Security Hardening

Common Problems 117914

Ubuntu 18.04 no sound output on speakers or headset

🟡 Medium   ⏱ 5–30 min  Last verified: 12 September 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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Common Problems 113486

Windows Server 2012 R2 – Filesystem minifilter altitude conflict causes access denied spikes – Fix and Prevention

🟡 Medium   ⏱ 5–30 min  Last verified: 12 September 2020 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 112478

Windows Server 2019 — SoftwareDistribution Corruption Causes Endless Update Retry Loop — Fix & Prevention

🟡 Medium   ⏱ 5–30 min  Last verified: 12 September 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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How to Set Up Cron Jobs and Scheduled Tasks on Debian 10 — step-by-step Debian 10 tutorial on Progressive Robot

How to Set Up Cron Jobs and Scheduled Tasks on Debian 10

Introduction Debian 10 Buster is built around the ethos of stability and free software. Setting up set up cron jobs and scheduled tasks on debian 10 on Buster leverages the same proven Debian packaging system that powers millions of servers worldwide, while benefiting from the latest upstream releases included in the Buster freeze. Follow each […]

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Ubuntu 16.04 — sane-backends — multiple vulnerabilities (8 CVEs) — patch and remediation guide — diagnosis and fix on Ubuntu 16.04

Ubuntu 16.04 — sane-backends — multiple vulnerabilities (8 CVEs) — patch and remediation guide

🟡 Medium   ⏱ 10–30 min  Last verified: 12 September 2020 Affected versions: Ubuntu 16.04 (xenial) 📖 ~4 min read  •  Source: Ubuntu Security Notice USN-4470-1 Related CVEs: CVE-2017-6318 CVE-2020-12861 CVE-2020-12862 CVE-2020-12863 CVE-2020-12864 CVE-2020-12865 CVE-2020-12866 CVE-2020-12867 Upstream summary: Kritphong Mongkhonvanit discovered that sane-backends incorrectly handled certain packets. A remote attacker could possibly use this issue […]

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Common Problems 121184

Debian 10: Nginx serves incomplete TLS certificate chain

🟠 High   ⏱ 5–30 min  Last verified: 11 September 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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Common Problems 118400

Ubuntu 16.04 apt lock errors during updates

🟡 Medium   ⏱ 5–30 min  Last verified: 11 September 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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SLES 12 — libproxy1 — multiple vulnerabilities (3 CVEs) — patch and remediation guide — diagnosis and fix on SLES 12

SLES 12 — libproxy1 — multiple vulnerabilities (3 CVEs) — patch and remediation guide

🟠 High   ⏱ 15–60 min  Last verified: 11 September 2020 Affected versions: SLES 12 📖 ~4 min read  •  Source: SUSE advisory SUSE-CU-2020:518-1 (see also SUSE bugzilla) Related CVEs: CVE-2020-25219 CVE-2020-26154 CVE-2012-4504 Upstream summary: url::recvline in url.cpp in libproxy 0.4.x through 0.4.15 allows a remote HTTP server to trigger uncontrolled recursion via a response […]

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Common Problems 117444

Ubuntu 20.04 LTS NO_PUBKEY Repository Signature Error

🟡 Medium   ⏱ 5–30 min  Last verified: 11 September 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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How to Configure NTP on IBM AIX 7.1 — step-by-step IBM AIX 7.1 tutorial on Progressive Robot

How to Configure NTP on IBM AIX 7.1

Introduction IBM AIX 7.1 is the latest release of IBM’s enterprise-grade UNIX operating system, running on IBM Power Systems hardware. Known for its reliability, security, and performance in mission-critical environments, AIX 7.1 introduces enhanced virtualization, security hardening, and cloud integration features. This guide covers how to configure ntp on ibm aix 7.1 on IBM AIX […]

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