Security Hardening

Common Problems 117438

Ubuntu 20.04 LTS – apt update returns 404 Not Found for package indexes

🟡 Medium   ⏱ 5–30 min  Last verified: 3 October 2021 Affected versions: Ubuntu 20.04 LTS Ubuntu 20.04 Ubuntu 20.04.6 📖 ~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 […]

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How to Install VictoriaMetrics on FreeBSD 13 — step-by-step FreeBSD 13 tutorial on Progressive Robot

How to Install VictoriaMetrics on FreeBSD 13

Introduction This guide explains how to Install VictoriaMetrics on FreeBSD 13 on FreeBSD 13. FreeBSD uses the pkg(8) binary package manager, rc.conf(5) for service startup configuration, and pf(4) as its primary packet filter. There is no SELinux or AppArmor — instead, FreeBSD provides the MAC (Mandatory Access Control) framework and Capsicum for fine-grained privilege separation. […]

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Debian 11 — lucene-solr — multiple vulnerabilities (17 CVEs) — patch and remediation guide — diagnosis and fix on Debian 11

Debian 11 — lucene-solr — multiple vulnerabilities (17 CVEs) — patch and remediation guide

🟠 High   ⏱ 15–60 min  Last verified: 3 October 2021 Affected versions: Debian 11 (bullseye) 📖 ~4 min read  •  Source: Debian Security Tracker Related CVEs: CVE-2012-6612 CVE-2013-6397 CVE-2013-6407 CVE-2013-6408 CVE-2017-12629 CVE-2017-3163 CVE-2017-3164 CVE-2018-1308  +9 more Upstream summary: The (1) UpdateRequestHandler for XSLT or (2) XPathEntityProcessor in Apache Solr before 4.1 allows remote attackers […]

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

Debian 11 — pngcrush — vulnerability — patch and remediation guide

🟢 Low   ⏱ 5–15 min  Last verified: 3 October 2021 Affected versions: Debian 11 (bullseye) 📖 ~4 min read  •  Source: Debian Security Tracker Related CVEs: CVE-2015-7700 Upstream summary: Double-free vulnerability in the sPLT chunk structure and png.c in pngcrush before 1.7.87 allows attackers to have unspecified impact via unknown vectors. Table of contents […]

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Ubuntu 20.04 — ldns — multiple vulnerabilities (2 CVEs) — patch and remediation guide — diagnosis and fix on Ubuntu 20.04

Ubuntu 20.04 — ldns — multiple vulnerabilities (2 CVEs) — patch and remediation guide

🟢 Low   ⏱ 5–15 min  Last verified: 3 October 2021 Affected versions: Ubuntu 20.04 (focal) 📖 ~4 min read  •  Source: Ubuntu Security Notice USN-5257-2 Related CVEs: CVE-2020-19860 CVE-2020-19861 Upstream summary: USN-5257-1 fixed several vulnerabilities in ldns. This update provides the corresponding update for Ubuntu 20.04 ESM and Ubuntu 22.04 ESM. Original advisory details: […]

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FreeBSD 13 — phpmyadmin — multiple vulnerabilities (20 CVEs) — patch and remediation guide — diagnosis and fix on FreeBSD 13

FreeBSD 13 — phpmyadmin — multiple vulnerabilities (20 CVEs) — patch and remediation guide (PATCH-REMEDIATION-2)

🟠 High   ⏱ 15–60 min  Last verified: 3 October 2021 Affected versions: FreeBSD 13 📖 ~4 min read  •  Source: FreeBSD VuXML VuXML topic: phpmyadmin — multiple vulnerabilities Related CVEs: CVE-2005-0543 CVE-2005-0544 CVE-2005-0567 CVE-2005-0653 CVE-2005-0992 CVE-2007-6100 CVE-2016-1927 CVE-2016-2038  +12 more Upstream summary: the phpmyadmin team reports: This security fix is part of an ongoing […]

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FreeBSD 13 — wireshark-lite — multiple vulnerabilities (20 CVEs) — patch and remediation guide — diagnosis and fix on FreeBSD 13

FreeBSD 13 — wireshark-lite — multiple vulnerabilities (20 CVEs) — patch and remediation guide

🟠 High   ⏱ 15–60 min  Last verified: 3 October 2021 Affected versions: FreeBSD 13 📖 ~4 min read  •  Source: FreeBSD VuXML VuXML topic: wireshark — multiple security issues Related CVEs: CVE-2007-3389 CVE-2007-3390 CVE-2007-3391 CVE-2007-3392 CVE-2007-3393 CVE-2007-6112 CVE-2007-6113 CVE-2007-6114  +12 more Upstream summary: wireshark developers reports: wnpa-sec-2018-05. IEEE 802.11 dissector crash. (CVE-2018-7335) wnpa-sec-2018-06. Large […]

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Gentoo Linux — net-mail/mailutils — multiple vulnerabilities (2 CVEs) — patch and remediation guide — diagnosis and fix on Gentoo Linux

Gentoo Linux — net-mail/mailutils — multiple vulnerabilities (2 CVEs) — patch and remediation guide

🟠 High   ⏱ 15–60 min  Last verified: 25 May 2026 Affected versions: Gentoo Linux 📖 ~4 min read  •  Source: Gentoo GLSA GLSA-202310-13 Related CVEs: CVE-2021-32749 CVE-2019-18862 Upstream summary: A vulnerability has been discovered in GNU Mailutils. Please review the CVE identifier referenced below for details. Table of contents Symptom & Impact Environment & […]

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Common Problems 115469

RHEL 7 SSH login denied due to key permissions and SELinux context

🟠 High   ⏱ 5–30 min  Last verified: 3 October 2021 Affected versions: RHEL 7 📖 ~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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Oracle Linux 8 — virt-manager security, bug fix, and — enhancement update — new behaviour and fixes — diagnosis and fix on Oracle Linux 8

Oracle Linux 8 — virt-manager security, bug fix, and — enhancement update — new behaviour and fixes (ELSA-2019-3464)

🟢 Low   ⏱ 5–15 min  Last verified: 2 October 2021 Affected versions: Oracle Linux 8 📖 ~4 min read  •  Source: ELSA advisory ELSA-2019-3464 Related CVEs: CVE-2019-10183 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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