Common Problems

Oracle Linux 8 — kernel — security and stability fixes — required update (ELSA-2020-5473)

• November 28, 2020
• Linux
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🟡 Medium   ⏱ 10–30 min  Last verified: 28 November 2020 Affected versions: Oracle Linux 8 📖 ~4 min read  •  Source: ELSA advisory ELSA-2020-5473 Related CVEs: CVE-2020-16166 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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Legacy service Command Fails for SysV Script on RHEL 7

• November 28, 2020
• Tutorials
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🟡 Medium   ⏱ 5–30 min  Last verified: 28 November 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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Windows Server 2019 — Netlogon service breaks secure channel with PDC emulator — Fix & Prevention

• November 28, 2020
• FreeBSD
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🟠 High   ⏱ 5–30 min  Last verified: 28 November 2020 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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Windows Server 2019 — Post-Update Boot Loop Triggered by Incompatible Storage Driver — Fix & Prevention

• November 28, 2020
• Tutorials
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🟠 High   ⏱ 5–30 min  Last verified: 28 November 2020 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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SLES 15 — go1.13 — multiple vulnerabilities (4 CVEs) — patch and remediation guide

• November 28, 2020
• Linux
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🟠 High   ⏱ 15–60 min  Last verified: 28 November 2020 Affected versions: SLES 15 📖 ~4 min read  •  Source: SUSE security advisory (see also SUSE bugzilla) Related CVEs: CVE-2020-7919 CVE-2020-15586 CVE-2020-14039 CVE-2020-16845 Upstream summary: Go before 1.12.16 and 1.13.x before 1.13.7 (and the crypto/cryptobyte package before 0.0.0-20200124225646-8b5121be2f68 for Go) allows attacks on clients […]

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Oracle Linux 8 — json-c — security and stability fixes — required update (ELSA-2021-4382)

• November 27, 2020
• Linux
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🟡 Medium   ⏱ 10–30 min  Last verified: 27 November 2020 Affected versions: Oracle Linux 8 📖 ~4 min read  •  Source: ELSA advisory ELSA-2021-4382 Related CVEs: CVE-2020-12762 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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RHEL 7 Cron Job Runs but Script Fails Under SELinux

• November 27, 2020
• Linux
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🟡 Medium   ⏱ 5–30 min  Last verified: 27 November 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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openSUSE Tumbleweed — kitty — multiple vulnerabilities (2 CVEs) — patch and remediation guide

• November 27, 2020
• Linux
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🔴 Critical   ⏱ 15–90 min  Last verified: 25 May 2026 Affected versions: openSUSE Tumbleweed 📖 ~4 min read  •  Source: SUSE advisory openSUSE-SU-2021:0025-1 (see also SUSE bugzilla) Related CVEs: CVE-2020-35605 CVE-2008-2383 Upstream summary: The Graphics Protocol feature in graphics.c in kitty before 0.19.3 allows remote attackers to execute arbitrary code because a filename containing […]

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systemd-resolved Not Used and DNS Queries Intermittently Fail

• November 27, 2020
• Tutorials
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🟡 Medium   ⏱ 5–30 min  Last verified: 27 November 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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FreeBSD 12 — rubygem-websocket-extensions — vulnerability — patch and remediation guide

• November 27, 2020
• BSD
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🟢 Low   ⏱ 5–15 min  Last verified: 27 November 2020 Affected versions: FreeBSD 12 📖 ~4 min read  •  Source: FreeBSD VuXML VuXML topic: websocket-extensions — ReDoS vulnerability Related CVEs: CVE-2020-7663 Upstream summary: Changelog: Remove a ReDoS vulnerability in the header parser (CVE-2020-7663) Table of contents Symptom & Impact Environment & Reproduction Root Cause […]

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