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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 Jan 10
      • Report Tweet
      • Report NetzDG Violation

      The cat's pretty much out of the bag on how to exploit this. Expect widespread exploitation attempts for CVE-2019-19781 at this point. Despite being almost a month old, there is NO PATCH from @citrix at this point. Only a (very important) mitigation. https://www.kb.cert.org/vuls/id/619785/  https://twitter.com/HackingDave/status/1215684853724741634 …pic.twitter.com/mYyokzy2pq

      3 replies 34 retweets 58 likes
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      Will Dormann‏ @wdormann Jan 10
      • Report Tweet
      • Report NetzDG Violation

      You don't need to run a working exploit to know if a system is vulnerable or not, though. Simply visit: CITRIXGATEWAY/vpns/cfg/smb.conf in your web browser or script or whatever. If you get a file, the system is vulnerable. If you get a 403, it has had mitigations applied.

      9:52 AM - 10 Jan 2020
      • 8 Retweets
      • 18 Likes
      • Cloudy Aperture @ 🏚 Thorsten E. Royce Williams Binary !mpact ps66uk Mahendar Maha Jetski Tony Kamloops Ryan Lonergan
      3 replies 8 retweets 18 likes
        1. New conversation
        2. Will Dormann‏ @wdormann Jan 10
          • Report Tweet
          • Report NetzDG Violation

          Also, FreeBSD 8.4 was EOL'd years ago. And even FreeBSD v. current doesn't even have ASLR enabled (not that it'd matter in this particular case). And this is something you're exposing directly to the Internet? YOLO!

          3 replies 4 retweets 17 likes
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        3. Will Dormann‏ @wdormann Jan 16
          • Report Tweet
          • Report NetzDG Violation

          Note that Citrix has updated https://support.citrix.com/article/CTX267027 … since its initial release. Two notable changes: 1) Citrix SD-WAN WANOP has been added to affected products. 2) Citrix ADC Release 12.1 builds before 51.16/51.19 and 50.31 have bugs that make the mitigations not work. Whoops!

          2 replies 24 retweets 30 likes
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        4. Will Dormann‏ @wdormann Jan 16
          • Report Tweet
          • Report NetzDG Violation

          And just for the record, /vpn/../vpns/cfg/smb.conf is the more universal form of the URI to test the vulnerability. The directory traversal is required for IPs listening for the VPN Virtual server. e.g. curl https:// CITRIXGATEWAY /vpn/../vpns/cfg/smb.conf --path-as-is -k

          2 replies 1 retweet 7 likes
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        5. Will Dormann‏ @wdormann Jan 20
          • Report Tweet
          • Report NetzDG Violation

          Note that Citrix is rolling out changes to address CVE-2019-19781 for some versions at https://support.citrix.com/article/CTX267027 … Unauthenticated users no longer appear to be able to request the pages in question.pic.twitter.com/kh2oJlOd10

          0 replies 2 retweets 3 likes
          Show this thread
        6. End of conversation
        1. New conversation
        2. neonprimetime‏ @neonprimetime Jan 10
          • Report Tweet
          • Report NetzDG Violation
          Replying to @wdormann @citrix

          Is the mitigation only for unauthenticated traffic? Curious if there is still RCE with authenticated user? The reason I ask ... I could not get to smb.conf unauth but as soon as I authed them smb.conf is accessible in browser. Thx

          1 reply 0 retweets 0 likes
        3. Will Dormann‏ @wdormann Jan 10
          • Report Tweet
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          Replying to @neonprimetime @citrix

          For folks accessing the virtual IP of a vulnerable system, you might need to use CITRIXGATEWAY/vpn/../vpns/cfg/smb.conf to test. The mitigation should work in both cases.

          0 replies 1 retweet 1 like
        4. End of conversation
        1. New conversation
        2. Clément Notin‏ @cnotin Jan 10
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          • Report NetzDG Violation
          Replying to @wdormann @citrix

          Isn't there an important part of the URL missing? 😉

          1 reply 0 retweets 1 like
        3. Ug_0 Security‏ @Ug_0Security Jan 10
          • Report Tweet
          • Report NetzDG Violation
          Replying to @cnotin @wdormann @citrix

          if you go CITRIXGATEWAY/vpns/cfg/smb.conf you get nothing but a redirection ;)

          1 reply 0 retweets 0 likes
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