Security Hardening

Common Problems 118089

Ubuntu 18.04 LTS Fail2ban Bans Legitimate Admin IPs

🟡 Medium   ⏱ 5–30 min  Last verified: 16 March 2020 Affected versions: 18.04 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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How to Install and Configure Rclone on Debian 10 — step-by-step Debian 10 tutorial on Progressive Robot

How to Install and Configure Rclone on Debian 10

Introduction Deploying install and configure rclone on debian 10 on a Debian 10 Buster machine is straightforward thanks to Debian’s policy-compliant packaging. Unlike rpm-based distributions, Debian stores configuration helpers in /etc/default/, uses update-rc.d for older init scripts, and provides dpkg-reconfigure for interactive package configuration. This tutorial stays on the systemd path throughout. Prerequisites Ensure Debian […]

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Alpine Linux edge — xbps — vulnerability — patch and remediation guide — diagnosis and fix on Alpine Linux edge

Alpine Linux edge — xbps — vulnerability — patch and remediation guide

🟡 Medium   ⏱ 10–30 min  Last verified: 25 May 2026 Affected versions: Alpine Linux edge / fixed in 0.58-r0 📖 ~4 min read  •  Source: Alpine secdb entry — xbps 0.58-r0 Related CVEs: CVE-2020-7450 Upstream summary: Alpine community repository for vedge ships xbps 0.58-r0 which addresses CVE-2020-7450. Table of contents Symptom & Impact Environment […]

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FreeBSD 12 — vim-console — multiple vulnerabilities (6 CVEs) — patch and remediation guide — diagnosis and fix on FreeBSD 12

FreeBSD 12 — vim-console — multiple vulnerabilities (6 CVEs) — patch and remediation guide

🟡 Medium   ⏱ 10–30 min  Last verified: 16 March 2020 Affected versions: FreeBSD 12 📖 ~4 min read  •  Source: FreeBSD VuXML VuXML topic: Vim/NeoVim — Security vulnerability Related CVEs: CVE-2004-1138 CVE-2005-2368 CVE-2007-2953 CVE-2008-2712 CVE-2008-3076 CVE-2016-1248 Upstream summary: Security releases for Vim/NeoVim: Sandbox escape allows for arbitrary code execution. Table of contents Symptom & […]

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openSUSE Tumbleweed — quassel-base — multiple vulnerabilities (5 CVEs) — patch and remediation guide — diagnosis and fix on openSUSE Tumbleweed

openSUSE Tumbleweed — quassel-base — multiple vulnerabilities (5 CVEs) — patch and remediation guide

🟠 High   ⏱ 15–60 min  Last verified: 25 May 2026 Affected versions: openSUSE Tumbleweed 📖 ~4 min read  •  Source: SUSE security advisory (see also SUSE bugzilla) Related CVEs: CVE-2018-1000178 CVE-2013-4422 CVE-2015-8547 CVE-2018-1000179 CVE-2016-4414 Upstream summary: A heap corruption of type CWE-120 exists in quassel version 0.12.4 in quasselcore in void DataStreamPeer::processMessage(const QByteArray &msg) […]

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FreeBSD 12 — linux-c6-nss — multiple vulnerabilities (10 CVEs) — patch and remediation guide — diagnosis and fix on FreeBSD 12

FreeBSD 12 — linux-c6-nss — multiple vulnerabilities (10 CVEs) — patch and remediation guide

🟠 High   ⏱ 15–60 min  Last verified: 16 March 2020 Affected versions: FreeBSD 12 📖 ~4 min read  •  Source: FreeBSD VuXML VuXML topic: nss — Use-after-free in TLS 1.2 generating handshake hashes Related CVEs: CVE-2014-1568 CVE-2015-7575 CVE-2016-1938 CVE-2016-1950 CVE-2016-1978 CVE-2016-1979 CVE-2016-2834 CVE-2017-5461  +2 more Upstream summary: Mozilla reports: During TLS 1.2 exchanges, handshake […]

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FreeBSD 12 — pdftohtml — multiple vulnerabilities (3 CVEs) — patch and remediation guide — diagnosis and fix on FreeBSD 12

FreeBSD 12 — pdftohtml — multiple vulnerabilities (3 CVEs) — patch and remediation guide

🟡 Medium   ⏱ 10–30 min  Last verified: 16 March 2020 Affected versions: FreeBSD 12 📖 ~4 min read  •  Source: FreeBSD VuXML VuXML topic: xpdf — stack based buffer overflow Related CVEs: CVE-2004-1125 CVE-2005-0064 CVE-2007-3387 Upstream summary: The KDE Team reports: kpdf, the KDE pdf viewer, shares code with xpdf. xpdf contains a vulnerability […]

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Ubuntu 18.04 — golang-github-docker-docker-credential-helpers — vulnerability — patch and remediation guide — diagnosis and fix on Ubuntu 18.04

Ubuntu 18.04 — golang-github-docker-docker-credential-helpers — vulnerability — patch and remediation guide

🟢 Low   ⏱ 5–15 min  Last verified: 16 March 2020 Affected versions: Ubuntu 18.04 (bionic) 📖 ~4 min read  •  Source: Ubuntu Security Notice USN-4856-1 Related CVEs: CVE-2019-1020014 Upstream summary: Jasiel Spelman discovered that docker-credential-helpers has a double free. A local attacker could use this to cause a denial of service (crash) or possibly […]

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How to Configure LDAP on Windows Server 2016 — step-by-step Windows Server 2016 tutorial on Progressive Robot

How to Configure LDAP on Windows Server 2016

How to Configure Windows Server 2016 LDAP Lightweight Directory Access Protocol (LDAP) is the standard protocol used to query and modify entries in Active Directory on Windows Server 2016. Applications, scripts, and management tools communicate with Active Directory over LDAP on port 389 (unencrypted or with STARTTLS) and LDAPS on port 636 (LDAP over SSL/TLS). […]

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

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

🟢 Low   ⏱ 5–15 min  Last verified: 16 March 2020 Affected versions: Ubuntu 16.04 (xenial) 📖 ~4 min read  •  Source: Ubuntu Security Notice USN-5173-2 Related CVEs: CVE-2019-14462 CVE-2019-14463 Upstream summary: USN-5173-1 fixed vulnerabilities in libmodbus. This update provides the corresponding updates for Ubuntu 14.04 ESM and Ubuntu 16.04 ESM. Original advisory details: It […]

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