Security Hardening

Ubuntu 18.04 — fastd — vulnerability — patch and remediation guide — diagnosis and fix on Ubuntu 18.04

Ubuntu 18.04 — fastd — vulnerability — patch and remediation guide

🟢 Low   ⏱ 5–15 min  Last verified: 21 December 2020 Affected versions: Ubuntu 18.04 (bionic) 📖 ~4 min read  •  Source: Ubuntu Security Notice USN-4718-1 Related CVEs: CVE-2020-27638 Upstream summary: It was discovered that fastd incorrectly handled certain packets. An attacker could possibly use this issue to cause a denial of service. Table of […]

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

Oracle Linux 8 — libarchive — vulnerability — patch and remediation guide (ELSA-2020-0271)

🟠 High   ⏱ 15–60 min  Last verified: 21 December 2020 Affected versions: Oracle Linux 8 📖 ~4 min read  •  Source: ELSA advisory ELSA-2020-0271 Related CVEs: CVE-2019-18408 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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How to Configure OpenVPN Server on FreeBSD 12 — step-by-step FreeBSD 12 tutorial on Progressive Robot

How to Configure OpenVPN Server on FreeBSD 12

Introduction FreeBSD 12 is a UNIX-derived operating system renowned for its network stack performance, ZFS integration, and Jail isolation primitives. Setting up configure openvpn server on freebsd 12 on FreeBSD 12 follows the rc.conf/service(8) paradigm rather than systemd, which means enabling a service and configuring its startup options are done differently from any Linux distribution. […]

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openSUSE Tumbleweed — python38-M2Crypto — vulnerability — patch and remediation guide — diagnosis and fix on openSUSE Tumbleweed

openSUSE Tumbleweed — python38-M2Crypto — vulnerability — patch and remediation guide

🟠 High   ⏱ 15–60 min  Last verified: 25 May 2026 Affected versions: openSUSE Tumbleweed 📖 ~4 min read  •  Source: SUSE advisory openSUSE-SU-2022:2562-1 (see also SUSE bugzilla) Related CVEs: CVE-2020-25657 Upstream summary: A flaw was found in all released versions of m2crypto, where they are vulnerable to Bleichenbacher timing attacks in the RSA decryption […]

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Oracle Linux 8 — nodejs:10 — vulnerability — patch and remediation guide — diagnosis and fix on Oracle Linux 8

Oracle Linux 8 — nodejs:10 — vulnerability — patch and remediation guide (ELSA-2021-0548)

🟡 Medium   ⏱ 10–30 min  Last verified: 21 December 2020 Affected versions: Oracle Linux 8 📖 ~4 min read  •  Source: ELSA advisory ELSA-2021-0548 Related CVEs: CVE-2020-8287 CVE-2020-7788 CVE-2020-15366 CVE-2020-8116 CVE-2020-7754 CVE-2020-15095 Table of contents Symptom & Impact Environment & Reproduction Root Cause Analysis Quick Triage Step-by-Step Diagnosis Solution – Primary Fix Solution – […]

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Oracle Linux 8 — webkit2gtk3 security, bug fix, and — enhancement update — new behaviour and fixes — diagnosis and fix on Oracle Linux 8

Oracle Linux 8 — webkit2gtk3 security, bug fix, and — enhancement update — new behaviour and fixes (ELSA-2022-1777)

🟡 Medium   ⏱ 10–30 min  Last verified: 20 December 2020 Affected versions: Oracle Linux 8 📖 ~4 min read  •  Source: ELSA advisory ELSA-2022-1777 Related CVEs: CVE-2021-30889 CVE-2022-22637 CVE-2021-30848 CVE-2021-30884 CVE-2021-30890 CVE-2021-30818 Table of contents Symptom & Impact Environment & Reproduction Root Cause Analysis Quick Triage Step-by-Step Diagnosis Solution – Primary Fix Solution – […]

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Common Problems 121559

Debian 9 Boot Stalls on Emergency Mode

🔴 Critical   ⏱ 5–30 min  Last verified: 20 December 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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SLES 12 — libspeex1 — vulnerability — patch and remediation guide — diagnosis and fix on SLES 12

SLES 12 — libspeex1 — vulnerability — patch and remediation guide

🟡 Medium   ⏱ 10–30 min  Last verified: 20 December 2020 Affected versions: SLES 12 📖 ~4 min read  •  Source: SUSE advisory SUSE-SU-2021:3858-1 (see also SUSE bugzilla) Related CVEs: CVE-2020-23903 Upstream summary: A Divide by Zero vulnerability in the function static int read_samples of Speex v1.2 allows attackers to cause a denial of service […]

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Common Problems 118571

Ubuntu 16.04 LTS – Docker daemon fails to start with overlay2 errors – Fix & Prevention

🟠 High   ⏱ 5–30 min  Last verified: 20 December 2020 Affected versions: Ubuntu 16.04 LTS 📖 ~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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Common Problems 115087

Kernel Panic Risk from Low /boot Free Space During Update

🟡 Medium   ⏱ 5–30 min  Last verified: 20 December 2020 📖 ~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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