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Peter CzanikMy blog suddenly has many visitors from <a href="https://fosstodon.org/tags/Russia" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#Russia</a>. I wonder what they think about my story: I can thank my <a href="https://fosstodon.org/tags/infosec" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#infosec</a> carrier to <a href="https://fosstodon.org/tags/Russian" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#Russian</a> students, who were a major PITA. I learned <a href="https://fosstodon.org/tags/network" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#network</a> sniffing, <a href="https://fosstodon.org/tags/hardening" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#hardening</a>, <a href="https://fosstodon.org/tags/ssh" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#ssh</a> because of them :-)<a href="https://peter.czanik.hu/posts/russian_students_logging/" rel="nofollow noopener noreferrer" translate="no" target="_blank">https://peter.czanik.hu/posts/russian_students_logging/</a><a href="https://fosstodon.org/tags/LogManagement" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#LogManagement</a>

Richard Chamberlain🔐 Tired of exposing your admin account to SSH risks?Learn how to set up a restricted SSH user with rbash and switch to your admin account after login. A simple way to shrink your attack surface and boost security.Full guide 👉 <a href="https://richard-sebos.github.io/sebostechnology/posts/Restricted-Access/" rel="nofollow noopener noreferrer" translate="no" target="_blank">https://richard-sebos.github.io/sebostechnology/posts/Restricted-Access/</a><a href="https://mastodon.social/tags/Linux" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#Linux</a> <a href="https://mastodon.social/tags/SSH" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#SSH</a> <a href="https://mastodon.social/tags/SysAdmin" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#SysAdmin</a> <a href="https://mastodon.social/tags/Security" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#Security</a> <a href="https://mastodon.social/tags/Hardening" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#Hardening</a> <a href="https://mastodon.social/tags/FOSS" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#FOSS</a> <a href="https://mastodon.social/tags/DevOps" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#DevOps</a> <a href="https://mastodon.social/tags/Infosec" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#Infosec</a>

Redhotcyber🛌💻 "Ho disattivato l’RDP pubblico… o stavo solo sognando?" <a href="https://mastodon.bida.im/tags/JustAnotherDayInCybersecurity" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#JustAnotherDayInCybersecurity</a><a href="https://mastodon.bida.im/tags/redhotcyber" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#redhotcyber</a> <a href="https://mastodon.bida.im/tags/meme" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#meme</a> <a href="https://mastodon.bida.im/tags/memengineering" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#memengineering</a> <a href="https://mastodon.bida.im/tags/comics" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#comics</a> <a href="https://mastodon.bida.im/tags/ridere" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#ridere</a> <a href="https://mastodon.bida.im/tags/cringe" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#cringe</a> <a href="https://mastodon.bida.im/tags/hacking" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#hacking</a> <a href="https://mastodon.bida.im/tags/cybersecurity" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#cybersecurity</a> <a href="https://mastodon.bida.im/tags/cybercrime" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#cybercrime</a> <a href="https://mastodon.bida.im/tags/intelligence" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#intelligence</a> <a href="https://mastodon.bida.im/tags/intelligenzaartificiale" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#intelligenzaartificiale</a> <a href="https://mastodon.bida.im/tags/informationsecurity" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#informationsecurity</a> <a href="https://mastodon.bida.im/tags/ethicalhacking" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#ethicalhacking</a> <a href="https://mastodon.bida.im/tags/infosecurity" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#infosecurity</a> <a href="https://mastodon.bida.im/tags/RHCmeme" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#RHCmeme</a> <a href="https://mastodon.bida.im/tags/Awareness" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#Awareness</a> <a href="https://mastodon.bida.im/tags/Hardening" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#Hardening</a> <a href="https://mastodon.bida.im/tags/RDP" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#RDP</a> <a href="https://mastodon.bida.im/tags/NightmareOps" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#NightmareOps</a> <a href="https://mastodon.bida.im/tags/DevSecOps" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#DevSecOps</a> <a href="https://mastodon.bida.im/tags/RHCMEME" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#RHCMEME</a>

Solarbird :flag_cascadia:and this is what it looks like cleaned up<a href="https://mastodon.murkworks.net/tags/diy" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#diy</a> <a href="https://mastodon.murkworks.net/tags/hardening" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#hardening</a> <a href="https://mastodon.murkworks.net/tags/metalworking" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#metalworking</a>

Solarbird :flag_cascadia:these all went POW outwards when quenching<a href="https://mastodon.murkworks.net/tags/diy" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#diy</a> <a href="https://mastodon.murkworks.net/tags/MetalWorking" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#MetalWorking</a> <a href="https://mastodon.murkworks.net/tags/hardening" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#hardening</a>

