Operations

SLES 15 — ruby2.5-rubygem-nokogiri — multiple vulnerabilities (11 CVEs) — patch and remediation guide — diagnosis and fix on SLES 15

SLES 15 — ruby2.5-rubygem-nokogiri — multiple vulnerabilities (11 CVEs) — patch and remediation guide

🟠 High   ⏱ 15–60 min  Last verified: 24 February 2023 Affected versions: SLES 15 📖 ~4 min read  •  Source: SUSE advisory SUSE-SU-2022:3890-1 (see also SUSE bugzilla) Related CVEs: CVE-2022-24836 CVE-2022-29181 CVE-2018-3740 CVE-2019-5477 CVE-2015-8241 CVE-2015-8317 CVE-2016-5131 CVE-2017-15412  +3 more Upstream summary: Nokogiri is an open source XML and HTML library for Ruby. Nokogiri `< […]

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How to Configure a DHCP Server on Windows Server 2012 R2 — step-by-step Windows Server 2012 R2 tutorial on Progressive Robot

How to Configure a DHCP Server on Windows Server 2012 R2

How to Configure a DHCP Server on Windows Server 2012 R2 The Dynamic Host Configuration Protocol (DHCP) automates the assignment of IP addresses, subnet masks, default gateways, DNS servers, and other network configuration parameters to clients on a network. Without DHCP, every device would require manual static IP configuration — an unmanageable burden in environments […]

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SLES 15 — libsasl2 — multiple vulnerabilities (4 CVEs) — patch and remediation guide — diagnosis and fix on SLES 15

SLES 15 — libsasl2 — multiple vulnerabilities (4 CVEs) — patch and remediation guide

🟠 High   ⏱ 15–60 min  Last verified: 24 February 2023 Affected versions: SLES 15 📖 ~4 min read  •  Source: SUSE advisory SUSE-CU-2022:1151-1 (see also SUSE bugzilla) Related CVEs: CVE-2022-24407 CVE-2019-19906 CVE-2020-8032 CVE-2009-0688 Upstream summary: In Cyrus SASL 2.1.17 through 2.1.27 before 2.1.28, plugins/sql.c does not escape the password for a SQL INSERT or […]

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Rocky Linux 8 — python-dns — multiple vulnerabilities (2 CVEs) — patch and remediation guide — diagnosis and fix on Rocky Linux 8

Rocky Linux 8 — python-dns — multiple vulnerabilities (2 CVEs) — patch and remediation guide

🟠 High   ⏱ 15–60 min  Last verified: 25 May 2026 Affected versions: Rocky Linux 8 📖 ~4 min read  •  Source: Rocky Linux RXSA RLSA-2023:5994 Related CVEs: CVE-2023-40217 CVE-2023-32681 Upstream summary: Python is an interpreted, interactive, object-oriented programming language that supports modules, classes, exceptions, high-level dynamic data types, and dynamic typing. The python27 packages […]

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Oracle Linux 9 — haproxy — vulnerability — patch and remediation guide — diagnosis and fix on Oracle Linux 9

Oracle Linux 9 — haproxy — vulnerability — patch and remediation guide (ELSA-2024-1142)

🟡 Medium   ⏱ 10–30 min  Last verified: 24 February 2023 Affected versions: Oracle Linux 9 📖 ~4 min read  •  Source: ELSA advisory ELSA-2024-1142 Related CVEs: CVE-2023-40225 CVE-2023-45539 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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Amazon Linux 2 — thunderbird — multiple vulnerabilities (20 CVEs) — patch and remediation guide — diagnosis and fix on Amazon Linux 2

Amazon Linux 2 — thunderbird — multiple vulnerabilities (20 CVEs) — patch and remediation guide

🔴 Critical   ⏱ 15–90 min  Last verified: 25 May 2026 Affected versions: Amazon Linux 2 📖 ~4 min read  •  Source: Amazon Linux advisory ALAS2-2022-1804 Related CVEs: CVE-2022-1529 CVE-2022-1802 CVE-2020-16044 CVE-2020-15673 CVE-2020-15676 CVE-2020-15677 CVE-2020-15678 CVE-2020-15683  +12 more Upstream summary: The Mozilla Foundation Security Advisory describes this flaw as: An attacker could have sent a […]

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How to Set Up Windows Server 2022 Environment Variables — step-by-step Windows Server 2022 tutorial on Progressive Robot

How to Set Up Windows Server 2022 Environment Variables

Why Monitor Hyper-V with Performance Counters? Performance counters are the foundation of Hyper-V health monitoring on Windows Server 2022. They expose real-time and historical metrics for every layer of the virtualisation stack: hypervisor scheduling, virtual processor utilisation, memory pressure, virtual storage I/O, and virtual network throughput. Without monitoring these counters, capacity planning is guesswork and […]

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Oracle Linux 9 — java-17-openjdk security, bug fix, and — enhancement update — new behaviour and fixes — diagnosis and fix on Oracle Linux 9

Oracle Linux 9 — java-17-openjdk security, bug fix, and — enhancement update — new behaviour and fixes (ELSA-2022-5736)

🟠 High   ⏱ 15–60 min  Last verified: 23 February 2023 Affected versions: Oracle Linux 9 📖 ~4 min read  •  Source: ELSA advisory ELSA-2022-5736 Related CVEs: CVE-2022-34169 CVE-2022-21541 CVE-2022-21549 CVE-2022-21540 Table of contents Symptom & Impact Environment & Reproduction Root Cause Analysis Quick Triage Step-by-Step Diagnosis Solution – Primary Fix Solution – Alternative Approaches […]

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Common Problems 117911

Ubuntu 18.04 APT Lock File Error During Package Install

🟡 Medium   ⏱ 5–30 min  Last verified: 23 February 2023 📖 ~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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Amazon Linux 2 — resteasy-base — multiple vulnerabilities (2 CVEs) — patch and remediation guide — diagnosis and fix on Amazon Linux 2

Amazon Linux 2 — resteasy-base — multiple vulnerabilities (2 CVEs) — patch and remediation guide

🟡 Medium   ⏱ 10–30 min  Last verified: 25 May 2026 Affected versions: Amazon Linux 2 📖 ~4 min read  •  Source: Amazon Linux advisory ALAS2-2024-2398 Related CVEs: CVE-2021-20289 CVE-2023-0482 Upstream summary: A flaw was found in RESTEasy in all versions of RESTEasy up to 4.6.0.Final. The endpoint class and method names are returned as […]

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CHAT