Common Problems

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)

🟡 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 […]

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Common Problems 121514

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

🟡 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 & […]

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Common Problems 118518

sudo: unable to resolve host

🟡 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 […]

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Common Problems 112479

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

🟠 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 […]

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

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

🟡 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 […]

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

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

🟡 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 […]

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Ubuntu 20.04 — python-rsa — vulnerability — patch and remediation guide — diagnosis and fix on Ubuntu 20.04

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

🟢 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 […]

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Ubuntu 16.04 — horizon — vulnerability — patch and remediation guide — diagnosis and fix on Ubuntu 16.04

Ubuntu 16.04 — horizon — vulnerability — patch and remediation guide

🟢 Low   ⏱ 5–15 min  Last verified: 25 January 2021 Affected versions: Ubuntu 16.04 (xenial) 📖 ~4 min read  •  Source: Ubuntu Security Notice USN-4675-1 Related CVEs: CVE-2020-29565 Upstream summary: Pritam Singh discovered that OpenStack Horizon incorrectly validated certain parameters. An attacker could possibly use this issue to cause OpenStack Horizon to redirect to […]

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Arch Linux — docker — multiple vulnerabilities (3 CVEs) — patch and remediation guide — diagnosis and fix on Arch Linux

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

🟠 High   ⏱ 15–60 min  Last verified: 25 May 2026 Affected versions: Arch Linux (rolling release) 📖 ~4 min read  •  Source: Arch ASA ASA-201701-19 Related CVEs: CVE-2016-9962 CVE-2021-21285 CVE-2021-21284 Upstream summary: Type: privilege escalation. Status: Fixed. Affected: 1:1.12.5-1. Fixed in: 1:1.12.6-1. Group: AVG-133. Table of contents Symptom & Impact Environment & Reproduction Root […]

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Ubuntu 16.04 — adminer — multiple vulnerabilities (3 CVEs) — patch and remediation guide — diagnosis and fix on Ubuntu 16.04

Ubuntu 16.04 — adminer — multiple vulnerabilities (3 CVEs) — patch and remediation guide

🟡 Medium   ⏱ 10–30 min  Last verified: 25 January 2021 Affected versions: Ubuntu 16.04 (xenial) 📖 ~4 min read  •  Source: Ubuntu Security Notice USN-5271-1 Related CVEs: CVE-2020-35572 CVE-2021-21311 CVE-2021-29625 Upstream summary: It was discovered that Adminer did not escape data in the history parameter of the default URI. A remote attacker could possibly […]

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