November 2019 - Page 19 of 60

Common Problems 113110

Windows Server 2016 — Firewall profile switches to Public and blocks domain traffic — Fix & Prevention

🟠 High   ⏱ 5–30 min  Last verified: 21 November 2019 Affected versions: Windows Server 2016 📖 ~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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FreeBSD 12 — rubygem-doorkeeper-rails — vulnerability — patch and remediation guide — diagnosis and fix on FreeBSD 12

FreeBSD 12 — rubygem-doorkeeper-rails — vulnerability — patch and remediation guide

🟢 Low   ⏱ 5–15 min  Last verified: 21 November 2019 Affected versions: FreeBSD 12 📖 ~4 min read  •  Source: FreeBSD VuXML VuXML topic: rubygem-doorkeeper — token revocation vulnerability Related CVEs: CVE-2018-1000211 Upstream summary: NVD reports: Doorkeeper version 4.2.0 and later contains a Incorrect Access Control vulnerability in Token revocation API's authorized method that […]

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Gentoo Linux — app-admin/logcheck — vulnerability — patch and remediation guide — diagnosis and fix on Gentoo Linux

Gentoo Linux — app-admin/logcheck — vulnerability — patch and remediation guide

🟡 Medium   ⏱ 10–30 min  Last verified: 25 May 2026 Affected versions: Gentoo Linux 📖 ~4 min read  •  Source: Gentoo GLSA GLSA-202209-10 Related CVEs: CVE-2017-20148 Upstream summary: The pkg_postinst phase of the Logcheck ebuilds recursively chown the /etc/logcheck and /var/lib/logcheck directories. If the logcheck adds hardlinks to other files in these directories, the […]

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FreeBSD 12 — jabber — vulnerability — patch and remediation guide — diagnosis and fix on FreeBSD 12

FreeBSD 12 — jabber — vulnerability — patch and remediation guide

🟢 Low   ⏱ 5–15 min  Last verified: 21 November 2019 Affected versions: FreeBSD 12 📖 ~4 min read  •  Source: FreeBSD VuXML VuXML topic: fd_set — bitmap index overflow in multiple applications Related CVEs: CVE-2004-1378 Upstream summary: 3APA3A reports: If programmer fails to check socket number before using select() or fd_set macros, it's possible […]

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What is a Packet? — step-by-step DevOps tutorial on Progressive Robot

What is a Packet?

Packets are the basic units of data transmitted through a TCP/IP network. Originally conceived as a way to transmit data without a pre-established connection, packets make dynamic data transference possible. Packet data fall into two categories: control information (source and destination network…

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How to Set Up Fail2ban on FreeBSD 12 — step-by-step FreeBSD 12 tutorial on Progressive Robot

How to Set Up Fail2ban 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 fail2ban 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 distribution. […]

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Ubuntu 16.04 — ibus — multiple vulnerabilities (2 CVEs) — patch and remediation guide — diagnosis and fix on Ubuntu 16.04

Ubuntu 16.04 — ibus — multiple vulnerabilities (2 CVEs) — patch and remediation guide

🟢 Low   ⏱ 5–15 min  Last verified: 21 November 2019 Affected versions: Ubuntu 16.04 (xenial) 📖 ~4 min read  •  Source: Ubuntu Security Notice USN-4134-3 Related CVEs: CVE-2019-14822 https://launchpad.net/bugs/1844853 Upstream summary: USN-4134-1 fixed a vulnerability in IBus. The update caused a regression in some Qt applications and the fix was subsequently reverted in USN-4134-2. […]

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Permutations and Combinations in Python — step-by-step Python tutorial on Progressive Robot

Permutations and Combinations in Python

URL: https://www.progressiverobot.com/permutation-and-combinatios-in-python/ Permutations and Combinations of a set of elements are different arrangements of the elements of the set. Combination is a collection of the elements where the order doesn't matter Permutation is an arrangement of a set where the order does matter. Let's consider a set as : {A, B, C} The permutations of the above […]

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Ubuntu 14.04 — advancecomp — multiple vulnerabilities (2 CVEs) — patch and remediation guide — diagnosis and fix on Ubuntu 14.04

Ubuntu 14.04 — advancecomp — multiple vulnerabilities (2 CVEs) — patch and remediation guide

🟢 Low   ⏱ 5–15 min  Last verified: 21 November 2019 Affected versions: Ubuntu 14.04 (trusty) 📖 ~4 min read  •  Source: Ubuntu Security Notice USN-3936-1 Related CVEs: CVE-2019-9210 CVE-2018-1056 Upstream summary: It was discovered that AdvanceCOMP incorrectly handled certain PNG files. An attacker could possibly use this issue to execute arbitrary code. Table of […]

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How To Use MySQL with Your Ruby on Rails Application on CentOS 7 — step-by-step Linux tutorial on Progressive Robot

How To Use MySQL with Your Ruby on Rails Application on CentOS 7

Ruby on Rails uses sqlite3 as its default database, which works great in many cases, but may not be sufficient for your application. If your application requires the scalability, centralization, and control (or any other feature) that a client/server SQL database, this tutorial will show you how to do just that, with MySQL, on CentOS 7 or RHEL.

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