Security Hardening

Common Problems 119436

Debian 13 Repository Signature Error NO_PUBKEY

🟡 Medium   ⏱ 5–30 min  Last verified: 20 October 2025 📖 ~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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Debian 13 — doctrine — multiple vulnerabilities (2 CVEs) — patch and remediation guide — diagnosis and fix on Debian 13

Debian 13 — doctrine — multiple vulnerabilities (2 CVEs) — patch and remediation guide

🟢 Low   ⏱ 5–15 min  Last verified: 20 October 2025 Affected versions: Debian 13 (trixie) 📖 ~4 min read  •  Source: Debian Security Tracker Related CVEs: CVE-2011-1522 CVE-2015-5723 Upstream summary: Multiple SQL injection vulnerabilities in the Doctrine\DBAL\Platforms\AbstractPlatform::modifyLimitQuery function in Doctrine 1.x before 1.2.4 and 2.x before 2.0.3 allow remote attackers to execute arbitrary SQL […]

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Common Problems 113900

RHEL 10 – dnf fails with SSL certificate verification error against repo mirror – Fix & Prevention

🟠 High   ⏱ 5–30 min  Last verified: 20 October 2025 Affected versions: RHEL 10.0 RHEL 10.1 📖 ~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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Rocky Linux 8 — perl-Package-Generator — vulnerability — patch and remediation guide — diagnosis and fix on Rocky Linux 8

Rocky Linux 8 — perl-Package-Generator — vulnerability — patch and remediation guide

🟡 Medium   ⏱ 10–30 min  Last verified: 25 May 2026 Affected versions: Rocky Linux 8 📖 ~4 min read  •  Source: Rocky Linux RXSA RLSA-2026:8096 Related CVEs: CVE-2025-40909 Upstream summary: Perl is a high-level programming language that is commonly used for system administration utilities and web programming. Security Fix(es): * perl: Perl threads have […]

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Debian 13 — calife — vulnerability — patch and remediation guide — diagnosis and fix on Debian 13

Debian 13 — calife — vulnerability — patch and remediation guide

🟢 Low   ⏱ 5–15 min  Last verified: 20 October 2025 Affected versions: Debian 13 (trixie) 📖 ~4 min read  •  Source: Debian Security Tracker Related CVEs: CVE-2004-0188 Upstream summary: Heap-based buffer overflow in Calife 2.8.5 and earlier may allow local users to execute arbitrary code via a long password. Table of contents Symptom & […]

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Common Problems 116608

Ubuntu 24.04 LTS SSH Service Fails After Host Key or Config Changes

🔴 Critical   ⏱ 5–30 min  Last verified: 20 October 2025 Affected versions: Ubuntu 24.04 LTS 📖 ~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 — ruby2.3 — multiple vulnerabilities (20 CVEs) — patch and remediation guide — diagnosis and fix on Ubuntu 16.04

Ubuntu 16.04 — ruby2.3 — multiple vulnerabilities (20 CVEs) — patch and remediation guide

🟠 High   ⏱ 15–60 min  Last verified: 20 October 2025 Affected versions: Ubuntu 16.04 (xenial) 📖 ~4 min read  •  Source: Ubuntu Security Notice USN-8137-1 Related CVEs: CVE-2025-61594 CVE-2024-35176 CVE-2025-6442 CVE-2024-41123 CVE-2024-41946 CVE-2024-47220 CVE-2024-39908 CVE-2024-49761  +12 more Upstream summary: It was discovered that the Ruby URI gem did not properly handle sensitive information when […]

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How to Apply CIS Benchmark Hardening to Debian 13 — step-by-step Debian 13 tutorial on Progressive Robot

How to Apply CIS Benchmark Hardening to Debian 13

Introduction This guide explains how to Apply CIS Benchmark Hardening to Debian 13 on Debian 13 Trixie. Debian Trixie 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 13 install with the […]

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Windows Server 2019 — KB5071504 — multiple vulnerabilities (8 CVEs) — patch and remediation guide — diagnosis and fix on Windows Server 2019

Windows Server 2019 — KB5071504 — multiple vulnerabilities (8 CVEs) — patch and remediation guide

🟠 High   ⏱ 15–60 min  Last verified: 25 May 2026 Affected versions: Windows Server 2019 📖 ~4 min read  •  Source: Microsoft KB5071504 • MSRC update-guide entry Related CVEs: CVE-2025-62466 CVE-2025-62470 CVE-2025-62472 CVE-2025-62473 CVE-2025-62549 CVE-2025-62571 CVE-2025-62455 CVE-2025-54100 Affected components: Windows Server 2019 (Server Core installation) Microsoft summary: Null pointer dereference in Windows Client-Side Caching […]

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Ubuntu 22.04 — cifs-utils — multiple vulnerabilities (7 CVEs) — patch and remediation guide — diagnosis and fix on Ubuntu 22.04

Ubuntu 22.04 — cifs-utils — multiple vulnerabilities (7 CVEs) — patch and remediation guide

🟡 Medium   ⏱ 10–30 min  Last verified: 20 October 2025 Affected versions: Ubuntu 22.04 (jammy) 📖 ~4 min read  •  Source: Ubuntu Security Notice USN-7536-2 Related CVEs: https://launchpad.net/bugs/2113906 https://launchpad.net/bugs/2112614 CVE-2025-2312 CVE-2020-14342 CVE-2021-20208 CVE-2022-27239 CVE-2022-29869 Upstream summary: USN-7536-1 fixed vulnerabilities in cifs-utils. This update introduced a regression in certain environments. This update fixes the problem. […]

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