Skip to content
By using Twitter’s services you agree to our Cookies Use. We and our partners operate globally and use cookies, including for analytics, personalisation, and ads.

For the best Twitter experience, please use Microsoft Edge, or install the Twitter app from Microsoft Store.

  • Home Home Home, current page.
  • About

Saved searches

  • Remove
  • In this conversation
    Verified accountProtected Tweets @
Suggested users
  • Verified accountProtected Tweets @
  • Verified accountProtected Tweets @
  • Language: English
    • Bahasa Indonesia
    • Bahasa Melayu
    • Català
    • Čeština
    • Dansk
    • Deutsch
    • English UK
    • Español
    • Filipino
    • Français
    • Hrvatski
    • Italiano
    • Magyar
    • Nederlands
    • Norsk
    • Polski
    • Português
    • Română
    • Slovenčina
    • Suomi
    • Svenska
    • Tiếng Việt
    • Türkçe
    • Ελληνικά
    • Български език
    • Русский
    • Српски
    • Українська мова
    • עִבְרִית
    • العربية
    • فارسی
    • मराठी
    • हिन्दी
    • বাংলা
    • ગુજરાતી
    • தமிழ்
    • ಕನ್ನಡ
    • ภาษาไทย
    • 한국어
    • 日本語
    • 简体中文
    • 繁體中文
  • Have an account? Log in
    Have an account?
    · Forgot password?

    New to Twitter?
    Sign up
0xDUDE's profile
Victor Gevers
Victor Gevers
Victor Gevers
@0xDUDE

Tweets

Victor Gevers

@0xDUDE

Hacker. 5,729 Responsible Disclosures / Coordinated Vulnerability Disclosures. Researcher at @GDI_FDN. Chair of @DIVDnl

In your LAN
divd.nl
Joined March 2015

Tweets

  • © 2020 Twitter
  • About
  • Help Center
  • Terms
  • Privacy policy
  • Imprint
  • Cookies
  • Ads info
Dismiss
Previous
Next

Go to a person's profile

Saved searches

  • Remove
  • In this conversation
    Verified accountProtected Tweets @
Suggested users
  • Verified accountProtected Tweets @
  • Verified accountProtected Tweets @

Promote this Tweet

Block

  • Tweet with a location

    You can add location information to your Tweets, such as your city or precise location, from the web and via third-party applications. You always have the option to delete your Tweet location history. Learn more

    Your lists

    Create a new list


    Under 100 characters, optional

    Privacy

    Copy link to Tweet

    Embed this Tweet

    Embed this Video

    Add this Tweet to your website by copying the code below. Learn more

    Add this video to your website by copying the code below. Learn more

    Hmm, there was a problem reaching the server.

    By embedding Twitter content in your website or app, you are agreeing to the Twitter Developer Agreement and Developer Policy.

    Preview

    Why you're seeing this ad

    Log in to Twitter

    · Forgot password?
    Don't have an account? Sign up »

    Sign up for Twitter

    Not on Twitter? Sign up, tune into the things you care about, and get updates as they happen.

    Sign up
    Have an account? Log in »

    Two-way (sending and receiving) short codes:

    Country Code For customers of
    United States 40404 (any)
    Canada 21212 (any)
    United Kingdom 86444 Vodafone, Orange, 3, O2
    Brazil 40404 Nextel, TIM
    Haiti 40404 Digicel, Voila
    Ireland 51210 Vodafone, O2
    India 53000 Bharti Airtel, Videocon, Reliance
    Indonesia 89887 AXIS, 3, Telkomsel, Indosat, XL Axiata
    Italy 4880804 Wind
    3424486444 Vodafone
    » See SMS short codes for other countries

    Confirmation

     

    Welcome home!

    This timeline is where you’ll spend most of your time, getting instant updates about what matters to you.

    Tweets not working for you?

    Hover over the profile pic and click the Following button to unfollow any account.

    Say a lot with a little

    When you see a Tweet you love, tap the heart — it lets the person who wrote it know you shared the love.

    Spread the word

    The fastest way to share someone else’s Tweet with your followers is with a Retweet. Tap the icon to send it instantly.

