February 2021

Alpine Linux edge — opendmarc — vulnerability — patch and remediation guide — diagnosis and fix on Alpine Linux edge

Alpine Linux edge — opendmarc — vulnerability — patch and remediation guide

🟡 Medium   ⏱ 10–30 min  Last verified: 25 May 2026 Affected versions: Alpine Linux edge / fixed in 1.4.1.1-r3 📖 ~4 min read  •  Source: Alpine secdb entry — opendmarc 1.4.1.1-r3 Related CVEs: CVE-2021-34555 Upstream summary: Alpine community repository for vedge ships opendmarc 1.4.1.1-r3 which addresses CVE-2021-34555. Table of contents Symptom & Impact Environment […]

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

Oracle Linux 8 — rsyslog security, bug fix, and — enhancement update — new behaviour and fixes (ELSA-2020-1702)

🟡 Medium   ⏱ 10–30 min  Last verified: 25 May 2026 Affected versions: Oracle Linux 8 📖 ~4 min read  •  Source: ELSA advisory ELSA-2020-1702 Related CVEs: CVE-2019-17041 CVE-2019-17042 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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Alpine Linux edge — libexif — multiple vulnerabilities (20 CVEs) — patch and remediation guide — diagnosis and fix on Alpine Linux edge

Alpine Linux edge — libexif — multiple vulnerabilities (20 CVEs) — patch and remediation guide

🟠 High   ⏱ 15–60 min  Last verified: 25 May 2026 Affected versions: Alpine Linux edge / fixed in 0.6.23-r0 📖 ~4 min read  •  Source: Alpine secdb entry — libexif 0.6.23-r0 Related CVEs: CVE-2020-0198 CVE-2020-0452 CVE-2018-20030 CVE-2020-13114 CVE-2020-13113 CVE-2020-13112 CVE-2020-0093 CVE-2019-9278  +12 more Upstream summary: Alpine community repository for vedge ships libexif 0.6.23-r0 which […]

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Common Problems 115542

MariaDB fails to start after crash

🟡 Medium   ⏱ 5–30 min  Last verified: 20 May 2026 📖 ~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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How to Configure HashiCorp Vault on SLES 12 — step-by-step SUSE Linux Enterprise 12 tutorial on Progressive Robot

How to Configure HashiCorp Vault on SLES 12

Introduction This tutorial covers How to Configure HashiCorp Vault on SLES 12 on SLES 12. SLES 12 (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 12 system is up to date: zypper refresh […]

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Common Problems 113459

Windows Server 2012 R2 – AppLocker rule conflict blocking legitimate apps – Fix & Prevention

🟠 High   ⏱ 5–30 min  Last verified: 01 April 2027 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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FreeBSD 12 — py35-wagtail — multiple vulnerabilities (2 CVEs) — patch and remediation guide — diagnosis and fix on FreeBSD 12

FreeBSD 12 — py35-wagtail — multiple vulnerabilities (2 CVEs) — patch and remediation guide

🟢 Low   ⏱ 5–15 min  Last verified: 25 May 2026 Affected versions: FreeBSD 12 📖 ~4 min read  •  Source: FreeBSD VuXML VuXML topic: Wagtail — potential timing attack vulnerability Related CVEs: CVE-2020-11001 CVE-2020-11037 Upstream summary: Wagtail release notes: CVE-2020-11037: Potential timing attack on password-protected private pages This release addresses a potential timing attack […]

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What is a Firewall and How Does It Work? — step-by-step Security tutorial on Progressive Robot

What is a Firewall and How Does It Work?

A firewall is a system that provides network security by filtering incoming and outgoing network traffic based on a set of user-defined rules. In general, the purpose of a firewall is to reduce or eliminate the occurrence of unwanted network communications while allowing all legitimate communication to flow freely. In most server infrastructures, firewalls provide an essential layer of security that, combined with other measures, prevent attackers from accessing your servers in malicious ways.

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FreeBSD 12 — mpd — multiple vulnerabilities (2 CVEs) — patch and remediation guide — diagnosis and fix on FreeBSD 12

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

🟢 Low   ⏱ 5–15 min  Last verified: 25 May 2026 Affected versions: FreeBSD 12 📖 ~4 min read  •  Source: FreeBSD VuXML VuXML topic: MPD5 PPPoE Server remotely exploitable crash Related CVEs: CVE-2020-7465 CVE-2020-7466 Upstream summary: Version 5.9_2 contains security fix for PPPoE servers. Insufficient validation of incoming PPPoE Discovery request specially crafted by […]

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