Security Hardening

Ubuntu 20.04 — neomutt — multiple vulnerabilities (20 CVEs) — patch and remediation guide — diagnosis and fix on Ubuntu 20.04

Ubuntu 20.04 — neomutt — multiple vulnerabilities (20 CVEs) — patch and remediation guide

  • November 23, 2020
  • Linux
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🟠 High   ⏱ 15–60 min  Last verified: 23 November 2020 Affected versions: Ubuntu 20.04 (focal) 📖 ~4 min read  •  Source: Ubuntu Security Notice USN-7204-1 Related CVEs: CVE-2018-14349 CVE-2018-14350 CVE-2018-14351 CVE-2018-14352 CVE-2018-14353 CVE-2018-14354 CVE-2018-14355 CVE-2018-14356  +12 more Upstream summary: Jeriko One discovered that NeoMutt incorrectly handled certain IMAP and POP3 responses. An attacker could […]

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SLES 15 — grafana-piechart-panel — vulnerability — patch and remediation guide — diagnosis and fix on SLES 15

SLES 15 — grafana-piechart-panel — vulnerability — patch and remediation guide

  • November 23, 2020
  • Linux
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🟡 Medium   ⏱ 10–30 min  Last verified: 23 November 2020 Affected versions: SLES 15 📖 ~4 min read  •  Source: SUSE advisory SUSE-CU-2021:601-1 (see also SUSE bugzilla) Related CVEs: CVE-2020-13429 Upstream summary: legend.ts in the piechart-panel (aka Pie Chart Panel) plugin before 1.5.0 for Grafana allows XSS via the Values Header (aka legend header) […]

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How to Manage Users and Groups on SLES 15 — step-by-step SUSE Linux Enterprise 15 tutorial on Progressive Robot

How to Manage Users and Groups on SLES 15

Introduction This tutorial covers How to Manage Users and Groups 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: zypper […]

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Alpine Linux edge — postsrsd — vulnerability — patch and remediation guide — diagnosis and fix on Alpine Linux edge

Alpine Linux edge — postsrsd — vulnerability — patch and remediation guide

  • November 23, 2020
  • Linux
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🟡 Medium   ⏱ 10–30 min  Last verified: 25 May 2026 Affected versions: Alpine Linux edge / fixed in 1.6-r4 📖 ~4 min read  •  Source: Alpine secdb entry — postsrsd 1.6-r4 Related CVEs: CVE-2020-35573 Upstream summary: Alpine community repository for vedge ships postsrsd 1.6-r4 which addresses CVE-2020-35573. Table of contents Symptom & Impact Environment […]

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Oracle Linux 8 — bluez — vulnerability — patch and remediation guide — diagnosis and fix on Oracle Linux 8

Oracle Linux 8 — bluez — vulnerability — patch and remediation guide (ELSA-2021-1598)

  • November 23, 2020
  • Linux
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🟡 Medium   ⏱ 10–30 min  Last verified: 23 November 2020 Affected versions: Oracle Linux 8 📖 ~4 min read  •  Source: ELSA advisory ELSA-2021-1598 Related CVEs: CVE-2020-27153 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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Debian 10 — tcpdump — vulnerability — patch and remediation guide — diagnosis and fix on Debian 10

Debian 10 — tcpdump — vulnerability — patch and remediation guide

  • November 23, 2020
  • Linux
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🟢 Low   ⏱ 5–15 min  Last verified: 23 November 2020 Affected versions: Debian 10 (buster) 📖 ~4 min read  •  Source: Debian Security Tracker Related CVEs: CVE-2018-10103 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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Initial Server Setup with Oracle Linux 8 — step-by-step Oracle Linux 8 tutorial on Progressive Robot

Initial Server Setup with Oracle Linux 8

Introduction This tutorial demonstrates initial Server Setup with Oracle Linux 8 on Oracle Linux 8. It is written for administrators who want a repeatable, well-explained walkthrough that goes beyond a bare command list and explains each configuration choice. Every command is tested against a freshly registered Oracle Linux 8 system with the default AppStream repositories […]

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

Oracle Linux 8 — systemd — security and stability fixes — required update (ELSA-2023-0837)

  • November 22, 2020
  • Linux
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🟡 Medium   ⏱ 10–30 min  Last verified: 22 November 2020 Affected versions: Oracle Linux 8 📖 ~4 min read  •  Source: ELSA advisory ELSA-2023-0837 Related CVEs: CVE-2022-4415 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 121688

LDAP Authentication Slow or Timing Out

🟡 Medium   ⏱ 5–30 min  Last verified: 22 November 2020 Affected versions: Debian 9 📖 ~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 & […]

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How to Configure Prometheus Alerting Rules on Oracle Linux 8 — step-by-step Oracle Linux 8 tutorial on Progressive Robot

How to Configure Prometheus Alerting Rules on Oracle Linux 8

Introduction Setting up configure prometheus alerting rules on oracle linux 8 on a Oracle Linux 8 server is a common task for system administrators, DevOps engineers, and site reliability engineers. This guide explains how to Configure Prometheus Alerting Rules on Oracle Linux 8, with all the commands you need, the SELinux and firewalld considerations to […]

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