Troubleshooting

FreeBSD 12 — py37-Flask-Cors — vulnerability — patch and remediation guide — diagnosis and fix on FreeBSD 12

FreeBSD 12 — py37-Flask-Cors — vulnerability — patch and remediation guide

🟢 Low   ⏱ 5–15 min  Last verified: 22 March 2020 Affected versions: FreeBSD 12 📖 ~4 min read  •  Source: FreeBSD VuXML VuXML topic: py-Flask-Cors — directory traversal vulnerability Related CVEs: CVE-2020-25032 Upstream summary: praetorian-colby-morgan reports: An issue was discovered in Flask-CORS (aka CORS Middleware for Flask) before 3.0.9. It allows ../ directory traversal […]

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How to Set Up Failover Clustering on Windows Server 2019 — step-by-step Windows Server 2019 tutorial on Progressive Robot

How to Set Up Failover Clustering on Windows Server 2019

How to Set Up Failover Clustering on Windows Server 2019 Failover Clustering in Windows Server 2019 provides high availability for server roles and Hyper-V virtual machines by grouping multiple servers into a cluster. If one node fails, cluster roles automatically start on another surviving node with minimal downtime. Windows Server 2019 improves upon previous versions […]

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Debian 10 — dnsmasq — vulnerability — patch and remediation guide — diagnosis and fix on Debian 10

Debian 10 — dnsmasq — vulnerability — patch and remediation guide

🟢 Low   ⏱ 5–15 min  Last verified: 22 March 2020 Affected versions: Debian 10 (buster) 📖 ~4 min read  •  Source: Debian Security Tracker Related CVEs: CVE-2020-25681 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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openSUSE Tumbleweed — argyllcms — vulnerability — patch and remediation guide — diagnosis and fix on openSUSE Tumbleweed

openSUSE Tumbleweed — argyllcms — vulnerability — patch and remediation guide

🟡 Medium   ⏱ 10–30 min  Last verified: 25 May 2026 Affected versions: openSUSE Tumbleweed 📖 ~4 min read  •  Source: SUSE security advisory (see also SUSE bugzilla) Related CVEs: CVE-2012-1616 Upstream summary: Use-after-free vulnerability in icclib before 2.13, as used by Argyll CMS before 1.4 and possibly other programs, allows remote attackers to cause […]

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Oracle Linux 8 — tcpdump — vulnerability — patch and remediation guide — diagnosis and fix on Oracle Linux 8

Oracle Linux 8 — tcpdump — vulnerability — patch and remediation guide (ELSA-2020-1604)

🟢 Low   ⏱ 5–15 min  Last verified: 22 March 2020 Affected versions: Oracle Linux 8 📖 ~4 min read  •  Source: ELSA advisory ELSA-2020-1604 Related CVEs: CVE-2018-19519 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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FreeBSD 12 — xwayland — multiple vulnerabilities (20 CVEs) — patch and remediation guide — diagnosis and fix on FreeBSD 12

FreeBSD 12 — xwayland — multiple vulnerabilities (20 CVEs) — patch and remediation guide

🟠 High   ⏱ 15–60 min  Last verified: 22 March 2020 Affected versions: FreeBSD 12 📖 ~4 min read  •  Source: FreeBSD VuXML VuXML topic: xwayland — Multiple vulnerabilities Related CVEs: CVE-2017-12176 CVE-2017-12177 CVE-2017-12178 CVE-2017-12179 CVE-2017-12180 CVE-2017-12181 CVE-2017-12182 CVE-2017-12183  +12 more Upstream summary: X.Org project reports: Multiple issues have been found in the X server […]

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How to Use Docker Secrets and Environment Variables Securely on RHEL 7 — step-by-step RHEL 7 tutorial on Progressive Robot

How to Use Docker Secrets and Environment Variables Securely on RHEL 7

How to Use Docker Secrets and Environment Variables Securely on RHEL 7 One of the most common security mistakes in containerised deployments is embedding sensitive values — database passwords, API keys, TLS certificates — directly inside Dockerfiles or baking them into image layers. Because Docker images are built as a stack of read-only layers, anything […]

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Arch Linux — openvpn — multiple vulnerabilities (8 CVEs) — patch and remediation guide — diagnosis and fix on Arch Linux

Arch Linux — openvpn — multiple vulnerabilities (8 CVEs) — patch and remediation guide

🔴 Critical   ⏱ 15–90 min  Last verified: 25 May 2026 Affected versions: Arch Linux (rolling release) 📖 ~4 min read  •  Source: Arch ASA ASA-201706-27 Related CVEs: CVE-2017-7521 CVE-2017-7520 CVE-2017-7512 CVE-2017-7508 CVE-2017-7479 CVE-2017-7478 CVE-2020-11810 CVE-2017-12166 Upstream summary: Type: multiple issues. Status: Fixed. Affected: 2.4.2-1. Fixed in: 2.4.3-1. Group: AVG-318. Table of contents Symptom & […]

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Common Problems 121082

Debian 10 – UFW policy blocks package downloads and outbound HTTPS

🟡 Medium   ⏱ 5–30 min  Last verified: 21 March 2020 Affected versions: Debian 10 📖 ~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 — junkbuster — multiple vulnerabilities (2 CVEs) — patch and remediation guide — diagnosis and fix on FreeBSD 12

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

🟢 Low   ⏱ 5–15 min  Last verified: 21 March 2020 Affected versions: FreeBSD 12 📖 ~4 min read  •  Source: FreeBSD VuXML VuXML topic: junkbuster — heap corruption vulnerability and configuration modification vulnerability Related CVEs: CVE-2005-1108 CVE-2005-1109 Upstream summary: A Debian advisory reports: James Ranson discovered that an attacker can modify the referrer setting […]

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CHAT