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Oracle Linux 8 — dnsmasq — security and stability fixes — required update — diagnosis and fix on Oracle Linux 8

Oracle Linux 8 — dnsmasq — security and stability fixes — required update (ELSA-2021-4153)

🟡 Medium   ⏱ 10–30 min  Last verified: 25 May 2021 Affected versions: Oracle Linux 8 📖 ~4 min read  •  Source: ELSA advisory ELSA-2021-4153 Related CVEs: CVE-2021-3448 Table of contents Symptom & Impact Environment & Reproduction Root Cause Analysis Quick Triage Step-by-Step Diagnosis Solution – Primary Fix Solution – Alternative Approaches Verification & Acceptance […]

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Common Problems 115023

RHEL 8 SSH login is slow due to DNS and GSSAPI timeouts

🟡 Medium   ⏱ 5–30 min  Last verified: 25 May 2021 📖 ~1 min read Table of contents Symptom & Impact Environment & Reproduction Root Cause Analysis Quick Triage Step-by-Step Diagnosis Solution – Primary Fix Solution – Alternative Approaches Verification & Acceptance Criteria Rollback Plan Prevention & Hardening Related Errors & Cross-Refs References & Further […]

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What is an HTML Element? — step-by-step DevOps tutorial on Progressive Robot

What is an HTML Element?

An HTML element is a component of an HTML document that tells a web browser how to structure and interpret a part of the HTML document. HTML elements can contain formatting instructions, semantic meaning, and content.

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AlmaLinux 8 — brltty — vulnerability — patch and remediation guide — diagnosis and fix on AlmaLinux 8

AlmaLinux 8 — brltty — vulnerability — patch and remediation guide

🟡 Medium   ⏱ 10–30 min  Last verified: 25 May 2026 Affected versions: AlmaLinux 8 📖 ~4 min read  •  Source: AlmaLinux ALSA ALBA-2021:1765 Upstream summary: For detailed information on changes in this release, see the AlmaLinux Release Notes linked from the References section. Table of contents Symptom & Impact Environment & Reproduction Root Cause […]

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How to Secure Apache with Let's Encrypt on SLES 15 — step-by-step SUSE Linux Enterprise 15 tutorial on Progressive Robot

How to Secure Apache with Let’s Encrypt on SLES 15

Introduction This tutorial covers How to Secure Apache with Let’s Encrypt on SLES 15 on SLES 15. SLES 15 (SUSE Linux Enterprise Server 16) is SUSE’s enterprise-grade Linux distribution. It uses the zypper package manager, AppArmor for mandatory access control, and systemctl for service management. Prerequisites Ensure your SLES 15 system is up to date: […]

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FreeBSD 13 — isc-dhcp — vulnerability — patch and remediation guide — diagnosis and fix on FreeBSD 13

FreeBSD 13 — isc-dhcp — vulnerability — patch and remediation guide

🟢 Low   ⏱ 5–15 min  Last verified: 25 May 2021 Affected versions: FreeBSD 13 📖 ~4 min read  •  Source: FreeBSD VuXML VuXML topic: isc-dhcpd — format string vulnerabilities Related CVEs: CVE-2004-1006 Upstream summary: The ISC DHCP programs are vulnerable to several format string vulnerabilities which may allow a remote attacker to execute arbitrary […]

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FreeBSD 13 — 3proxy — security advisory — patch and remediation guide — diagnosis and fix on FreeBSD 13

FreeBSD 13 — 3proxy — security advisory — patch and remediation guide

🟢 Low   ⏱ 5–15 min  Last verified: 25 May 2021 Affected versions: FreeBSD 13 📖 ~4 min read  •  Source: FreeBSD VuXML VuXML topic: fd_set — bitmap index overflow in multiple applications Upstream summary: 3APA3A reports: If programmer fails to check socket number before using select() or fd_set macros, it's possible to overwrite memory […]

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AlmaLinux 8 — kronosnet — vulnerability — patch and remediation guide — diagnosis and fix on AlmaLinux 8

AlmaLinux 8 — kronosnet — vulnerability — patch and remediation guide

🟡 Medium   ⏱ 10–30 min  Last verified: 25 May 2026 Affected versions: AlmaLinux 8 📖 ~4 min read  •  Source: AlmaLinux ALSA ALBA-2022:2127 Upstream summary: For detailed information on changes in this release, see the AlmaLinux Release Notes linked from the References section. Table of contents Symptom & Impact Environment & Reproduction Root Cause […]

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