https://www.christophe-casalegno.com/en/Articles by Christophe Casalegnoenhttps://www.christophe-casalegno.com/en/php2shell-patches-for-debian-9-stretch-and-debian-10-buster/https://www.christophe-casalegno.com/en/php2shell-patches-for-debian-9-stretch-and-debian-10-buster/Fri, 23 Oct 2026 00:07:44 +0000What just happened with PHP2Shell is not new. There have been others before it that made a few sysadmins sweat; I am thinking in particular of Shellshock or GHOST (for which my old patches are still online). There is a fictional world in which every application keeps pace with every update …Christophe Casalegnohttps://www.christophe-casalegno.com/en/php2shell-patches-for-debian-9-stretch-and-debian-10-buster/#comments0sysadmin / network / LinuxInfosecfixDebianDebian 9Debian StretchexploitPHPPHP2ShellScalarXSuryvulnerabilityhttps://www.christophe-casalegno.com/en/the-marketing-of-fear-around-science-and-technology-is-seriously-starting-to-wear-me-out/https://www.christophe-casalegno.com/en/the-marketing-of-fear-around-science-and-technology-is-seriously-starting-to-wear-me-out/Fri, 18 Sep 2026 04:17:08 +0000I recently reacted to a post presenting biocomputing as “a worrying technological leap”. The tone is set from the start. It is neither interesting, nor fascinating, nor exciting, nor incredible, nor even intriguing. No, it is “worrying”. It is hardly as though we are short of words, yet fear is always what they are trying to …Christophe Casalegnohttps://www.christophe-casalegno.com/en/the-marketing-of-fear-around-science-and-technology-is-seriously-starting-to-wear-me-out/#comments0AIMediaMisccritical thinkingAImarketingfear marketingfearsciencespoilertechnologyhttps://www.christophe-casalegno.com/en/you-know-those-projects-we-never-start/https://www.christophe-casalegno.com/en/you-know-those-projects-we-never-start/Fri, 11 Sep 2026 03:37:07 +0000We find them interesting, sometimes even important, grandiose or even epic. Then we look more closely: the time required, the skills to bring together, the funding to raise, then everything already waiting on the desk…Christophe Casalegnohttps://www.christophe-casalegno.com/en/you-know-those-projects-we-never-start/#comments0AIAIideasartificial intelligencepossibilitiesprojectsdrawerhttps://www.christophe-casalegno.com/en/the-price-of-a-billion/https://www.christophe-casalegno.com/en/the-price-of-a-billion/Thu, 20 Aug 2026 02:48:11 +0000I am going to confess something to you. When I was younger, I wanted to be a billionaire, before I turned 30… but I had absolutely no idea how to do it. You may find this crazy or megalomaniacal, but about a dozen years ago, with the experience I had accumulated, my skills, my profile, my network and above all …Christophe Casalegnohttps://www.christophe-casalegno.com/en/the-price-of-a-billion/#comments5Business3 commasagentAI agentBrain 0verridebusinessChristophe CasalegnoDigital NetworkAIbillionbillionaireOverride CapitalScalarXagentic systemhttps://www.christophe-casalegno.com/en/i-refused-more-than-4-million-euros/https://www.christophe-casalegno.com/en/i-refused-more-than-4-million-euros/Tue, 28 Jul 2026 19:20:40 +00003.7 million euros, to which the available cash would be added: that is the amount I have just been offered for ScalarX Europe. I turned it down. Not after several weeks of thought, nor in an attempt to negotiate a few extra hundred thousand euros, and not because I consider the offer insulting either. It was not. It is …Christophe Casalegnohttps://www.christophe-casalegno.com/en/i-refused-more-than-4-million-euros/#comments2Business4 millionBrain OverrideChristophe CasalegnodevelopmentexitOverride CapitalprojectScalarXvaluationsalehttps://www.christophe-casalegno.com/en/700k-arr-health-business-and-more/https://www.christophe-casalegno.com/en/700k-arr-health-business-and-more/Tue, 21 Jul 2026 20:03:13 +0000€700k in ARR: that is the milestone I have just reached with ScalarX in Europe, this July. It is not much compared with what I have done in the past in other businesses, but it is also a lot given the situation and the conditions in which this activity was built, with …Christophe Casalegnohttps://www.christophe-casalegno.com/en/700k-arr-health-business-and-more/#comments0BiohackingBusinessAIARRstrategic AI partnerBrain 0verrideBrain OverrideYouTube