    Join the conversation

    Add your thoughts about any Tweet with a Reply. Find a topic you’re passionate about, and jump right in.

    Learn the latest

    Get instant insight into what people are talking about now.

    Get more of what you love

    Follow more accounts to get instant updates about topics you care about.

    Find what's happening

    See the latest conversations about any topic instantly.

    Never miss a Moment

    Catch up instantly on the best stories happening as they unfold.

    1. Victor Gevers‏ @0xDUDE Jan 15
      • Report Tweet

      Since December, @GDI_FDN has reported over 98 thousand vulnerable Citrix Netscalers to their organizations or their ISP and monitoring over 120 thousand servers. The Dutch Security Hotline of @DIVDnl is reporting vulnerable instances in the Netherlands. https://www.securitymeldpunt.nl/2020/01/15/How-to-check-your-Citrix-gateway/ …pic.twitter.com/BOIxMXzkbT

      2 replies 33 retweets 58 likes
      Show this thread
    2. Victor Gevers‏ @0xDUDE Jan 15
      • Report Tweet

      There are roughly 37 thousand Citrix #Shitrix devices online, which are still vulnerable (CVE-2019-19781). In the last 48 hours, we noticed a quick decline of vulnerable devices from 89 thousand to 37 thousand. Just a few more days and this mess could be cleaned up? :-)pic.twitter.com/q1cwMwYOLA

      2 replies 7 retweets 13 likes
      Show this thread
    3. Victor Gevers‏ @0xDUDE Jan 16
      • Report Tweet

      The amount of vulnerable Citrix #Shitrix endpoints is going down. Our latest scan (made from 13.95.153.127 and 137.117.226.20) detected 17,613 which are still vulnerable. Newly added (honeypot) hosts added after December are ignored.pic.twitter.com/RenUqtbQOk

      GDI Foundation and Dutch Institute for Vulnerability Disclosure
      2 replies 6 retweets 10 likes
      Show this thread
    4. Victor Gevers‏ @0xDUDE Jan 17
      • Report Tweet

      In about 5 minutes, a new scan to search for vulnerable Citrix #Shitrix endpoints will run again. So if you see 104.45.30.171 touching your Citrix server, then please don't panic. We are the good guys. Have a great weekend! :-)pic.twitter.com/SrTQ6lqI5q

      Dutch Institute for Vulnerability Disclosure and GDI Foundation
      3 replies 11 retweets 23 likes
      Show this thread
    5. Victor Gevers‏ @0xDUDE Jan 17
      • Report Tweet

      The amount of vulnerable Citrix #Shitrix endpoints went down again today. There are 16,466 vulnerable endpoints left. 1,147 endpoints are not vulnerable anymore since yesterday.pic.twitter.com/I0yfUVOUyq

      2 replies 4 retweets 17 likes
      Show this thread
    6. Victor Gevers‏ @0xDUDE Jan 18
      • Report Tweet

      Today's scan shows that 15,626 Citrix endpoints are still vulnerable.https://docs.google.com/spreadsheets/d/1Uplx-kmEUsYz9n9m0wBuZYqv6lM1TBCFa08vAwX2bJw/edit#gid=0 …

      1 reply 4 retweets 6 likes
      Show this thread
    7. Victor Gevers‏ @0xDUDE Jan 19
      • Report Tweet

      The weekend is over. Today's scan shows there are 15,602 vulnerable Citrix servers online. The amount of honeypots is steadily increasing while the amount of vulnerable servers is going down. https://docs.google.com/spreadsheets/d/1Uplx-kmEUsYz9n9m0wBuZYqv6lM1TBCFa08vAwX2bJw/edit?usp=sharing …pic.twitter.com/1eOkKUvqN1

      Dutch Institute for Vulnerability Disclosure and GDI Foundation
      3 replies 12 retweets 24 likes
      Show this thread
    8. Victor Gevers‏ @0xDUDE Jan 20
      • Report Tweet

      We are still monitoring the progress of the Citrix #CVE201919781 and the mitigation of it. 12 hours ago Citrix published updates and new fixes. Since 10:00 CET there 14,564 vulnerable endpoints online.pic.twitter.com/Yyge63UWV1

