • Report NetzDG Violation

      But then again, this advisory states "To exploit the vulnerability, an attacker would need to execute a man-in-the-middle attack", which we know isn't true. So maybe I'll let the dust settle a bit...

      1 reply 0 retweets 2 likes
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      Will Dormann‏ @wdormann 5 Feb 2019
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      It also states "An attacker who successfully exploited this vulnerability could attempt to impersonate any other user of the Exchange server." This is worded in a way that implies that perhaps the impact is that User A can read the email of User B. It can get you DOMAIN ADMIN!

      9:31 PM - 5 Feb 2019
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      • Tholgrim Dirk-jan Mitja Kolsek
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        2. Will Dormann‏ @wdormann 6 Feb 2019
          • Report Tweet
          • Report NetzDG Violation

          And you might ask yourself: How did @msftsecresponse advisory https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/ADV190007 … get published without mentioning CVE-2019-0686? Story time: At some point, MSRC stopped using bulletin identifiers like MS08-067, and started using CVE IDs instead. This is a good thing, right?

          1 reply 1 retweet 1 like
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        3. Will Dormann‏ @wdormann 6 Feb 2019
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          Not so fast... When this change happened, MSRC adopted the incorrect mindset that a CVE ID is used to refer to a software update, rather than a vulnerability. Because no software update has been released for Exchange, Microsoft has not yet publicly referred to it by its CVE ID.

          0 replies 0 retweets 6 likes
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        4. End of conversation
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        2. Brian in Pittsburgh‏ @arekfurt 5 Feb 2019
          • Report Tweet
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          Replying to @wdormann

          I guess MS's reasoning is "Attackers cannot compromise a Domain Admin account if an OnPrem deployment follows Microsoft’s security best practice guidance and has implemented Active Directory Split Permissions." Such as it is. Although that's for 2013+ So what about 2010?

          1 reply 0 retweets 2 likes
        3. Will Dormann‏ @wdormann 5 Feb 2019
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          Replying to @arekfurt

          Attackers can compromise the Domain Admin account if a user installs Exchange with the DEFAULT SETTINGS. To say that people will be fine if they lock things down using non-default configurations is a bit of a stretch.

          1 reply 0 retweets 4 likes
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