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CIRCLE WITH A DOT

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  3. [related]chez AlmaLinux

[related]chez AlmaLinux

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  • decio@infosec.exchangeD decio@infosec.exchange

    🤪 🔥
    et c'est reparti pour un tour : #fragnesia le petit frère de DirtyFrag (même famille ESP/XFRM, même mitigation rmmod esp4 esp6 rxrpc, même page cache qui se fait défoncer, just trust me bro).

    Bonne nouvelle : si t'avais blocklisté les modules « au cas où », t'es OK.

    Mauvaise nouvelle : si t'as "juste" patché DirtyFrag , il te faut le patch Fragnesia aussi.

    "Fragnesia is a universal Linux local privilege escalation exploit, discovered by William Bowling with the V12 team. Fragnesia is a member of the Dirty Frag vulnerability class. "
    👇
    https://github.com/v12-security/pocs/tree/main/fragnesia

    #CyberVeille #linux
    🐧🔥

    decio@infosec.exchangeD This user is from outside of this forum
    decio@infosec.exchangeD This user is from outside of this forum
    decio@infosec.exchange
    wrote last edited by
    #6

    #Fragnesia #Linux #Kernel
    "All versions affected by dirtyfrag are affected."
    "Any versions without this patch: https://lists.openwall.net/netdev/2026/05/13/79 , so any Linux kernel before May 13 2026."

    bortzmeyer@mastodon.gougere.frB decio@infosec.exchangeD 2 Replies Last reply
    0
    • decio@infosec.exchangeD decio@infosec.exchange

      #Fragnesia #Linux #Kernel
      "All versions affected by dirtyfrag are affected."
      "Any versions without this patch: https://lists.openwall.net/netdev/2026/05/13/79 , so any Linux kernel before May 13 2026."

      bortzmeyer@mastodon.gougere.frB This user is from outside of this forum
      bortzmeyer@mastodon.gougere.frB This user is from outside of this forum
      bortzmeyer@mastodon.gougere.fr
      wrote last edited by
      #7

      @decio I was not successful with the POC, even with modules allowed.

      decio@infosec.exchangeD 1 Reply Last reply
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      • decio@infosec.exchangeD decio@infosec.exchange

        #Fragnesia #Linux #Kernel
        "All versions affected by dirtyfrag are affected."
        "Any versions without this patch: https://lists.openwall.net/netdev/2026/05/13/79 , so any Linux kernel before May 13 2026."

        decio@infosec.exchangeD This user is from outside of this forum
        decio@infosec.exchangeD This user is from outside of this forum
        decio@infosec.exchange
        wrote last edited by
        #8

        [related]

        "Fragnesia: Linux Kernel Local Privilege Escalation via ESP-in-TCP"
        👇
        https://www.wiz.io/blog/fragnesia-linux-kernel-local-privilege-escalation-via-esp-in-tcp

        #Fragnesia #linux

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        • bortzmeyer@mastodon.gougere.frB bortzmeyer@mastodon.gougere.fr

          @decio I was not successful with the POC, even with modules allowed.

          decio@infosec.exchangeD This user is from outside of this forum
          decio@infosec.exchangeD This user is from outside of this forum
          decio@infosec.exchange
          wrote last edited by
          #9

          @bortzmeyer Intéressant, tu peux me dire sur quelle distro/version ?
          Je n'ai pas encore eu le temps de le tester sur mes conteneurs & Debian/Kali, mais d'après le README pour Ubuntu: AppArmor restricts unprivileged user namespaces by default.

          bortzmeyer@mastodon.gougere.frB 3 Replies Last reply
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          • decio@infosec.exchangeD decio@infosec.exchange

            @bortzmeyer Intéressant, tu peux me dire sur quelle distro/version ?
            Je n'ai pas encore eu le temps de le tester sur mes conteneurs & Debian/Kali, mais d'après le README pour Ubuntu: AppArmor restricts unprivileged user namespaces by default.

            bortzmeyer@mastodon.gougere.frB This user is from outside of this forum
            bortzmeyer@mastodon.gougere.frB This user is from outside of this forum
            bortzmeyer@mastodon.gougere.fr
            wrote last edited by
            #10

            @decio Debian 13 (stable) à jour.

            1 Reply Last reply
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            • decio@infosec.exchangeD decio@infosec.exchange

              @bortzmeyer Intéressant, tu peux me dire sur quelle distro/version ?
              Je n'ai pas encore eu le temps de le tester sur mes conteneurs & Debian/Kali, mais d'après le README pour Ubuntu: AppArmor restricts unprivileged user namespaces by default.

              bortzmeyer@mastodon.gougere.frB This user is from outside of this forum
              bortzmeyer@mastodon.gougere.frB This user is from outside of this forum
              bortzmeyer@mastodon.gougere.fr
              wrote last edited by
              #11

              @decio J'ai essayé avec et sans l'autorisation de création des namespaces, pareil.

              decio@infosec.exchangeD 1 Reply Last reply
              0
              • decio@infosec.exchangeD decio@infosec.exchange

                @bortzmeyer Intéressant, tu peux me dire sur quelle distro/version ?
                Je n'ai pas encore eu le temps de le tester sur mes conteneurs & Debian/Kali, mais d'après le README pour Ubuntu: AppArmor restricts unprivileged user namespaces by default.

