épisode 5 et dernier du TP #serveur #web Linux, édition 2026, spécial débutants en #sysadmin, aujourd'hui on cause de #sudo #openssh et de #HTTPS tout de suite sur https://twitch.tv/ahp_nils #twitchfr #twitchstreamer #TwitchStreamers #debian #ubuntu #virtualisation #nginx
AHP_Nils - Twitch

Sysadmin depuis près de 15 ans, j’utilise cette chaîne pour principalement deux choses : continuer à progresser dans des domaines technologiques, ainsi que partager mes apprentissages et découvertes.Venez apprendre avec moi le fonctionnement d'Internet et de ses composants !

Twitch

Уязвимость в GSSAPI-патче к OpenSSH, удалённо эксплуатируемая на стадии до аутентификации

В применяемом во многих дистрибутивах Linux патче gssapi.patch, добавляющем в OpenSSH поддержку обмена ключей на базе GSSAPI, выявлена уязвимость (CVE-2026-3497), приводящая к разыменованию указателя, повреждению памяти и обходу механизма разделения привилегий (Privsep). Уязвимость может быть эксплуатирована удалённо на стадии до осуществления аутентификации. Выявивший проблему исследователь продемонстрировал инициирование аварийного завершения процесса через отправку на SSH-сервер одного модифицированного сетевого пакета. Не исключается, что помимо отказа в обслуживании, существуют более опасные варианты эксплуатации уязвимости.

https://www.opennet.ru/opennews/art.shtml?num=64983

#Linux #openSSH #vulnerability

Уязвимость в GSSAPI-патче к OpenSSH, удалённо эксплуатируемая на стадии до аутентификации

В применяемом во многих дистрибутивах Linux патче gssapi.patch , добавляющем в OpenSSH поддержку обмена ключей на базе GSSAPI, выявлена уязвимость ( CVE-2026-3497 ), приводящая к разыменованию указателя, повреждению памяти и обходу механизма разделения привилегий ( Privsep ). Уязвимость может быть эксплуатирована удалённо на стадии до осуществления аутентификации. Выявивший проблему исследователь продемонстрировал инициирование аварийного завершения процесса через отправку на SSH-сервер одного модифицированного сетевого пакета. Не исключается, что помимо отказа в обслуживании, существуют более опасные варианты эксплуатации уязвимости

Stuck SSH session? Don't kill your terminal. Press Enter, type ~. and it closes instantly. Learn all 10 SSH escape sequences most Linux users never discover.

More details here: https://ostechnix.com/ssh-escape-sequences-beginners-guide/

#SSH #SecureShell #SSHTips #OpenSSH #Linux #TerminalHacks #SysAdmin #Commandline

SSH Escape Sequences Guide: Fix Frozen SSH Sessions Instantly - OSTechNix

Stuck SSH session? Press Enter, type ~. to close frozen SSH instantly. Learn all SSH escape sequences most users never discover.

OSTechNix

Opening DebConf 26 registration, improvements to #Debian CI and many more contributions to Debian were made by #Freexian collaborators in February.

Read all the details at https://www.freexian.com/blog/debian-contributions-02-2026/?utm_source=mastodon&utm_medium=social

We thank the organizations subscribing to our Long Term Support contracts (https://www.freexian.com/lts/?utm_source=mastodon&utm_medium=social) and consulting services (https://www.freexian.com/services/?utm_source=mastodon&utm_medium=social) for making this possible.

#debianci #debconf26 #openssh

Debian Contributions: Opening DebConf 26 Registration, Debian CI improvements and more!

Debian Contributions: 2026-02 Contributing to Debian is part of Freexian’s mission. This article covers the latest achievements of Freexian and their collaborators. All of this is made possible by organizations subscribing to our Long Term Support contracts and consulting services. DebConf 26 Registration, by Stefano Rivera, Antonio Terceiro, and Santiago Ruano Rincón DebConf 26, to be held in Santa Fe Argentina in July, has opened for registration and event proposals. Stefano, Antonio, and Santiago all contributed to making this happen.

Freexian
Got some progress with protocol transition in #OpenSSH: if you login with any authentication mechanism that does not lead to creation of #Kerberos tickets, now you can configure your server to generate one on the user's behalf. This uses Services For User (S4U) extensions available in Active Directory and #FreeIPA implementations. There are few issues we still trying to address (and bugs found during this development) but it looks promising.

Couple demos in the next toots:

`WARNING: connection is not using a post-quantum key exchange algorithm.`

Well that's a new one.

#ssh #OpenSSH #crypto #ActualCryptoNotStupidSpeculation #QuantumCryptography

I submitted a Pull Request to update MacPorts' libssh to 0.12.0 here:

https://github.com/macports/macports-ports/pull/31472

3 of 3 of GitHub Continuous Integration checks passed.

It's up to someone else with commit access to merge it.

I'm not the maintainer, nor am I really a user of libssh, so some things are not particularly tested (I did attempt to run "port -vst install" but tbh even "port -v install" was failing due to some weird kerberos defaults and I don't run kerberos locally, for good reasons. Also, I don't really use anything dependent upon libssh).

It was more that I was having dreams about OpenSSH and figured I should test a snapshot (no issues there, phew!) but noticed that libssh had been version bumped (more than one actually, there's also a 0.11.4 release) and there were security related issues, so it seemed worth at least submitting a Pull Request since it had apparently slipped under the maintainer's radar? The Portfile is also listed as openmaintainer, so I am guessing a little outside assistance is welcome.

Hopefully it helps some others! Doesn't do much of anything for me.

Hopefully it doesn't break anything for others; that I am less certain about.

#libssh #MacPorts #OpenSource #Security #OpenSSH
FOSS is important. Donations from the client in progress. The ability to compile, from source, OpenSSL and OpenSSH on an old bespoke "Debian 8-ish" based ARM device means hundreds of devices get a few more years of life. #FOSS #OpenSSL #OpenSSH