Solarbird :flag_cascadia:this is about the best I could do (this is the other side) - it doesn’t want to get any hotter than this :/<a href="https://mastodon.murkworks.net/tags/diy" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#diy</a> <a href="https://mastodon.murkworks.net/tags/MetalWorking" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#MetalWorking</a> <a href="https://mastodon.murkworks.net/tags/hardening" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#hardening</a>

Solarbird :flag_cascadia:now it has a frenwtfseriously how shite is this metal<a href="https://mastodon.murkworks.net/tags/diy" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#diy</a> <a href="https://mastodon.murkworks.net/tags/MetalWorking" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#MetalWorking</a> <a href="https://mastodon.murkworks.net/tags/hardening" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#hardening</a>

Solarbird :flag_cascadia:it bulgy? or optical illusion. let’s not touch to find out<a href="https://mastodon.murkworks.net/tags/diy" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#diy</a> <a href="https://mastodon.murkworks.net/tags/metalworking" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#metalworking</a> <a href="https://mastodon.murkworks.net/tags/hardening" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#hardening</a>

Solarbird :flag_cascadia:uh whut now?why?<a href="https://mastodon.murkworks.net/tags/metalworking" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#metalworking</a> <a href="https://mastodon.murkworks.net/tags/diy" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#diy</a> <a href="https://mastodon.murkworks.net/tags/hardening" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#hardening</a>

Solarbird :flag_cascadia:time for Hot<a href="https://mastodon.murkworks.net/tags/diy" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#diy</a> <a href="https://mastodon.murkworks.net/tags/MetalWorking" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#MetalWorking</a> <a href="https://mastodon.murkworks.net/tags/sorta" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#sorta</a> <a href="https://mastodon.murkworks.net/tags/hardening" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#hardening</a>

13reak :fedora:Interesting defense against attacks: Move your SSH <code>authorized_keys</code> to a different location and set the rights to <code>0444</code>. Then an attacker needs root rights to place an SSH backdoor.<a href="https://isc.sans.edu/diary/31986" rel="nofollow noopener noreferrer" translate="no" target="_blank">https://isc.sans.edu/diary/31986</a><a href="https://infosec.exchange/tags/DFIR" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#DFIR</a> <a href="https://infosec.exchange/tags/knowledgedrop" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#knowledgedrop</a> <a href="https://infosec.exchange/tags/hardening" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#hardening</a>

Chema Alonso :verified:El lado del mal - 17 Edición del Máster Online en Ciberseguridad en el Campus de Ciberseguridad: Promoción 2025-2026 Abierto el Registro <a href="https://www.elladodelmal.com/2025/05/17-edicion-del-master-online-en.html" rel="nofollow noopener noreferrer" translate="no" target="_blank">https://www.elladodelmal.com/2025/05/17-edicion-del-master-online-en.html</a> <a href="https://ioc.exchange/tags/m%C3%A1ster" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#máster</a> <a href="https://ioc.exchange/tags/hacking" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#hacking</a> <a href="https://ioc.exchange/tags/ciberseguridad" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#ciberseguridad</a> <a href="https://ioc.exchange/tags/hardening" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#hardening</a> <a href="https://ioc.exchange/tags/pentesting" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#pentesting</a> <a href="https://ioc.exchange/tags/formacion" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#formacion</a> <a href="https://ioc.exchange/tags/Master" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#Master</a> <a href="https://ioc.exchange/tags/Universidad" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#Universidad</a> <a href="https://ioc.exchange/tags/curso" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#curso</a>

Tim (Wadhwa-)Brown :donor:Landlock is coming on nicely:<a href="https://lore.kernel.org/landlock/20250519.ceihohf6a3uT@digikod.net/" rel="nofollow noopener noreferrer" translate="no" target="_blank">https://lore.kernel.org/landlock/20250519.ceihohf6a3uT@digikod.net/</a><a href="https://infosec.exchange/tags/linux" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#linux</a>, <a href="https://infosec.exchange/tags/hardening" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#hardening</a>

Who Let The Dogs Out 🐾<a href="https://mastodon.ml/tags/Linux" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#Linux</a> <a href="https://mastodon.ml/tags/security" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#security</a> <a href="https://mastodon.ml/tags/hardening" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#hardening</a>**How To Secure A Linux Server**An evolving how-to guide for securing a Linux server that, hopefully, also teaches you a little about security and why it matters.<a href="https://github.com/imthenachoman/How-To-Secure-A-Linux-Server" rel="nofollow noopener noreferrer" translate="no" target="_blank">https://github.com/imthenachoman/How-To-Secure-A-Linux-Server</a><a href="https://github.com/moltenbit/How-To-Secure-A-Linux-Server-With-Ansible" rel="nofollow noopener noreferrer" translate="no" target="_blank">https://github.com/moltenbit/How-To-Secure-A-Linux-Server-With-Ansible</a>