      Dutch Institute for Vulnerability Disclosure and GDI Foundation
      1 reply 10 retweets 10 likes
      Show this thread
    9. Victor Gevers‏ @0xDUDE Jan 20
      • Report Tweet

      17 hours ago, Citrix published updates & new fixes for #CVE201919781. 14,180 are still vulnerable. There are sensitive networks unpatched out there. With only a few volunteers we are trying to help (remotely) these organizations that are behind or stuck in the mitigation process.pic.twitter.com/6OkZ5wt7wS

      2 replies 9 retweets 17 likes
      Show this thread
    10. Victor Gevers‏ @0xDUDE Jan 22
      • Report Tweet

      The Dutch Security Hotline of @DIVDnl made a first analysis of the scan data collected on the night of January 9 to 10 shows that of the more than 700 vulnerable Citrix servers identified in the Netherlands, over 450 used wildcard certificates. [1/2] https://www.securitymeldpunt.nl/cases/202002-Wildcard-Certificaten-Citrix-ADC/ …

      1 reply 10 retweets 9 likes
      Show this thread
      Victor Gevers‏ @0xDUDE Jan 22
      • Report Tweet

      There is a high probability that Citrix ADC servers with no mitigation applied on or after January 9, 2020, have been taken over and their TLS certificates and associated keys have been stolen. [2/2] Please patch AND revoke your certificates.

      4:10 AM - 22 Jan 2020
      • 11 Retweets
      • 9 Likes
      • Manuel Atug * deviantsecurit1 #supportcaboverdeartfreedom Martijn Egberts Hans Meuris Will Dormann Chris van 't Hof 2501_0 😷Bhikshu2007😷 Ron Rattie
      2 replies 11 retweets 9 likes
        1. New conversation
        2. Victor Gevers‏ @0xDUDE Jan 22
          • Report Tweet

          Victor Gevers Retweeted Christopher Glyer

          Indicator of Compromise Scanner for CVE-2019-19781. Autility for detecting compromises of Citrix ADC Appliances.https://twitter.com/cglyer/status/1219984237878763521 …

          Victor Gevers added,

          Christopher Glyer @cglyer
          BREAKING - To help organizations identify compromised systems with CVE-2019-19781, @FireEye & @Citrix have released a tool that searches for indicators of compromise associated with attacker activity observed by @Mandiant https://fireeye.com/blog/products-and-services/2020/01/fireeye-and-citrix-tool-scans-for-iocs-related-to-vulnerability.html … https://github.com/fireeye/ioc-scanner-CVE-2019-19781/ …
          Show this thread
          1 reply 3 retweets 4 likes
          Show this thread
        3. Victor Gevers‏ @0xDUDE Jan 22
          • Report Tweet

          Victor Gevers Retweeted Robert

          Citrix ADC (NetScaler) Honeypot. Supports detection for CVE-2019-19781 and login attempts. Detects and logs payloads for CVE-2019-19781 (Shitrix / Citrixmash) Logs failed login attempts Serves content and headers taken from a real appliance.https://twitter.com/x1sec/status/1220239529111515136 …

          Victor Gevers added,

          Robert @x1sec
          New tool: #citrix ADC / Netscaler honeypot for cve-2019-19781 #shitrix. Serves content taken from a real system for indexing by search engines, e.g. #shodan or google. Will also detect web admin panel login attempts. https://github.com/x1sec/citrix-honeypot … pic.twitter.com/4rs9gkkoCD
          2 replies 2 retweets 6 likes
          Show this thread
        4. Victor Gevers‏ @0xDUDE Jan 23
          • Report Tweet

          🎵 11,704 Citrix servers with CVE-2019-19781 on the net, 11,704 Citrix servers with CVE-2019-19781. Patch 332 down, Mitigate it around, 11,372 Citrix servers with CVE-2019-19781 on the net... 🎵 https://docs.google.com/spreadsheets/d/1Uplx-kmEUsYz9n9m0wBuZYqv6lM1TBCFa08vAwX2bJw/edit?usp=sharing …pic.twitter.com/12L8PHOekV

