December 2021 - Page 68 of 71

How to Configure DNSSEC on FreeBSD 13 — step-by-step FreeBSD 13 tutorial on Progressive Robot

How to Configure DNSSEC on FreeBSD 13

Introduction Deploying configure dnssec on freebsd 13 on a FreeBSD 13 machine differs from Linux in several important ways: packages come from the FreeBSD Ports Collection or the binary pkg repository, services are registered in /etc/rc.conf via sysrc(8), and firewall rules are written in pf.conf(5) syntax. This tutorial stays entirely within the standard base + […]

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Common Problems 115113

RHEL 8 Postfix cannot send mail due to firewall and SELinux policy

🟡 Medium   ⏱ 5–30 min  Last verified: 20 May 2026 📖 ~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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openSUSE Tumbleweed — libZXing1 — multiple vulnerabilities (3 CVEs) — patch and remediation guide — diagnosis and fix on openSUSE Tumbleweed

openSUSE Tumbleweed — libZXing1 — multiple vulnerabilities (3 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-2022:0157-1 (see also SUSE bugzilla) Related CVEs: CVE-2021-28021 CVE-2021-42716 CVE-2021-42715 Upstream summary: Buffer overflow vulnerability in function stbi__extend_receive in stb_image.h in stb 2.26 via a crafted JPEG file. Table of contents Symptom […]

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Java Download File from URL — step-by-step Programming tutorial on Progressive Robot

Java Download File from URL

URL: https://www.progressiverobot.com/java-download-file-url/ Today we will learn how to download a file from URL in java. We can use java.net.URL openStream() method to download file from URL in java program. We can use Java NIO Channels or Java IO InputStream to read data from the URL open stream and then save it to file. Java Download […]

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FreeBSD 13 — py39-salt — multiple vulnerabilities (10 CVEs) — patch and remediation guide — diagnosis and fix on FreeBSD 13

FreeBSD 13 — py39-salt — multiple vulnerabilities (10 CVEs) — patch and remediation guide

🟠 High   ⏱ 15–60 min  Last verified: 25 May 2026 Affected versions: FreeBSD 13 📖 ~4 min read  •  Source: FreeBSD VuXML VuXML topic: salt — multiple vulnerabilities Related CVEs: CVE-2020-28243 CVE-2020-28972 CVE-2020-35662 CVE-2021-25281 CVE-2021-25282 CVE-2021-25283 CVE-2021-25284 CVE-2021-3144  +2 more Upstream summary: SaltStack reports multiple security vulnerabilities in Salt CVE-2021-3197: The Salt-API.s SSH client […]

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FreeBSD 12 — py36-salt — multiple vulnerabilities (20 CVEs) — patch and remediation guide — diagnosis and fix on FreeBSD 12

FreeBSD 12 — py36-salt — multiple vulnerabilities (20 CVEs) — patch and remediation guide

🟠 High   ⏱ 15–60 min  Last verified: 25 May 2026 Affected versions: FreeBSD 12 📖 ~4 min read  •  Source: FreeBSD VuXML VuXML topic: salt — multiple vulnerabilities Related CVEs: CVE-2017-12791 CVE-2017-14695 CVE-2017-14696 CVE-2018-15750 CVE-2018-15751 CVE-2019-17361 CVE-2020-11651 CVE-2020-11652  +12 more Upstream summary: SaltStack reports multiple security vulnerabilities in Salt CVE-2021-3197: The Salt-API.s SSH client […]

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How To Work with String Methods in Ruby — step-by-step Programming tutorial on Progressive Robot

How To Work with String Methods in Ruby

Ruby strings have many built-in methods that make it easy to modify and manipulate text, a common task in many programs. In this tutorial, you’ll use string methods to determine the length of a string, index and split strings to extract substrings, add and remove whitespace and other characters, change the case of characters in strings, and find and replace text. When you’re done, you’ll be able to incorporate these methods into your own programs.

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How to Install Go and Build CLI Tools on RHEL 7 — step-by-step RHEL 7 tutorial on Progressive Robot

How to Install Go and Build CLI Tools on RHEL 7

How to Install Go and Build CLI Tools on RHEL 7 Go (also known as Golang) is a statically typed, compiled language developed by Google that has become a popular choice for building command-line tools, system utilities, microservices, and cloud-native applications. Its fast compilation times, straightforward toolchain, and ability to produce single, self-contained binaries make […]

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Debian 11 — libvc — vulnerability — patch and remediation guide — diagnosis and fix on Debian 11

Debian 11 — libvc — vulnerability — patch and remediation guide

🟢 Low   ⏱ 5–15 min  Last verified: 25 May 2026 Affected versions: Debian 11 (bullseye) 📖 ~4 min read  •  Source: Debian Security Tracker Related CVEs: CVE-2006-1356 Upstream summary: Stack-based buffer overflow in the count_vcards function in LibVC 3, as used in Rolo, allows user-assisted attackers to execute arbitrary code via a vCard file […]

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