PatoJADHoy en nuestro curso de <a href="https://mastodon.social/tags/almalinux" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#almalinux</a> hablamos de <a href="https://mastodon.social/tags/hardening" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#hardening</a> <a href="https://youtu.be/GjSc-KzDm0s" rel="nofollow noopener noreferrer" translate="no" target="_blank">https://youtu.be/GjSc-KzDm0s</a><a href="https://mastodon.social/tags/linux" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#linux</a> <a href="https://mastodon.social/tags/servidores" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#servidores</a> <a href="https://mastodon.social/tags/curso" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#curso</a>

Chema Alonso :verified:El lado del mal - Taxonomía de Fallos de Seguridad en Agentic AI: Memory Poisoning Attack con Cross-Domain Prompt Injection Attack (XPIA) <a href="https://www.elladodelmal.com/2025/05/taxonomia-de-fallos-de-seguridad-en.html" rel="nofollow noopener noreferrer" translate="no" target="_blank">https://www.elladodelmal.com/2025/05/taxonomia-de-fallos-de-seguridad-en.html</a> <a href="https://ioc.exchange/tags/IA" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#IA</a> <a href="https://ioc.exchange/tags/AI" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#AI</a> <a href="https://ioc.exchange/tags/PromptInjection" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#PromptInjection</a> <a href="https://ioc.exchange/tags/XPIA" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#XPIA</a> <a href="https://ioc.exchange/tags/AgenticAI" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#AgenticAI</a> <a href="https://ioc.exchange/tags/InteligenciaArtificial" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#InteligenciaArtificial</a> <a href="https://ioc.exchange/tags/Hacking" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#Hacking</a> <a href="https://ioc.exchange/tags/Ciberseguridad" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#Ciberseguridad</a> <a href="https://ioc.exchange/tags/hardening" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#hardening</a>

Chema Alonso :verified:El lado del mal - Cómo pasar del exploit automático de bugs hecho por IA a la detección de malware en nanosegundos con eBPF & Spectral Clustering <a href="https://www.elladodelmal.com/2025/05/como-pasar-del-exploit-automatico-de.html" rel="nofollow noopener noreferrer" translate="no" target="_blank">https://www.elladodelmal.com/2025/05/como-pasar-del-exploit-automatico-de.html</a> <a href="https://ioc.exchange/tags/malware" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#malware</a> <a href="https://ioc.exchange/tags/hardening" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#hardening</a> <a href="https://ioc.exchange/tags/kernel" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#kernel</a> <a href="https://ioc.exchange/tags/ebpf" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#ebpf</a> <a href="https://ioc.exchange/tags/exploiting" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#exploiting</a> <a href="https://ioc.exchange/tags/bug" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#bug</a>

aaron ~# :blinkingcursor:I nearly finished the transition to <a href="https://infosec.exchange/tags/ansible" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#ansible</a> now and it feels great! I've done system <a href="https://infosec.exchange/tags/hardening" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#hardening</a>, <a href="https://infosec.exchange/tags/docker" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#docker</a> deployments and package management. I'll now have to set up some more services, add my desktops to be managed and create a shared <a href="https://infosec.exchange/tags/zfs" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#zfs</a> pool.The effort is worth it.

Tiago F<a href="https://medium.com/@js_9757/advanced-nginx-hardening-15bf96058327" rel="nofollow noopener noreferrer" translate="no" target="_blank">https://medium.com/@js_9757/advanced-nginx-hardening-15bf96058327</a><a href="https://bolha.us/tags/nginx" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#nginx</a> <a href="https://bolha.us/tags/howto" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#howto</a> <a href="https://bolha.us/tags/hardening" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#hardening</a>

TZLAnyone currently have a take on the <a href="https://mstdn.social/tags/security" class="mention hashtag" rel="tag">#security</a> concerns of <a href="https://mstdn.social/tags/linux" class="mention hashtag" rel="tag">#linux</a> <a href="https://mstdn.social/tags/kernel" class="mention hashtag" rel="tag">#kernel</a> user <a href="https://mstdn.social/tags/namespaces" class="mention hashtag" rel="tag">#namespaces</a> <a href="https://mstdn.social/tags/usernamespaces" class="mention hashtag" rel="tag">#usernamespaces</a>? I have been rereading into it wondering whether enabling or disabling is the best approach. They seem rather insignificant with considerable surface area for attack, from my understanding. However, more applications check for/need them nowadays.I think kernel <a href="https://mstdn.social/tags/hardening" class="mention hashtag" rel="tag">#hardening</a> advice is still to disable. Makes me wonder if should e.g. be considered only if <a href="https://mstdn.social/tags/AppArmor" class="mention hashtag" rel="tag">#AppArmor</a> / <a href="https://mstdn.social/tags/SELinux" class="mention hashtag" rel="tag">#SELinux</a> is active.

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#hardening