Linux

Common Problems 121003

Debian 10: SSH access denied after sshd Match rule change

🔴 Critical   ⏱ 5–30 min  Last verified: 4 June 2020 Affected versions: Debian 10 📖 ~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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openSUSE Tumbleweed — python36-bottle — vulnerability — patch and remediation guide — diagnosis and fix on openSUSE Tumbleweed

openSUSE Tumbleweed — python36-bottle — vulnerability — patch and remediation guide

🟡 Medium   ⏱ 10–30 min  Last verified: 25 May 2026 Affected versions: openSUSE Tumbleweed 📖 ~4 min read  •  Source: SUSE security advisory Related CVEs: CVE-2016-9964 Upstream summary: redirect() in bottle.py in bottle 0.12.10 doesn't filter a "rn" sequence, which leads to a CRLF attack, as demonstrated by a redirect("233rnSet-Cookie: name=salt") call. Table of […]

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Common Problems 118481

Ubuntu 16.04 LTS – apt update fails with Hash Sum mismatch – Fix & Prevention

🟡 Medium   ⏱ 5–30 min  Last verified: 4 June 2020 Affected versions: Ubuntu 16.04 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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Common Problems 117414

Ubuntu 20.04 LTS DNS Resolution Failure with systemd-resolved

🟡 Medium   ⏱ 5–30 min  Last verified: 4 June 2020 📖 ~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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Debian 9 — openldap — vulnerability — patch and remediation guide — diagnosis and fix on Debian 9

Debian 9 — openldap — vulnerability — patch and remediation guide

🟢 Low   ⏱ 5–15 min  Last verified: 4 June 2020 Affected versions: Debian 9 (stretch) 📖 ~4 min read  •  Source: Debian Security Tracker Related CVEs: CVE-2020-12243 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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How to Configure Redis Sentinel on Debian 10 — step-by-step Debian 10 tutorial on Progressive Robot

How to Configure Redis Sentinel on Debian 10

Introduction Debian 10 Buster is built around the ethos of stability and free software. Setting up configure redis sentinel on debian 10 on Buster leverages the same proven Debian packaging system that powers millions of servers worldwide, while benefiting from the latest upstream releases included in the Buster freeze. Follow each step carefully and the […]

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Como Gerenciar Strings no Redis — step-by-step Linux tutorial on Progressive Robot

Como Gerenciar Strings no Redis

O Redis é um datastore ou armazenamento de dados open-source de chave-valor na memória. No Redis, strings são o tipo mais básico de valor que você pode criar e gerenciar. Este tutorial fornece uma visão geral…

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Debian 9 — ibus — vulnerability — patch and remediation guide — diagnosis and fix on Debian 9

Debian 9 — ibus — vulnerability — patch and remediation guide

🟢 Low   ⏱ 5–15 min  Last verified: 4 June 2020 Affected versions: Debian 9 (stretch) 📖 ~4 min read  •  Source: Debian Security Tracker Related CVEs: CVE-2019-14822 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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Ubuntu 14.04 — wget — multiple vulnerabilities (9 CVEs) — patch and remediation guide — diagnosis and fix on Ubuntu 14.04

Ubuntu 14.04 — wget — multiple vulnerabilities (9 CVEs) — patch and remediation guide

🟡 Medium   ⏱ 10–30 min  Last verified: 4 June 2020 Affected versions: Ubuntu 14.04 (trusty) 📖 ~4 min read  •  Source: Ubuntu Security Notice USN-3943-1 Related CVEs: CVE-2018-20483 CVE-2019-5953 CVE-2018-0494 CVE-2016-7098 CVE-2017-13089 CVE-2017-13090 CVE-2017-6508 CVE-2016-4971  +1 more Upstream summary: It was discovered that Wget incorrectly handled certain inputs. An attacker could possibly use this […]

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

Oracle Linux 8 — pango — vulnerability — patch and remediation guide (ELSA-2019-2582)

🟠 High   ⏱ 15–60 min  Last verified: 4 June 2020 Affected versions: Oracle Linux 8 📖 ~4 min read  •  Source: ELSA advisory ELSA-2019-2582 Related CVEs: CVE-2019-1010238 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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