Logging Monitoring

Amazon Linux 2 — kernel-livepatch-4.14.225-169.362 — vulnerability — patch and remediation guide — diagnosis and fix on Amazon Linux 2

Amazon Linux 2 — kernel-livepatch-4.14.225-169.362 — vulnerability — 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-2021-051 Related CVEs: CVE-2021-33034 Upstream summary: A use-after-free flaw was found in hci_send_acl in the bluetooth host controller interface (HCI) in Linux kernel, where a local attacker with an access […]

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How to Configure Suricata IDS/IPS on RHEL 8 — step-by-step RHEL 8 tutorial on Progressive Robot

How to Configure Suricata IDS/IPS on RHEL 8

Suricata is a high-performance, open-source network threat detection engine that can operate as an Intrusion Detection System (IDS) to alert on suspicious traffic, or as an Intrusion Prevention System (IPS) to actively block it. On RHEL 8, Suricata integrates naturally with firewalld‘s NFQUEUE target for inline packet inspection, and its Lua scripting and Eve JSON […]

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Oracle Linux 8 — Installer Automatically Enables Ethernet Over USB Network Interface During a PXE Installation — diagnosis and fix on Oracle Linux 8

Oracle Linux 8 — Installer Automatically Enables Ethernet Over USB Network Interface During a PXE Installation

🟠 High   ⏱ 5–30 min  Last verified: 27 May 2021 Affected versions: Oracle Linux 8 📖 ~4 min read  •  Source: Oracle Bug 31888490 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 […]

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How to Perform a Security Audit on FreeBSD 13 — step-by-step FreeBSD 13 tutorial on Progressive Robot

How to Perform a Security Audit on FreeBSD 13

Introduction Deploying perform a security audit on freebsd 13 on a FreeBSD 13 machine differs from Linux in several important ways: packages come from the FreeBSD Ports Collection or the binary pkg repository, services are registered in /etc/rc.conf via sysrc(8), and firewall rules are written in pf.conf(5) syntax. This tutorial stays entirely within the standard […]

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AlmaLinux 8 — jasper — multiple vulnerabilities (4 CVEs) — patch and remediation guide — diagnosis and fix on AlmaLinux 8

AlmaLinux 8 — jasper — multiple vulnerabilities (4 CVEs) — patch and remediation guide

🟡 Medium   ⏱ 10–30 min  Last verified: 25 May 2026 Affected versions: AlmaLinux 8 📖 ~4 min read  •  Source: AlmaLinux ALSA ALSA-2021:4235 Related CVEs: CVE-2020-27828 CVE-2021-26926 CVE-2021-26927 CVE-2021-3272 Upstream summary: JasPer is an implementation of Part 1 of the JPEG 2000 image compression standard. Security Fix(es): * jasper: Heap-based buffer overflow in cp_create() […]

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Common Problems 117518

Ubuntu 20.04 LTS – SSH login fails with Permission denied (publickey)

🟠 High   ⏱ 5–30 min  Last verified: 27 May 2021 Affected versions: Ubuntu 20.04 LTS Ubuntu 20.04 Ubuntu 20.04.6 📖 ~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 […]

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FreeBSD 13 — py33-radicale — multiple vulnerabilities (2 CVEs) — patch and remediation guide — diagnosis and fix on FreeBSD 13

FreeBSD 13 — py33-radicale — multiple vulnerabilities (2 CVEs) — patch and remediation guide

🟢 Low   ⏱ 5–15 min  Last verified: 27 May 2021 Affected versions: FreeBSD 13 📖 ~4 min read  •  Source: FreeBSD VuXML VuXML topic: radicale — multiple vulnerabilities Related CVEs: CVE-2015-8747 CVE-2015-8748 Upstream summary: Radicale reports: The multifilesystem backend allows access to arbitrary files on all platforms. Prevent regex injection in rights management. Table […]

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FreeBSD 13 — libxfce4gui — multiple vulnerabilities (2 CVEs) — patch and remediation guide — diagnosis and fix on FreeBSD 13

FreeBSD 13 — libxfce4gui — multiple vulnerabilities (2 CVEs) — patch and remediation guide

🟢 Low   ⏱ 5–15 min  Last verified: 27 May 2021 Affected versions: FreeBSD 13 📖 ~4 min read  •  Source: FreeBSD VuXML VuXML topic: xfce — multiple vulnerabilities Related CVEs: CVE-2007-6531 CVE-2007-6532 Upstream summary: Gentoo reports: A remote attacker could entice a user to install a specially crafted "rc" file to execute arbitrary code […]

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Alpine Linux edge — lz4 — multiple vulnerabilities (2 CVEs) — patch and remediation guide — diagnosis and fix on Alpine Linux edge

Alpine Linux edge — lz4 — multiple vulnerabilities (2 CVEs) — patch and remediation guide

🟡 Medium   ⏱ 10–30 min  Last verified: 25 May 2026 Affected versions: Alpine Linux edge / fixed in 1.9.3-r1 📖 ~4 min read  •  Source: Alpine secdb entry — lz4 1.9.3-r1 Related CVEs: CVE-2021-3520 CVE-2019-17543 Upstream summary: Alpine main repository for vedge ships lz4 1.9.3-r1 which addresses CVE-2021-3520. Table of contents Symptom & Impact […]

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