Security Hardening

Ubuntu 20.04 — olm — vulnerability — patch and remediation guide — diagnosis and fix on Ubuntu 20.04

Ubuntu 20.04 — olm — vulnerability — patch and remediation guide

🟢 Low   ⏱ 5–15 min  Last verified: 2 November 2021 Affected versions: Ubuntu 20.04 (focal) 📖 ~4 min read  •  Source: Ubuntu Security Notice USN-5194-1 Related CVEs: CVE-2021-34813 Upstream summary: Denis Kasak discovered that Olm was not verifying the length of input being processed by the olm_pk_decrypt module, which introduced a stack-based buffer overflow […]

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SLES 15 — caribou — vulnerability — patch and remediation guide — diagnosis and fix on SLES 15

SLES 15 — caribou — vulnerability — patch and remediation guide

🟠 High   ⏱ 15–60 min  Last verified: 2 November 2021 Affected versions: SLES 15 📖 ~4 min read  •  Source: SUSE advisory SUSE-SU-2021:1943-1 (see also SUSE bugzilla) Related CVEs: CVE-2021-3567 Upstream summary: A flaw was found in Caribou due to a regression of CVE-2020-25712 fix. An attacker could use this flaw to bypass screen-locking […]

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Oracle Linux 8 — python3 — vulnerability — patch and remediation guide — diagnosis and fix on Oracle Linux 8

Oracle Linux 8 — python3 — vulnerability — patch and remediation guide (ELSA-2021-4399)

🟡 Medium   ⏱ 10–30 min  Last verified: 2 November 2021 Affected versions: Oracle Linux 8 📖 ~4 min read  •  Source: ELSA advisory ELSA-2021-4399 Related CVEs: CVE-2021-3426 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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Oracle Linux 8 — curl — vulnerability — patch and remediation guide — diagnosis and fix on Oracle Linux 8

Oracle Linux 8 — curl — vulnerability — patch and remediation guide (ELSA-2021-4059)

🟡 Medium   ⏱ 10–30 min  Last verified: 2 November 2021 Affected versions: Oracle Linux 8 📖 ~4 min read  •  Source: ELSA advisory ELSA-2021-4059 Related CVEs: CVE-2021-22947 CVE-2021-22946 Table of contents Symptom & Impact Environment & Reproduction Root Cause Analysis Quick Triage Step-by-Step Diagnosis Solution – Primary Fix Solution – Alternative Approaches Verification & […]

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Gentoo Linux — net-proxy/privoxy — multiple vulnerabilities (15 CVEs) — patch and remediation guide — diagnosis and fix on Gentoo Linux

Gentoo Linux — net-proxy/privoxy — multiple vulnerabilities (15 CVEs) — patch and remediation guide

🟡 Medium   ⏱ 10–30 min  Last verified: 25 May 2026 Affected versions: Gentoo Linux 📖 ~4 min read  •  Source: Gentoo GLSA GLSA-202107-16 Related CVEs: CVE-2020-35502 CVE-2021-20209 CVE-2021-20210 CVE-2021-20211 CVE-2021-20212 CVE-2021-20213 CVE-2021-20214 CVE-2021-20215  +7 more Upstream summary: Multiple vulnerabilities have been discovered in privoxy. Please review the CVE identifiers referenced below for details. Table […]

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FreeBSD 13 — mariadb103-server — multiple vulnerabilities (20 CVEs) — patch and remediation guide — diagnosis and fix on FreeBSD 13

FreeBSD 13 — mariadb103-server — multiple vulnerabilities (20 CVEs) — patch and remediation guide

🟠 High   ⏱ 15–60 min  Last verified: 2 November 2021 Affected versions: FreeBSD 13 📖 ~4 min read  •  Source: FreeBSD VuXML VuXML topic: MariaDB — Nullpointer dereference Related CVEs: CVE-2016-9843 CVE-2018-0739 CVE-2018-25032 CVE-2018-2767 CVE-2018-3054 CVE-2018-3056 CVE-2018-3058 CVE-2018-3060  +12 more Upstream summary: The MariaDB project reports: MariaDB Server is vulnerable to Denial of Service. […]

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Oracle Linux 8 — kernel security, bug fix, and — enhancement update — new behaviour and fixes — diagnosis and fix on Oracle Linux 8

Oracle Linux 8 — kernel security, bug fix, and — enhancement update — new behaviour and fixes (ELSA-2022-0825)

🟠 High   ⏱ 15–60 min  Last verified: 1 November 2021 Affected versions: Oracle Linux 8 📖 ~4 min read  •  Source: ELSA advisory ELSA-2022-0825 Related CVEs: CVE-2022-0516 CVE-2022-0435 CVE-2022-0847 CVE-2022-22942 CVE-2022-0492 CVE-2021-4154 Table of contents Symptom & Impact Environment & Reproduction Root Cause Analysis Quick Triage Step-by-Step Diagnosis Solution – Primary Fix Solution – […]

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AlmaLinux 8 — atkmm — multiple vulnerabilities (12 CVEs) — patch and remediation guide — diagnosis and fix on AlmaLinux 8

AlmaLinux 8 — atkmm — multiple vulnerabilities (12 CVEs) — patch and remediation guide

🟡 Medium   ⏱ 10–30 min  Last verified: 25 May 2026 Affected versions: AlmaLinux 8 📖 ~4 min read  •  Source: AlmaLinux ALSA ALSA-2021:1586 Related CVEs: CVE-2019-13012 CVE-2020-13543 CVE-2020-13584 CVE-2020-16125 CVE-2020-9948 CVE-2020-9951 CVE-2020-9983 CVE-2021-1817  +4 more Upstream summary: GNOME is the default desktop environment of AlmaLinux. The following packages have been upgraded to a later […]

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Common Problems 121603

Debian 9: Docker daemon fails after kernel or cgroup changes

🟠 High   ⏱ 5–30 min  Last verified: 1 November 2021 Affected versions: Debian 9 📖 ~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 Monitor MySQL with Prometheus on FreeBSD 13 — step-by-step FreeBSD 13 tutorial on Progressive Robot

How to Monitor MySQL with Prometheus on FreeBSD 13

Introduction This guide explains how to Monitor MySQL with Prometheus 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 […]

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