Oracle Linux 8 — Unbreakable Enterprise kernel — vulnerability — patch and remediation guide — diagnosis and fix on Oracle Linux 8

Oracle Linux 8 — Unbreakable Enterprise kernel — vulnerability — patch and remediation guide (ELSA-2020-5805)

January 26, 2021
Linux
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🟠 High ⏱ 15–60 min Last verified: 26 January 2021 Affected versions: Oracle Linux 8 📖 ~4 min read • Source: ELSA advisory ELSA-2020-5805 Related CVEs: CVE-2019-19054 CVE-2019-19462 CVE-2020-10768 CVE-2020-10767 CVE-2020-10732 CVE-2020-12888 Table of contents Symptom & Impact Environment & Reproduction Root Cause Analysis Quick Triage Step-by-Step Diagnosis Solution – Primary Fix Solution – […]

Arch Linux — ruby-addressable — vulnerability — patch and remediation guide

January 26, 2021
Linux
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🟡 Medium ⏱ 10–30 min Last verified: 25 May 2026 Affected versions: Arch Linux (rolling release) 📖 ~4 min read • Source: Arch ASA ASA-202107-19 Related CVEs: CVE-2021-32740 Upstream summary: Type: denial of service. Status: Fixed. Affected: 2.7.0-3. Fixed in: 2.8.0-1. Group: AVG-2136. Table of contents Symptom & Impact Environment & Reproduction Root Cause […]

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

Oracle Linux 8 — nss — security and stability fixes — required update (ELSA-2021-0538)

January 25, 2021
Linux
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🟡 Medium ⏱ 10–30 min Last verified: 25 January 2021 Affected versions: Oracle Linux 8 📖 ~4 min read • Source: ELSA advisory ELSA-2021-0538 Related CVEs: CVE-2020-6829 CVE-2020-12400 CVE-2020-12403 Table of contents Symptom & Impact Environment & Reproduction Root Cause Analysis Quick Triage Step-by-Step Diagnosis Solution – Primary Fix Solution – Alternative Approaches Verification […]

Debian 9 – boot is delayed by systemd-networkd-wait-online timeout

January 25, 2021
Linux
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🟡 Medium ⏱ 5–30 min Last verified: 25 January 2021 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 & […]

sudo: unable to resolve host

January 25, 2021
Tutorials
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🟡 Medium ⏱ 5–30 min Last verified: 25 January 2021 📖 ~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 […]

Windows Server 2019 — Group Policy firewall settings block SMB administration traffic — Fix & Prevention

January 25, 2021
Tutorials
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🟠 High ⏱ 5–30 min Last verified: 25 January 2021 Affected versions: Windows Server 2019 📖 ~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 […]

Arch Linux — tar — multiple vulnerabilities (3 CVEs) — patch and remediation guide

January 25, 2021
Linux
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🟡 Medium ⏱ 10–30 min Last verified: 25 May 2026 Affected versions: Arch Linux (rolling release) 📖 ~4 min read • Source: Arch ASA ASA-201611-11 Related CVEs: CVE-2016-6321 CVE-2021-20193 CVE-2018-20482 Upstream summary: Type: arbitrary file overwrite. Status: Fixed. Affected: 1.29-1. Fixed in: 1.29-2. Group: AVG-64. Table of contents Symptom & Impact Environment & Reproduction […]

How to Configure AlertManager on SLES 15

January 25, 2021
SUSE Linux Enterprise
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Introduction This tutorial covers How to Configure AlertManager 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 refresh && […]

IBM AIX 7.2 — CVE-2021-29833 — xss — patch and remediation guide

January 25, 2021
Tutorials
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🟡 Medium ⏱ 15–45 min Last verified: 25 January 2021 Affected versions: IBM AIX 7.2 📖 ~4 min read • Source: NVD CVE-2021-29833, IBM Support Bulletin CVE: CVE-2021-29833 NVD summary: IBM Jazz for Service Management 1.1.3.10 and IBM Tivoli Netcool/OMNIbus_GUI is vulnerable to stored cross-site scripting. This vulnerability allows users to embed arbitrary JavaScript […]

Ubuntu 20.04 — python-rsa — vulnerability — patch and remediation guide

January 25, 2021
Linux
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🟢 Low ⏱ 5–15 min Last verified: 25 January 2021 Affected versions: Ubuntu 20.04 (focal) 📖 ~4 min read • Source: Ubuntu Security Notice USN-4478-2 Related CVEs: CVE-2020-13757 Upstream summary: USN-4478-1 fixed a vulnerability in Python-RSA. This update provides the corresponding update for Ubuntu 16.04 ESM, Ubuntu 18.04 ESM and Ubuntu 20.04 ESM. Original […]

Operations

Oracle Linux 8 — Unbreakable Enterprise kernel — vulnerability — patch and remediation guide (ELSA-2020-5805)

Arch Linux — ruby-addressable — vulnerability — patch and remediation guide

Oracle Linux 8 — nss — security and stability fixes — required update (ELSA-2021-0538)

Debian 9 – boot is delayed by systemd-networkd-wait-online timeout

sudo: unable to resolve host

Windows Server 2019 — Group Policy firewall settings block SMB administration traffic — Fix & Prevention

Arch Linux — tar — multiple vulnerabilities (3 CVEs) — patch and remediation guide

How to Configure AlertManager on SLES 15

IBM AIX 7.2 — CVE-2021-29833 — xss — patch and remediation guide

Ubuntu 20.04 — python-rsa — vulnerability — patch and remediation guide

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