Troubleshooting

Common Problems 117949

Ubuntu 18.04 LTS SSH Login Fails with Permission Denied

🟠 High   ⏱ 5–30 min  Last verified: 29 April 2021 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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FreeBSD 13 — py26-graphite-web — vulnerability — patch and remediation guide — diagnosis and fix on FreeBSD 13

FreeBSD 13 — py26-graphite-web — vulnerability — patch and remediation guide

🟢 Low   ⏱ 5–15 min  Last verified: 29 April 2021 Affected versions: FreeBSD 13 📖 ~4 min read  •  Source: FreeBSD VuXML VuXML topic: py-graphite-web — Multiple vulnerabilities Related CVEs: CVE-2013-5093 Upstream summary: Graphite developers report: This release contains several security fixes for cross-site scripting (XSS) as well as a fix for a remote-execution […]

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How to Set Up ModSecurity WAF on SLES 12 — step-by-step SUSE Linux Enterprise 12 tutorial on Progressive Robot

How to Set Up ModSecurity WAF on SLES 12

Introduction This tutorial covers How to Set Up ModSecurity WAF on SLES 12 on SLES 12. SLES 12 (SUSE Linux Enterprise Server 16) is SUSE’s enterprise-grade Linux distribution. It uses the zypper package manager, AppArmor for mandatory access control, and systemctl for service management. Prerequisites Ensure your SLES 12 system is up to date: zypper […]

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AlmaLinux 8 — spacewalk-abrt — vulnerability — patch and remediation guide — diagnosis and fix on AlmaLinux 8

AlmaLinux 8 — spacewalk-abrt — vulnerability — patch and remediation guide

🟡 Medium   ⏱ 10–30 min  Last verified: 25 May 2026 Affected versions: AlmaLinux 8 📖 ~4 min read  •  Source: AlmaLinux ALSA ALBA-2019:3355 Upstream summary: For detailed information on changes in this release, see the AlmaLinux Release Notes linked from the References section. Table of contents Symptom & Impact Environment & Reproduction Root Cause […]

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Common Problems 117504

Ubuntu 20.04 LTS SSH Permission Denied Publickey

🟡 Medium   ⏱ 5–30 min  Last verified: 29 April 2021 📖 ~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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Ubuntu 14.04 — sympa — multiple vulnerabilities (3 CVEs) — patch and remediation guide — diagnosis and fix on Ubuntu 14.04

Ubuntu 14.04 — sympa — multiple vulnerabilities (3 CVEs) — patch and remediation guide

🟡 Medium   ⏱ 10–30 min  Last verified: 29 April 2021 Affected versions: Ubuntu 14.04 (trusty) 📖 ~4 min read  •  Source: Ubuntu Security Notice USN-4442-1 Related CVEs: CVE-2018-1000550 CVE-2018-1000671 CVE-2020-10936 Upstream summary: Michael Kaczmarczik discovered that Sympa incorrectly handled HTTP GET/POST requests. An attacker could possibly use this issue to insert, edit or obtain […]

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Ubuntu 18.04 — python-rsa — vulnerability — patch and remediation guide — diagnosis and fix on Ubuntu 18.04

Ubuntu 18.04 — python-rsa — vulnerability — patch and remediation guide

🟢 Low   ⏱ 5–15 min  Last verified: 29 April 2021 Affected versions: Ubuntu 18.04 (bionic) 📖 ~4 min read  •  Source: Ubuntu Security Notice USN-4478-2 Related CVEs: CVE-2020-13757 Upstream summary: USN-4478-1 fixed a vulnerability in Python-RSA. This update provides the corresponding update for Ubuntu 16.04 ESM, Ubuntu 18.04 ESM and Ubuntu 20.04 ESM. Original […]

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SLES 12 — squashfs — multiple vulnerabilities (6 CVEs) — patch and remediation guide — diagnosis and fix on SLES 12

SLES 12 — squashfs — multiple vulnerabilities (6 CVEs) — patch and remediation guide

🟡 Medium   ⏱ 10–30 min  Last verified: 29 April 2021 Affected versions: SLES 12 📖 ~4 min read  •  Source: SUSE advisory SUSE-SU-2023:4424-1 (see also SUSE bugzilla) Related CVEs: CVE-2015-4645 CVE-2015-4646 CVE-2021-40153 CVE-2021-41072 CVE-2012-4025 CVE-2012-4024 Upstream summary: Integer overflow in the read_fragment_table_4 function in unsquash-4.c in Squashfs and sasquatch allows remote attackers to cause […]

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SLES 15 — jackson-core — multiple vulnerabilities (3 CVEs) — patch and remediation guide — diagnosis and fix on SLES 15

SLES 15 — jackson-core — multiple vulnerabilities (3 CVEs) — patch and remediation guide

🟠 High   ⏱ 15–60 min  Last verified: 29 April 2021 Affected versions: SLES 15 📖 ~4 min read  •  Source: SUSE advisory SUSE-SU-2022:1678-1 (see also SUSE bugzilla) Related CVEs: CVE-2020-28491 CVE-2020-36518 CVE-2020-25649 Upstream summary: This affects the package com.fasterxml.jackson.dataformat:jackson-dataformat-cbor from 0 and before 2.11.4, from 2.12.0-rc1 and before 2.12.1. Unchecked allocation of byte buffer […]

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How to Configure Oracle Linux 8 in Google Cloud — step-by-step Oracle Linux 8 tutorial on Progressive Robot

How to Configure Oracle Linux 8 in Google Cloud

Introduction Oracle Linux 8 ships with a stable, security-hardened base that makes deploying configure oracle linux 8 in google cloud both straightforward and auditable. This tutorial covers the complete procedure for how to Configure Oracle Linux 8 in Google Cloud, including dnf module streams where applicable, systemd unit management, and the firewalld rules required for […]

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