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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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    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

    9:37 AM - 10 Jan 2020
    • 34 Retweets
    • 58 Likes
    • Cloudy Aperture @ 🏚 olymppa Carlos Borges Art Manion bryan owen Ai Rafał Fitt Val Bercovici is working on the safety of WFH CrossComplianceCom
    3 replies 34 retweets 58 likes
      1. New conversation
      2. 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.

        3 replies 8 retweets 18 likes
        Show this thread
      3. 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
        Show this thread
      4. 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
        Show this thread
      5. 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
        Show this thread
      6. 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
      7. End of conversation
      1. Thierry Zoller  🌐‏ @thierryzoller Jan 10
        • Report Tweet
        • Report NetzDG Violation
        Replying to @wdormann @citrix

        This is near 100% identical of the dir traversal i reported 2011. citrix classified it as ‚information disclosure‘. Daemon ran as root

        0 replies 2 retweets 3 likes
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      1. New conversation
      2. PaulInNapaValley‏ @PaulNapaValley Jan 16
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        Replying to @wdormann @citrix

        @threadreaderapp unroll this pls.

        1 reply 0 retweets 0 likes
      3. Thread Reader App‏ @threadreaderapp Jan 16
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        • Report NetzDG Violation
        Replying to @PaulNapaValley

        Namaste, there is your unroll: Thread by @wdormann: The cat's pretty much out of the bag on how to exploit this. Expect widespread exploitation… https://threadreaderapp.com/thread/1215689019486543874.html …. Share this if you think it's interesting. 🤖

        0 replies 0 retweets 0 likes
      4. End of conversation

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