          2 replies 8 retweets 15 likes
          Show this thread
        5. Victor Gevers‏ @0xDUDE Jan 24
          • Report Tweet

          CVE-2012-4606 Citrix XenServer 4.1, 6.0, 5.6 SP2, 5.6 Feature Pack 1, 5.6 Common Criteria, 5.6, 5.5, 5.0, 5.0 Update 3 contains a Local Privilege Escalation Vulnerability which could allow local users with access to a guest OS to gain elevated privileges. https://twitter.com/cvenew/status/1220477594543456257?s=21 …pic.twitter.com/ZO2wJ3Yr0I

          1 reply 6 retweets 4 likes
          Show this thread
        6. Victor Gevers‏ @0xDUDE Jan 24
          • Report Tweet

          Victor Gevers Retweeted Catalin Cimpanu

          https://twitter.com/campuscodi/status/1220711683057995777?s=21 …https://twitter.com/campuscodi/status/1220711683057995777 …

          Victor Gevers added,

          Catalin Cimpanu @campuscodi
          NEW: Hackers target unpatched Citrix servers to deploy ransomware * REvil gang attacks confirmed * Maze also suspected * Other groups are selling access to hacked Citrix systems on hacking forums https://www.zdnet.com/article/hackers-target-unpatched-citrix-servers-to-deploy-ransomware/ … pic.twitter.com/3EyWKlIRd2
          1 reply 3 retweets 3 likes
          Show this thread
        7. Victor Gevers‏ @0xDUDE Jan 24
          • Report Tweet

          Victor Gevers Retweeted Under the Breach

          https://twitter.com/underthebreach/status/1220687658701246464?s=21 …https://twitter.com/underthebreach/status/1220687658701246464 …

          Victor Gevers added,

          Under the Breach @underthebreach
          I examined the files #REvil posted from http://Gedia.com  after they refused to pay the #ransomware. the interesting thing I discovered is that they obviously hacked Gedia via the #Citrix exploit my bet is that all recent targets were accessed via this exploit. (1/2) pic.twitter.com/tWeUR7I1zj
          Show this thread
          1 reply 3 retweets 1 like
          Show this thread
        8. Victor Gevers‏ @0xDUDE Jan 24
          • Report Tweet

          https://www.bleepingcomputer.com/news/security/citrix-releases-final-patch-as-ransomware-attacks-ramp-up/ …

          1 reply 4 retweets 9 likes
          Show this thread
        9. Victor Gevers‏ @0xDUDE Jan 26
          • Report Tweet

          Victor Gevers Retweeted BleepingComputer

          "Patching the Citrix ADC Bug Doesn't Mean You Weren't Hacked" by @Ionut_Ilascuhttps://twitter.com/BleepinComputer/status/1221455792659947520?s=20 …

          Victor Gevers added,

          BleepingComputerVerified account @BleepinComputer
          Patching the Citrix ADC Bug Doesn't Mean You Weren't Hacked - by @Ionut_Ilascu https://www.bleepingcomputer.com/news/security/patching-the-citrix-adc-bug-doesnt-mean-you-werent-hacked/ …
          1 reply 2 retweets 4 likes
          Show this thread
        10. Victor Gevers‏ @0xDUDE Feb 1
          • Report Tweet

          Detecting Citrix CVE-2019-19781 via @USCERT_gov https://www.us-cert.gov/ncas/alerts/aa20-031a …

          1 reply 1 retweet 4 likes
          Show this thread
        11. Victor Gevers‏ @0xDUDE Feb 1
          • Report Tweet

          "We checked the Netscaler logs and found no evidence of successful exploitation of the vulnerability. Why are you suggesting to redeploy it with new credentials and new certificates?" This is the/etc/password file of your server. Did you not see this in your log files? RCE =☠️pic.twitter.com/yDJfhXfyLL

          0 replies 0 retweets 6 likes
          Show this thread
        12. End of conversation

      Loading seems to be taking a while.

      Twitter may be over capacity or experiencing a momentary hiccup. Try again or visit Twitter Status for more information.

        Promoted Tweet

        false

        • © 2020 Twitter
        • About
        • Help Center
        • Terms
        • Privacy policy
        • Imprint
        • Cookies
        • Ads info