April 2021 - Page 52 of 66

openSUSE Tumbleweed — pico — multiple vulnerabilities (2 CVEs) — patch and remediation guide — diagnosis and fix on openSUSE Tumbleweed

openSUSE Tumbleweed — pico — multiple vulnerabilities (2 CVEs) — patch and remediation guide

🟠 High   ⏱ 15–60 min  Last verified: 25 May 2026 Affected versions: openSUSE Tumbleweed 📖 ~4 min read  •  Source: SUSE advisory openSUSE-SU-2021:0675-1 (see also SUSE bugzilla) Related CVEs: CVE-2020-14929 CVE-2021-38370 Upstream summary: Alpine before 2.23 silently proceeds to use an insecure connection after a /tls is sent in certain circumstances involving PREAUTH, which […]

Read more
How to Set Up a LEMP Stack on Oracle Linux 8 — step-by-step Oracle Linux 8 tutorial on Progressive Robot

How to Set Up a LEMP Stack on Oracle Linux 8

Introduction This tutorial demonstrates how to Set Up a LEMP Stack on Oracle Linux 8 on Oracle Linux 8. It is written for administrators who want a repeatable, well-explained walkthrough that goes beyond a bare command list and explains each configuration choice. Every command is tested against a freshly registered Oracle Linux 8 system with […]

Read more
How to Set Up Two-Factor Authentication (2FA) for SSH on Ubuntu 26.04 — step-by-step Linux tutorial on Progressive Robot

How to Harden SSH on Ubuntu 26.04

SSH is the primary remote administration protocol for Linux servers. A default SSH configuration leaves many attack vectors open: root login, password authentication, and broad listening options. This guide hardens SSH on Ubuntu 26.04 LTS using key-based authentication, restricted access, and fail2ban. Tested and valid on: Ubuntu 26.04 LTS Prerequisites Ubuntu 26.04 LTS SSH access […]

Read more
Arch Linux — c-ares — multiple vulnerabilities (4 CVEs) — patch and remediation guide — diagnosis and fix on Arch Linux

Arch Linux — c-ares — multiple vulnerabilities (4 CVEs) — patch and remediation guide

🟠 High   ⏱ 15–60 min  Last verified: 25 May 2026 Affected versions: Arch Linux (rolling release) 📖 ~4 min read  •  Source: Arch ASA ASA-201609-31 Related CVEs: CVE-2016-5180 CVE-2021-3672 CVE-2020-8277 CVE-2017-1000381 Upstream summary: Type: arbitrary code execution. Status: Fixed. Affected: 1.11.0-1. Fixed in: 1.12.0-1. Group: AVG-37. Table of contents Symptom & Impact Environment & […]

Read more
如何在Ubuntu 18.04上安装Python 3并建立本地编程环境 — step-by-step Linux tutorial on Progressive Robot

如何在Ubuntu 18.04上安装Python 3并建立本地编程环境

Python是一种灵活多样的编程语言。它的用途广泛,在脚本、自动化、数据分析、机器学习和后端开发方面都具有优势。Python于1991年首次发行,名字的灵感来源于英国喜剧团体“Monty Python”,因此Python开发团队希望让Python用起来很有趣。易于安装配置、代码风格相对简单直接、有即时的反馈和报错,这些特性让Python成为编程初学者的一个很好选择,也同样适合有经验的程序员。[Python…

Read more
Ubuntu 18.04 — lz4 — vulnerability — patch and remediation guide — diagnosis and fix on Ubuntu 18.04

Ubuntu 18.04 — lz4 — vulnerability — patch and remediation guide

🟢 Low   ⏱ 5–15 min  Last verified: 25 May 2026 Affected versions: Ubuntu 18.04 (bionic) 📖 ~4 min read  •  Source: Ubuntu Security Notice USN-4968-1 Related CVEs: CVE-2021-3520 Upstream summary: It was discovered that LZ4 incorrectly handled certain memory operations. If a user or automated system were tricked into uncompressing a specially- crafted LZ4 […]

Read more
Ubuntu 16.04 — opensmtpd — multiple vulnerabilities (3 CVEs) — patch and remediation guide — diagnosis and fix on Ubuntu 16.04

Ubuntu 16.04 — opensmtpd — multiple vulnerabilities (3 CVEs) — patch and remediation guide

🟡 Medium   ⏱ 10–30 min  Last verified: 25 May 2026 Affected versions: Ubuntu 16.04 (xenial) 📖 ~4 min read  •  Source: Ubuntu Security Notice USN-4875-1 Related CVEs: CVE-2020-7247 CVE-2020-8793 CVE-2020-8794 Upstream summary: It was discovered that OpenSMTPD incorrectly verified the sender's or receiver's e-mail addresses under certain conditions. An attacker could possibly use this […]

Read more
CHAT