Logging Monitoring

Common Problems 114933

RHEL 8 SELinux AVC denies web application write access

🟡 Medium   ⏱ 5–30 min  Last verified: 11 August 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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Ubuntu 18.04 — grub2 — multiple vulnerabilities (10 CVEs) — patch and remediation guide — diagnosis and fix on Ubuntu 18.04

Ubuntu 18.04 — grub2 — multiple vulnerabilities (10 CVEs) — patch and remediation guide

🟠 High   ⏱ 15–60 min  Last verified: 11 August 2020 Affected versions: Ubuntu 18.04 (bionic) 📖 ~4 min read  •  Source: Ubuntu Security Notice USN-4432-2 Related CVEs: https://launchpad.net/bugs/1889556 https://wiki.ubuntu.com/SecurityTeam/KnowledgeBase/GRUB2SecureBootBypass CVE-2020-10713 CVE-2020-14308 CVE-2020-14309 CVE-2020-14310 CVE-2020-14311 CVE-2020-15705  +2 more Upstream summary: USN-4432-1 fixed vulnerabilities in GRUB2 affecting Secure Boot environments. Unfortunately, the update introduced regressions for […]

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How to Configure SSL/TLS Client Certificate Authentication on Debian 10 — step-by-step Debian 10 tutorial on Progressive Robot

How to Configure SSL/TLS Client Certificate Authentication on Debian 10

Introduction How to Configure SSL/TLS Client Certificate Authentication on Debian 10 is a fundamental operation for any administrator maintaining a Debian 10 Buster server. Debian 10 Buster ships with the Linux 6.12 kernel, updated toolchains, and a fully refreshed package archive — meaning version numbers, configuration file paths, and some dependency chains differ from Debian […]

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How to Configure a Read-Only Domain Controller (RODC) on Windows Server 2016 — step-by-step Windows Server 2016 tutorial on Progressive Robot

How to Configure a Read-Only Domain Controller (RODC) on Windows Server 2016

How to Set Up Windows Server 2016 Read-Only Domain Controller A Read-Only Domain Controller (RODC) is a special type of Domain Controller introduced in Windows Server 2008 that holds a read-only copy of the Active Directory database. RODCs are designed for deployment in locations where physical security cannot be guaranteed, such as branch offices, edge […]

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Common Problems 121558

DNS Resolution Intermittently Fails on Server

🟠 High   ⏱ 5–30 min  Last verified: 10 August 2020 Affected versions: Debian 9 📖 ~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 121017

Debian 10 Temporary Failure Resolving During apt update

🟡 Medium   ⏱ 5–30 min  Last verified: 10 August 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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Ubuntu 16.04 — grub2-signed — multiple vulnerabilities (10 CVEs) — patch and remediation guide — diagnosis and fix on Ubuntu 16.04

Ubuntu 16.04 — grub2-signed — multiple vulnerabilities (10 CVEs) — patch and remediation guide

🟠 High   ⏱ 15–60 min  Last verified: 10 August 2020 Affected versions: Ubuntu 16.04 (xenial) 📖 ~4 min read  •  Source: Ubuntu Security Notice USN-4432-2 Related CVEs: https://launchpad.net/bugs/1889556 https://wiki.ubuntu.com/SecurityTeam/KnowledgeBase/GRUB2SecureBootBypass CVE-2020-10713 CVE-2020-14308 CVE-2020-14309 CVE-2020-14310 CVE-2020-14311 CVE-2020-15705  +2 more Upstream summary: USN-4432-1 fixed vulnerabilities in GRUB2 affecting Secure Boot environments. Unfortunately, the update introduced regressions for […]

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How to Install and Configure Julia on Debian 10 — step-by-step Debian 10 tutorial on Progressive Robot

How to Install and Configure Julia on Debian 10

Introduction This guide explains how to Install and Configure Julia on Debian 10 on Debian 10 Buster. Debian Buster uses systemd for service management, nftables as the underlying packet filter (with ufw or iptables front-ends still available), and AppArmor for mandatory access control. Every command is designed for a minimal Debian 10 install with the […]

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SLES 15 — libexempi3 — multiple vulnerabilities (7 CVEs) — patch and remediation guide — diagnosis and fix on SLES 15

SLES 15 — libexempi3 — multiple vulnerabilities (7 CVEs) — patch and remediation guide

🟡 Medium   ⏱ 10–30 min  Last verified: 10 August 2020 Affected versions: SLES 15 📖 ~4 min read  •  Source: SUSE advisory SUSE-SU-2023:3734-1 (see also SUSE bugzilla) Related CVEs: CVE-2020-18651 CVE-2020-18652 CVE-2018-12648 CVE-2018-7728 CVE-2018-7729 CVE-2018-7730 CVE-2018-7731 Upstream summary: Buffer Overflow vulnerability in function ID3_Support::ID3v2Frame::getFrameValue in exempi 2.5.0 and earlier allows remote attackers to cause […]

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

Oracle Linux 8 — GraalVM — vulnerability — patch and remediation guide (ELSA-2023-12312)

🟠 High   ⏱ 15–60 min  Last verified: 10 August 2020 Affected versions: Oracle Linux 8 📖 ~4 min read  •  Source: ELSA advisory ELSA-2023-12312 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 […]

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