Security Hardening

Common Problems 113026

Windows Server 2016 SMB Multichannel Disabled After NIC Driver Update – Fix & Prevention

🟠 High   ⏱ 5–30 min  Last verified: 10 September 2020 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 — kamailio — multiple vulnerabilities (5 CVEs) — patch and remediation guide — diagnosis and fix on Ubuntu 20.04

Ubuntu 20.04 — kamailio — multiple vulnerabilities (5 CVEs) — patch and remediation guide

🟡 Medium   ⏱ 10–30 min  Last verified: 10 September 2020 Affected versions: Ubuntu 20.04 (focal) 📖 ~4 min read  •  Source: Ubuntu Security Notice USN-7416-1 Related CVEs: CVE-2016-2385 CVE-2018-14767 CVE-2020-28361 CVE-2018-16657 CVE-2020-27507 Upstream summary: Stelios Tsampas discovered that Kamailio did not correctly handle certain memory operations, which could lead to a buffer overflow. A […]

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How to Configure Group Policy on Windows Server 2012 R2 — step-by-step Windows Server 2012 R2 tutorial on Progressive Robot

How to Configure Group Policy on Windows Server 2012 R2

How to Configure Group Policy on Windows Server 2012 R2 Group Policy is the primary mechanism for centrally managing the configuration of users and computers in an Active Directory environment. Through Group Policy Objects (GPOs), administrators can enforce security settings, deploy software, configure Windows components, map drives, set desktop wallpaper, restrict access to Control Panel, […]

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Ubuntu 18.04 — libzen — vulnerability — patch and remediation guide — diagnosis and fix on Ubuntu 18.04

Ubuntu 18.04 — libzen — vulnerability — patch and remediation guide

🟢 Low   ⏱ 5–15 min  Last verified: 10 September 2020 Affected versions: Ubuntu 18.04 (bionic) 📖 ~4 min read  •  Source: Ubuntu Security Notice USN-6048-1 Related CVEs: CVE-2020-36646 Upstream summary: It was discovered that ZenLib doesn't check the return value of a specific operation before using it. An attacker could use a specially crafted […]

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Common Problems 121075

Debian 10 SSH Public Key Authentication Fails

🟠 High   ⏱ 5–30 min  Last verified: 9 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 118448

Grub Rescue Prompt After Update

🟡 Medium   ⏱ 5–30 min  Last verified: 9 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 117974

Ubuntu 18.04 time drift or NTP not syncing

🟡 Medium   ⏱ 5–30 min  Last verified: 9 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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FreeBSD 12 — apache-ant — vulnerability — patch and remediation guide — diagnosis and fix on FreeBSD 12

FreeBSD 12 — apache-ant — vulnerability — patch and remediation guide

🟢 Low   ⏱ 5–15 min  Last verified: 9 September 2020 Affected versions: FreeBSD 12 📖 ~4 min read  •  Source: FreeBSD VuXML VuXML topic: Apache Ant leaks sensitive information via the java.io.tmpdir Related CVEs: CVE-2020-1945 Upstream summary: Apache reports: Apache Ant 1.1 to 1.9.14 and 1.10.0 to 1.10.7 uses the default temporary directory identified […]

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How to Use GPFS Snapshots on IBM AIX 7.1 — step-by-step IBM AIX 7.1 tutorial on Progressive Robot

How to Use GPFS Snapshots 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 use gpfs snapshots on ibm aix 7.1 on IBM […]

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How to Tune Kernel Parameters with sysctl on FreeBSD 12 — step-by-step FreeBSD 12 tutorial on Progressive Robot

How to Tune Kernel Parameters with sysctl on FreeBSD 12

Introduction FreeBSD 12 is a UNIX-derived operating system renowned for its network stack performance, ZFS integration, and Jail isolation primitives. Setting up tune kernel parameters with sysctl on freebsd 12 on FreeBSD 12 follows the rc.conf/service(8) paradigm rather than systemd, which means enabling a service and configuring its startup options are done differently from any […]

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