Package Management

Ubuntu 20.04 — atftp — multiple vulnerabilities (3 CVEs) — patch and remediation guide — diagnosis and fix on Ubuntu 20.04

Ubuntu 20.04 — atftp — multiple vulnerabilities (3 CVEs) — patch and remediation guide

🟡 Medium   ⏱ 10–30 min  Last verified: 7 December 2021 Affected versions: Ubuntu 20.04 (focal) 📖 ~4 min read  •  Source: Ubuntu Security Notice USN-6334-1 Related CVEs: CVE-2020-6097 CVE-2021-41054 CVE-2021-46671 Upstream summary: Peter Wang discovered that atftp did not properly manage certain inputs. A remote attacker could send a specially crafted tftp request to […]

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AlmaLinux 8 — libvncserver — multiple vulnerabilities (6 CVEs) — patch and remediation guide — diagnosis and fix on AlmaLinux 8

AlmaLinux 8 — libvncserver — multiple vulnerabilities (6 CVEs) — patch and remediation guide

🟠 High   ⏱ 15–60 min  Last verified: 25 May 2026 Affected versions: AlmaLinux 8 📖 ~4 min read  •  Source: AlmaLinux ALSA ALSA-2020:3385 Related CVEs: CVE-2017-18922 CVE-2018-21247 CVE-2019-20839 CVE-2020-14397 CVE-2020-14405 CVE-2020-25708 Upstream summary: LibVNCServer is a C library that enables you to implement VNC server functionality into own programs. Security Fix(es): * libvncserver: websocket […]

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How to Install and Configure OpenVPN on RHEL 7 — step-by-step RHEL 7 tutorial on Progressive Robot

How to Install and Configure OpenVPN on RHEL 7

How to Install and Configure OpenVPN on RHEL 7 OpenVPN is one of the most widely deployed VPN solutions in the enterprise, valued for its flexibility, strong encryption, and compatibility across nearly every operating system. On RHEL 7, OpenVPN is not included in the base repositories but is available from EPEL. Building a proper PKI […]

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Oracle Linux 8 — ruby:2.7 security, bug fix, and — enhancement update — new behaviour and fixes — diagnosis and fix on Oracle Linux 8

Oracle Linux 8 — ruby:2.7 security, bug fix, and — enhancement update — new behaviour and fixes (ELSA-2021-2584)

🟡 Medium   ⏱ 10–30 min  Last verified: 6 December 2021 Affected versions: Oracle Linux 8 📖 ~4 min read  •  Source: ELSA advisory ELSA-2021-2584 Related CVEs: CVE-2020-25613 CVE-2021-28965 Table of contents Symptom & Impact Environment & Reproduction Root Cause Analysis Quick Triage Step-by-Step Diagnosis Solution – Primary Fix Solution – Alternative Approaches Verification & […]

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How to Set Up Fluentd on CentOS Stream 9 — step-by-step CentOS Stream 9 tutorial on Progressive Robot

How to Set Up Fluentd on CentOS Stream 9

Introduction How to Set Up Fluentd on CentOS Stream 9 on CentOS Stream 9 provides administrators with a robust, enterprise-ready workflow that integrates cleanly with systemd, SELinux, firewalld, and the modern AppStream module system. In this tutorial we will walk through every step required, from package installation to verification, so that the resulting configuration is […]

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How to Configure Chef Client on IBM AIX 7.1 — step-by-step IBM AIX 7.1 tutorial on Progressive Robot

How to Configure Chef Client on IBM AIX 7.1

Introduction IBM AIX 7.1 is the latest release of IBM’s enterprise-grade UNIX operating system, running on IBM Power Systems hardware. Known for its reliability, security, and performance in mission-critical environments, AIX 7.1 introduces enhanced virtualization, security hardening, and cloud integration features. This guide covers how to configure chef client on ibm aix 7.1 on IBM […]

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FreeBSD 13 — py311-kerberos — vulnerability — patch and remediation guide — diagnosis and fix on FreeBSD 13

FreeBSD 13 — py311-kerberos — vulnerability — patch and remediation guide

🟢 Low   ⏱ 5–15 min  Last verified: 6 December 2021 Affected versions: FreeBSD 13 📖 ~4 min read  •  Source: FreeBSD VuXML VuXML topic: py-kerberos — DoS and MitM vulnerabilities Related CVEs: CVE-2015-3206 Upstream summary: macosforgebot reports: The checkPassword function in python-kerberos does not authenticate the KDC it attempts to communicate with, which allows […]

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How to Set Up Galera Cluster for MariaDB on SLES 12 — step-by-step SUSE Linux Enterprise 12 tutorial on Progressive Robot

How to Set Up Galera Cluster for MariaDB on SLES 12

Introduction This tutorial covers How to Set Up Galera Cluster for MariaDB on SLES 12 on SLES 12. SLES 12 (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 12 system is up to […]

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

AlmaLinux 8 — osbuild — 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-2022:1804 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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