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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. Alex Ionescu‏ @aionescu May 13
      • Report Tweet
      • Report NetzDG Violation

      Attackers can exploit CVE-2020-1048 with a single PowerShell command: Add-PrinterPort -Name c:\windows\system32\ualapi.dll On an unpatched system, this will install a persistent backdoor, that won't go away *even after you patch*. See https://windows-internals.com/printdemon-cve-2020-1048/ … for more details.

      32 replies 1,225 retweets 2,244 likes
      Show this thread
    2. Vess‏ @VessOnSecurity May 13
      • Report Tweet
      • Report NetzDG Violation
      Replying to @aionescu

      Hmm, are you sure that this works on Win7? None of these PowerShell verbs are recognized there: Get-Printers Get-PrinterPorts Add-PrinterPort

      2 replies 0 retweets 2 likes
    3. Mitja Kolsek‏ @mkolsek May 13
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      Replying to @VessOnSecurity @aionescu

      I was wondering the same. These seem to have been added with Windows 8. I suppose the attacker would have to use their own tool for creating the port on Windows 7.

      2 replies 1 retweet 1 like
    4. Mitja Kolsek‏ @mkolsek May 13
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      Replying to @mkolsek @VessOnSecurity @aionescu

      The vuln is in the Spooler Service and Add-PrinterPort is just a convenient way to instruct the service to create a port - I suppose . MS did patch localspl.dll on Windows 7, confirming it is exploitable there too.

      2 replies 0 retweets 4 likes
    5. Will Dormann‏ @wdormann May 15
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      Replying to @mkolsek @VessOnSecurity @aionescu

      Wait, why did Microsoft patch an "Important" / "Exploitation Less Likely" vulnerability in Windows 7? I thought Windows 7 support ended months ago.

      1 reply 0 retweets 0 likes
    6. Mitja Kolsek‏ @mkolsek May 15
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      Replying to @wdormann @VessOnSecurity @aionescu

      Extended Security Updated remain available for 3 more years.

      1 reply 0 retweets 0 likes
    7. Mitja Kolsek‏ @mkolsek May 15
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      Replying to @mkolsek @wdormann and

      *Updates

      1 reply 0 retweets 0 likes
    8. Will Dormann‏ @wdormann May 15
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      Replying to @mkolsek @VessOnSecurity @aionescu

      Got it. So they patched Windows 7, but the patch isn't available for free.

      1 reply 0 retweets 0 likes
    9. Mitja Kolsek‏ @mkolsek May 15
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      Replying to @wdormann @VessOnSecurity @aionescu

      Precisely.

      1 reply 0 retweets 0 likes
      Will Dormann‏ @wdormann May 15
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      Replying to @mkolsek @VessOnSecurity @aionescu

      Though perhaps to be more specific here, the updates are still published and freely downloadable: https://www.catalog.update.microsoft.com/Search.aspx?q=KB4556836 … are the May 2020 Monthly Quality Rollups for Windows 7. They just seem to be not installable on a stock Win7 system. Perhaps paying gets you that ability?

      10:18 AM - 15 May 2020
      1 reply 0 retweets 0 likes
        1. New conversation
        2. Mitja Kolsek‏ @mkolsek May 15
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          Replying to @wdormann @VessOnSecurity @aionescu

          Exactly. You can download them at will but you can only install them if you have the proper (purchased) key in place. (Though I heard 0patch provides all high-risk patches for the same 3 years, plus many 0day patches - I believe they're preparing a patch for this one too ;) )

          1 reply 0 retweets 1 like
        3. Mitja Kolsek‏ @mkolsek May 20
          • Report Tweet
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          Replying to @mkolsek @wdormann and

          Mitja Kolsek Retweeted 0patch

          Turns out my sources were right:https://twitter.com/0patch/status/1263099610580598789 …

          Mitja Kolsek added,

          0patch @0patch
          Windows 7 and Server 2008 R2 users without Extended Security Updates have just received a micropatch for CVE-2020-1048, a privilege elevation vulnerability allowing a local non-admin attacker to create an arbitrary file in an arbitrary location. pic.twitter.com/OszjM6G6Le
          Show this thread
          0 replies 0 retweets 2 likes
        4. End of conversation

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