chris

Debian 11 — node-set-value — multiple vulnerabilities (2 CVEs) — patch and remediation guide — diagnosis and fix on Debian 11

Debian 11 — node-set-value — multiple vulnerabilities (2 CVEs) — patch and remediation guide

🟢 Low   ⏱ 5–15 min  Last verified: 30 October 2021 Affected versions: Debian 11 (bullseye) 📖 ~4 min read  •  Source: Debian Security Tracker Related CVEs: CVE-2019-10747 CVE-2021-23440 Upstream summary: set-value is vulnerable to Prototype Pollution in versions lower than 3.0.1. The function mixin-deep could be tricked into adding or modifying properties of Object.prototype […]

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Debian 11 — pcre3 — multiple vulnerabilities (20 CVEs) — patch and remediation guide — diagnosis and fix on Debian 11

Debian 11 — pcre3 — multiple vulnerabilities (20 CVEs) — patch and remediation guide

🟠 High   ⏱ 15–60 min  Last verified: 30 October 2021 Affected versions: Debian 11 (bullseye) 📖 ~4 min read  •  Source: Debian Security Tracker Related CVEs: CVE-2005-2491 CVE-2005-4872 CVE-2006-7225 CVE-2006-7226 CVE-2006-7227 CVE-2006-7228 CVE-2006-7230 CVE-2007-1659  +12 more Upstream summary: Integer overflow in pcre_compile.c in Perl Compatible Regular Expressions (PCRE) before 6.2, as used in multiple […]

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How to Harden SSH on RHEL 7 — step-by-step RHEL 7 tutorial on Progressive Robot

How to Harden SSH on RHEL 7

How to Harden SSH on RHEL 7 SSH (Secure Shell) is the primary remote administration protocol for RHEL 7 servers, and by default its configuration leaves several attack vectors open. Brute-force attacks against exposed SSH ports are constant on any internet-facing host, making SSH hardening one of the first tasks every RHEL 7 administrator should […]

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How To Install and Secure Grafana on Ubuntu 20.04 — step-by-step Linux tutorial on Progressive Robot

How To Install and Secure Grafana on Ubuntu 20.04

Grafana is an open-source data visualization and monitoring tool that integrates with complex data sources like Prometheus and ElasticSearch. Grafana lets you create alerts, notifications, and ad-hoc filters for your data while also making collaboration with your teammates easier through built-in sharing features. In this tutorial, you will install Grafana and secure it with an SSL certificate and an Nginx reverse proxy. You will also set up GitHub authentication.

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Common Problems 117594

Nginx 502 Bad Gateway to PHP-FPM

🟠 High   ⏱ 5–30 min  Last verified: 29 October 2021 Affected versions: 20.04 📖 ~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 […]

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AlmaLinux 8 — libnl3 — vulnerability — patch and remediation guide — diagnosis and fix on AlmaLinux 8

AlmaLinux 8 — libnl3 — vulnerability — patch and remediation guide

🟡 Medium   ⏱ 10–30 min  Last verified: 25 May 2026 Affected versions: AlmaLinux 8 📖 ~4 min read  •  Source: AlmaLinux ALSA ALBA-2020:1847 Upstream summary: For detailed information on changes in this release, see the AlmaLinux Release Notes linked from the References section. Table of contents Symptom & Impact Environment & Reproduction Root Cause […]

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Oracle Linux 8 — gnutls — security and stability fixes — required update — diagnosis and fix on Oracle Linux 8

Oracle Linux 8 — gnutls — security and stability fixes — required update (ELSA-2020-5483)

🟡 Medium   ⏱ 10–30 min  Last verified: 29 October 2021 Affected versions: Oracle Linux 8 📖 ~4 min read  •  Source: ELSA advisory ELSA-2020-5483 Related CVEs: CVE-2020-24659 Table of contents Symptom & Impact Environment & Reproduction Root Cause Analysis Quick Triage Step-by-Step Diagnosis Solution – Primary Fix Solution – Alternative Approaches Verification & Acceptance […]

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FreeBSD 13 — py310-tuf — vulnerability — patch and remediation guide — diagnosis and fix on FreeBSD 13

FreeBSD 13 — py310-tuf — vulnerability — patch and remediation guide

🟢 Low   ⏱ 5–15 min  Last verified: 29 October 2021 Affected versions: FreeBSD 13 📖 ~4 min read  •  Source: FreeBSD VuXML VuXML topic: The Update Framwork — path traversal vulnerability Related CVEs: CVE-2021-41131 Upstream summary: NVD reports: python-tuf is a Python reference implementation of The Update Framework (TUF). In both clients (`tuf/client` and […]

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How to Set Up Amanda Backup on FreeBSD 12 — step-by-step FreeBSD 12 tutorial on Progressive Robot

How to Set Up Amanda Backup 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 set up amanda backup 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 Linux […]

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