April 2021 - Page 42 of 62

How To Protect SSH with fail2ban on CentOS 6 — step-by-step Linux tutorial on Progressive Robot

How To Protect SSH with fail2ban on CentOS 6

fail2ban provides a way to automatically protect virtual servers from malicious behavior. This tutorial shows you how to download the required EPEL repository needed to install Fail2Ban, copy the Configuration File, configure the fail2ban defaults, and configure the ssh defaults. This tutorial describes the required steps to set up fail2ban on CentOS.

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FreeBSD 12 — ImageMagick7-nox — multiple vulnerabilities (20 CVEs) — patch and remediation guide — diagnosis and fix on FreeBSD 12

FreeBSD 12 — ImageMagick7-nox — multiple vulnerabilities (20 CVEs) — patch and remediation guide

🟠 High   ⏱ 15–60 min  Last verified: 11 April 2021 Affected versions: FreeBSD 12 📖 ~4 min read  •  Source: FreeBSD VuXML VuXML topic: ImageMagick7 — multiple vulnerabilities Related CVEs: CVE-2016-3714 CVE-2016-3715 CVE-2016-3716 CVE-2016-3717 CVE-2016-3718 CVE-2016-8862 CVE-2016-8866 CVE-2016-9298  +12 more Upstream summary: CVE reports: Several vulnerabilities have been discovered in ImageMagick: CVE-2021-20313: A flaw […]

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Amazon Linux 2 — kernel-livepatch-4.14.165-131.185 — multiple vulnerabilities (5 CVEs) — patch and remediation guide — diagnosis and fix on Amazon Linux 2

Amazon Linux 2 — kernel-livepatch-4.14.165-131.185 — multiple vulnerabilities (5 CVEs) — patch and remediation guide

🟠 High   ⏱ 15–60 min  Last verified: 25 May 2026 Affected versions: Amazon Linux 2 📖 ~4 min read  •  Source: Amazon Linux advisory ALAS2LIVEPATCH-2020-001 Related CVEs: CVE-2019-1591 CVE-2019-15918 CVE-2020-10942 CVE-2020-8648 CVE-2019-20096 Upstream summary: An issue was discovered in the Linux kernel before 5.0.10. SMB2_negotiate in fs/cifs/smb2pdu.c has an out-of-bounds read because data structures […]

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How To Implement PHP Rate Limiting with Redis on Ubuntu 20.04 — step-by-step Linux tutorial on Progressive Robot

How To Implement PHP Rate Limiting with Redis on Ubuntu 20.04

Redis (Remote Dictionary Server ) is an in-memory open source software. It is a data-structure store that uses a server’s RAM, which is several times faster than even the fastest Solid State Drive (SSD). This makes Redis highly responsive, and therefore, suitable for rate limiting. In this tutorial, you’ll implement a PHP script for rate limiting with Redis on an Ubuntu 20.04 server.

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How to Configure iSCSI Initiator for SAN Access on Windows Server 2016 — step-by-step Windows Server 2016 tutorial on Progressive Robot

How to Configure iSCSI Initiator for SAN Access on Windows Server 2016

How to Set Up iSCSI Initiator to Connect to SAN Storage on Windows Server 2016 iSCSI (Internet Small Computer Systems Interface) is a protocol that allows servers to access block-level storage devices over standard TCP/IP networks. Instead of requiring expensive Fibre Channel infrastructure, iSCSI enables Storage Area Network (SAN) connectivity over ordinary Ethernet, making enterprise-class […]

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Oracle Linux 8 — ruby:3.1 security, bug fix, and — enhancement update — new behaviour and fixes — diagnosis and fix on Oracle Linux 8

Oracle Linux 8 — ruby:3.1 security, bug fix, and — enhancement update — new behaviour and fixes (ELSA-2024-1431)

🟡 Medium   ⏱ 10–30 min  Last verified: 10 April 2021 Affected versions: Oracle Linux 8 📖 ~4 min read  •  Source: ELSA advisory ELSA-2024-1431 Related CVEs: CVE-2023-28756 CVE-2023-28755 CVE-2021-33621 CVE-2023-36617 Table of contents Symptom & Impact Environment & Reproduction Root Cause Analysis Quick Triage Step-by-Step Diagnosis Solution – Primary Fix Solution – Alternative Approaches […]

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Gentoo Linux — app-admin/vault — multiple vulnerabilities (13 CVEs) — patch and remediation guide — diagnosis and fix on Gentoo Linux

Gentoo Linux — app-admin/vault — multiple vulnerabilities (13 CVEs) — patch and remediation guide

🟢 Low   ⏱ 5–15 min  Last verified: 25 May 2026 Affected versions: Gentoo Linux 📖 ~4 min read  •  Source: Gentoo GLSA GLSA-202207-01 Related CVEs: CVE-2020-25594 CVE-2021-27668 CVE-2021-3024 CVE-2021-3282 CVE-2021-32923 CVE-2021-37219 CVE-2021-38553 CVE-2021-38554  +5 more Upstream summary: Multiple vulnerabilities have been discovered in HashiCorp Vault. Please review the CVE identifiers referenced below for details. […]

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Common Problems 119150

Ubuntu 14.04 LTS Redis service refuses connections due to overcommit settings

🟡 Medium   ⏱ 5–30 min  Last verified: 10 April 2021 Affected versions: 14.04 📖 ~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 […]

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How to Configure Jaeger Distributed Tracing on Oracle Linux 8 — step-by-step Oracle Linux 8 tutorial on Progressive Robot

How to Configure Jaeger Distributed Tracing on Oracle Linux 8

Introduction Oracle Linux 8 ships with a stable, security-hardened base that makes deploying configure jaeger distributed tracing on oracle linux 8 both straightforward and auditable. This tutorial covers the complete procedure for how to Configure Jaeger Distributed Tracing on Oracle Linux 8, including dnf module streams where applicable, systemd unit management, and the firewalld rules […]

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