Common Problems

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

Oracle Linux 8 — dovecot — security and stability fixes — required update (ELSA-2019-3467)

🟡 Medium   ⏱ 10–30 min  Last verified: 10 January 2021 Affected versions: Oracle Linux 8 📖 ~4 min read  •  Source: ELSA advisory ELSA-2019-3467 Related CVEs: CVE-2019-3814 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 115633

SELinux and firewalld Both Correct but App Still Unreachable

🟡 Medium   ⏱ 5–30 min  Last verified: 10 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 113437

Windows Server 2012 R2 — MSU update package fails to install with hash mismatch corrupt error — Fix & Prevention

🟠 High   ⏱ 5–30 min  Last verified: 10 January 2021 Affected versions: Windows Server 2012 R2 📖 ~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 […]

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Common Problems 112409

Windows Server 2019 — Domain trust relationship breaks after VM snapshot restore — Fix & Prevention

🟡 Medium   ⏱ 5–30 min  Last verified: 10 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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FreeBSD 12 — x11vnc — multiple vulnerabilities (2 CVEs) — patch and remediation guide — diagnosis and fix on FreeBSD 12

FreeBSD 12 — x11vnc — multiple vulnerabilities (2 CVEs) — patch and remediation guide

🟢 Low   ⏱ 5–15 min  Last verified: 9 January 2021 Affected versions: FreeBSD 12 📖 ~4 min read  •  Source: FreeBSD VuXML VuXML topic: x11vnc — access to shared memory segments Related CVEs: CVE-2006-2450 CVE-2020-29074 Upstream summary: [email protected] reports: scan.c in x11vnc 0.9.16 uses IPC_CREAT|0777 in shmget calls, which allows access by actors other […]

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

Oracle Linux 8 — kernel — security and stability fixes — required update (ELSA-2020-0339)

🟠 High   ⏱ 15–60 min  Last verified: 9 January 2021 Affected versions: Oracle Linux 8 📖 ~4 min read  •  Source: ELSA advisory ELSA-2020-0339 Related CVEs: CVE-2019-14814 CVE-2019-14816 CVE-2019-14898 CVE-2019-14895 CVE-2019-17666 CVE-2019-19338 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 119106

Ubuntu 14.04 LTS – NFS mounts timeout during boot and delay services – Fix & Prevention

🟡 Medium   ⏱ 5–30 min  Last verified: 9 January 2021 Affected versions: Ubuntu 14.04 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 113589

Windows Server 2012 R2 – Just-in-Time admin elevation fails through PAM workflows – Fix & Prevention

🟠 High   ⏱ 5–30 min  Last verified: 9 January 2021 Affected versions: Windows Server 2012 R2 📖 ~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 […]

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Common Problems 112915

Windows Server 2016 – Kerberos KRB_AP_ERR_MODIFIED and SPN duplication – Fix & Prevention

🟠 High   ⏱ 5–30 min  Last verified: 9 January 2021 Affected versions: Windows Server 2016 📖 ~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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Ubuntu 20.04 — influxdb — vulnerability — patch and remediation guide — diagnosis and fix on Ubuntu 20.04

Ubuntu 20.04 — influxdb — vulnerability — patch and remediation guide

🟢 Low   ⏱ 5–15 min  Last verified: 9 January 2021 Affected versions: Ubuntu 20.04 (focal) 📖 ~4 min read  •  Source: Ubuntu Security Notice USN-5451-1 Related CVEs: CVE-2019-20933 Upstream summary: Ilya Averyanov discovered that an InfluxDB vulnerability allowed attackers to bypass authentication and gain access to any known database user. Table of contents Symptom […]

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