                bortzmeyer@mastodon.gougere.frB This user is from outside of this forum
                bortzmeyer@mastodon.gougere.frB This user is from outside of this forum
                bortzmeyer@mastodon.gougere.fr
                wrote last edited by
                #12

                @decio C'est pas que chez moi (même message d'erreur) https://x.com/idratherwork/status/2054500111917470017

                decio@infosec.exchangeD 1 Reply Last reply
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                • bortzmeyer@mastodon.gougere.frB bortzmeyer@mastodon.gougere.fr

                  @decio C'est pas que chez moi (même message d'erreur) https://x.com/idratherwork/status/2054500111917470017

                  decio@infosec.exchangeD This user is from outside of this forum
                  decio@infosec.exchangeD This user is from outside of this forum
                  decio@infosec.exchange
                  wrote last edited by
                  #13

                  @bortzmeyer yep !
                  XFRM_MSG_NEWSA ack errno=22

                  Donc Debian rejette la configuration XFRM spécifique

                  bortzmeyer@mastodon.gougere.frB 1 Reply Last reply
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                  • decio@infosec.exchangeD decio@infosec.exchange

                    @bortzmeyer yep !
                    XFRM_MSG_NEWSA ack errno=22

                    Donc Debian rejette la configuration XFRM spécifique

                    bortzmeyer@mastodon.gougere.frB This user is from outside of this forum
                    bortzmeyer@mastodon.gougere.frB This user is from outside of this forum
                    bortzmeyer@mastodon.gougere.fr
                    wrote last edited by
                    #14

                    @decio Reste à savoir si le POC peut être modifié pour fonctionner sur Debian, ou bien si c'est une limite plus fondamentale de Fragnesia (qui ne serait pas si universel que ça).

                    decio@infosec.exchangeD 1 Reply Last reply
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                    • bortzmeyer@mastodon.gougere.frB bortzmeyer@mastodon.gougere.fr

                      @decio Reste à savoir si le POC peut être modifié pour fonctionner sur Debian, ou bien si c'est une limite plus fondamentale de Fragnesia (qui ne serait pas si universel que ça).

                      decio@infosec.exchangeD This user is from outside of this forum
                      decio@infosec.exchangeD This user is from outside of this forum
                      decio@infosec.exchange
                      wrote last edited by
                      #15

                      @bortzmeyer sur ma kali same same !

                      └─$ grep ESPINTCP /boot/config-$(uname -r)

                      CONFIG_INET_ESPINTCP is not set

                      CONFIG_INET6_ESPINTCP is not set

                      (6.8.11-amd64 #1 SMP PREEMPT_DYNAMIC Kali 6.8.11-1kali2 (2024-05-30))

                      c'est explicitement désactivé dans le kernel Kali (et vraisemblablement tout le kernel Debian).

                      GG Debian 🤘 👍

                      Cela semble donc Ubuntu-centrique...

                      bortzmeyer@mastodon.gougere.frB 1 Reply Last reply
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                      • decio@infosec.exchangeD decio@infosec.exchange

                        @bortzmeyer sur ma kali same same !

                        └─$ grep ESPINTCP /boot/config-$(uname -r)

                        CONFIG_INET_ESPINTCP is not set

                        CONFIG_INET6_ESPINTCP is not set

                        (6.8.11-amd64 #1 SMP PREEMPT_DYNAMIC Kali 6.8.11-1kali2 (2024-05-30))

                        c'est explicitement désactivé dans le kernel Kali (et vraisemblablement tout le kernel Debian).

                        GG Debian 🤘 👍

                        Cela semble donc Ubuntu-centrique...

                        bortzmeyer@mastodon.gougere.frB This user is from outside of this forum
                        bortzmeyer@mastodon.gougere.frB This user is from outside of this forum
                        bortzmeyer@mastodon.gougere.fr
                        wrote last edited by
                        #16

                        @decio https://www.bortzmeyer.org/fragnesia.html

                        1 Reply Last reply
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                        • bortzmeyer@mastodon.gougere.frB bortzmeyer@mastodon.gougere.fr

                          @decio J'ai essayé avec et sans l'autorisation de création des namespaces, pareil.

                          decio@infosec.exchangeD This user is from outside of this forum
                          decio@infosec.exchangeD This user is from outside of this forum
                          decio@infosec.exchange
                          wrote last edited by
                          #17

                          @bortzmeyer Effectivement sur Ubuntu 24.04 kernel 6.8 non patché + AppArmor désactivé =

                          192/192 bytes ✅ whoami → root 🎉

                          Exploit confirmé.

                          AppArmor tient la barrière, ne le désactivez pas 😉

                          #fragnesia #linux #lpe

                          decio@infosec.exchangeD 1 Reply Last reply
                          0
                          • decio@infosec.exchangeD decio@infosec.exchange

                            @bortzmeyer Effectivement sur Ubuntu 24.04 kernel 6.8 non patché + AppArmor désactivé =

                            192/192 bytes ✅ whoami → root 🎉

                            Exploit confirmé.

                            AppArmor tient la barrière, ne le désactivez pas 😉

                            #fragnesia #linux #lpe

                            decio@infosec.exchangeD This user is from outside of this forum
                            decio@infosec.exchangeD This user is from outside of this forum
                            decio@infosec.exchange
                            wrote last edited by
                            #18

                            et voilà il a reçu son nom de code CVE-2026-46300

                            1 Reply Last reply
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