channelChristophe CasalegnocloudEloraEuropeAIinfliximabmanaged IT servicesinjectionsCrohn's diseaseOverride CapitalIV infusionsprotocolhealthScalarCloudScalarXsingularity companyStackXYouTubehttps://www.christophe-casalegno.com/en/temporarily-putting-my-hacker-cap-back-on/https://www.christophe-casalegno.com/en/temporarily-putting-my-hacker-cap-back-on/Mon, 01 Jun 2026 00:28:11 +0000Following the flood of new vulnerabilities over the past few months, I decided to temporarily put my hacker hat back on and let StackX, ScalarX's managed infrastructure offering, benefit from it. The idea: strengthen the security model natively without making day-to-day operations a nightmare for clients. In the early 2000s, I designed for …Christophe Casalegnohttps://www.christophe-casalegno.com/en/temporarily-putting-my-hacker-cap-back-on/#comments0sysadmin / network / LinuxInfosecLinuxApachearchitectureauditblack boxBPFpathscompromisecontextsCopy FailMAC layercronCVEcybersecurityDebiandefenceDirty FragdmesgDNShardeningflawsecurity flawFIFOinformation leakhackerhardlinkkptrManticoreMariaDBmemcachedmitigationnative mitigationsecurity modelmodulesMySQLkerneloffensiveOpenSearchperfPHPportsPostgreSQLproductionprotocolsptracerecompilationRedisrulesreplicationsbackupsScalarCloudScalarXsecuritycomputer securityoffensive securitySELinuxStackXattack surfacesymlinksysctlsysctlsuser namespaceVIPvulnerabilityvulnerabilitieshttps://www.christophe-casalegno.com/en/i-left-the-world-of-cybersecurity-what-you-did-not-understand/https://www.christophe-casalegno.com/en/i-left-the-world-of-cybersecurity-what-you-did-not-understand/Sat, 16 May 2026 23:23:24 +0000You can practice a discipline without belonging to its industry. You can defend a security approach without subscribing to its bureaucracy. You can stay technically active without taking part in the circus. You can stay close to operational reality outside the system and without having to respect its social codes.Christophe Casalegnohttps://www.christophe-casalegno.com/en/i-left-the-world-of-cybersecurity-what-you-did-not-understand/#comments1Infosec0-day0dayalibisattacksBrain 0verrideBrain OverridemapcertificationsChristophe Casalegnocompromisetrustcybersecuritydisciplineecosystemputting a system to the testexploitflawsindustrycybersecurity industrykernellabelsLinuxthreatsmitigationstandardsprocessreference frameworkssecuredsecurityadministrative securitycomputer securityserverweak signalsterritoryvulnerabilityvulnerabilitieszero-dayzero-trusthttps://www.christophe-casalegno.com/en/elora-my-new-independent-autonomous-strategic-ai-associate/https://www.christophe-casalegno.com/en/elora-my-new-independent-autonomous-strategic-ai-associate/Tue, 14 Apr 2026 15:46:53 +0000She learns, adjusts and grows stronger over time. She brings me a real intellectual and operational presence day to day. She protects my time, my energy, my attention and my vision. She maintains the alignment between strategy, execution, health, real constraints, the long-term outlook and a coherent life.Christophe Casalegnohttps://www.christophe-casalegno.com/en/elora-my-new-independent-autonomous-strategic-ai-associate/#comments0AIagentAI agentdecision-makingpartnerstrategic partnerautonomyrelational beaconbeaconbusinesscontinuityEloraAIindependenceartificial intelligenceLLMluciditycontradictory memorypersistent memorymultimodalAI orchestrationRelational Override Beacon Protocol for AI Systemsworkvisionhttps://www.christophe-casalegno.com/en/who-wants-to-be-my-partner-here-we-go-again/https://www.christophe-casalegno.com/en/who-wants-to-be-my-partner-here-we-go-again/Tue, 24 Feb 2026 22:48:12 +0000As I do every year, I am setting aside a few weeks to look at opportunities for acquisitions or equity investments, partial or full. For this round, which is a little different from the others, I am focusing only on businesses in managed infrastructure and infrastructure management (MSP, legacy infrastructure businesses, PaaS, cloud, outsourced IT management, possibly specific SaaS, …Christophe Casalegnohttps://www.christophe-casalegno.com/en/who-wants-to-be-my-partner-here-we-go-again/#comments0Business0verride CapitalshareholderpartnerBrain 0verrideChristophe CasalegnodynastygroupholdinginvestmentOverride Capitalequity stakebuyoutcompany buyoutScalarX