Security Hardening

Common Problems 114117

RHEL 10 – Postfix starts but mail remains deferred due to SELinux policy denial – Fix & Prevention

🟠 High   ⏱ 5–30 min  Last verified: 16 November 2025 Affected versions: RHEL 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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Ubuntu 22.04 — node-sha.js — vulnerability — patch and remediation guide — diagnosis and fix on Ubuntu 22.04

Ubuntu 22.04 — node-sha.js — vulnerability — patch and remediation guide

🟢 Low   ⏱ 5–15 min  Last verified: 16 November 2025 Affected versions: Ubuntu 22.04 (jammy) 📖 ~4 min read  •  Source: Ubuntu Security Notice USN-7778-1 Related CVEs: CVE-2025-9288 Upstream summary: Nikita Skovoroda discovered that sha.js did not properly handle certain inputs. An attacker could possibly use this issue to manipulate the internal state of […]

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Ubuntu 22.04 — simgear — vulnerability — patch and remediation guide — diagnosis and fix on Ubuntu 22.04

Ubuntu 22.04 — simgear — vulnerability — patch and remediation guide

🟢 Low   ⏱ 5–15 min  Last verified: 16 November 2025 Affected versions: Ubuntu 22.04 (jammy) 📖 ~4 min read  •  Source: Ubuntu Security Notice USN-7965-1 Related CVEs: CVE-2025-0781 Upstream summary: It was discovered that SimGear could be made to bypass the sandboxing of Nasal scripts. An attacker could possibly use this issue to execute […]

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Ubuntu 22.04 — erlang — multiple vulnerabilities (10 CVEs) — patch and remediation guide — diagnosis and fix on Ubuntu 22.04

Ubuntu 22.04 — erlang — multiple vulnerabilities (10 CVEs) — patch and remediation guide

🟠 High   ⏱ 15–60 min  Last verified: 16 November 2025 Affected versions: Ubuntu 22.04 (jammy) 📖 ~4 min read  •  Source: Ubuntu Security Notice USN-7831-1 Related CVEs: CVE-2025-48041 CVE-2025-48038 CVE-2025-48040 CVE-2025-48039 CVE-2025-46712 CVE-2025-4748 CVE-2025-32433 CVE-2025-30211  +2 more Upstream summary: It was discovered that Erlang incorrectly handled resource allocation and consumption in the SFTP SSH […]

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Red Hat Enterprise Linux 8 — gnupg2 — vulnerability — patch and remediation guide — diagnosis and fix on Red Hat Enterprise Linux 8

Red Hat Enterprise Linux 8 — gnupg2 — vulnerability — patch and remediation guide

🟠 High   ⏱ 15–60 min  Last verified: 25 May 2026 Affected versions: Red Hat Enterprise Linux 8 📖 ~4 min read  •  Source: Red Hat advisory RHSA RHSA-2026:1468 Related CVEs: CVE-2025-68973 Table of contents Symptom & Impact Environment & Reproduction Root Cause Analysis Quick Triage Step-by-Step Diagnosis Solution – Primary Fix Solution – Alternative […]

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How to Enable Brotli Compression in Nginx on SLES 16 — step-by-step SUSE Linux Enterprise 16 tutorial on Progressive Robot

How to Enable Brotli Compression in Nginx on SLES 16

Introduction This tutorial covers How to Enable Brotli Compression in Nginx on SLES 16 on SLES 16. SLES 16 (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 16 system is up to date: […]

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SLES 16 — python313-Pygments — multiple vulnerabilities (2 CVEs) — patch and remediation guide — diagnosis and fix on SLES 16

SLES 16 — python313-Pygments — multiple vulnerabilities (2 CVEs) — patch and remediation guide

🟠 High   ⏱ 15–60 min  Last verified: 16 November 2025 Affected versions: SLES 16 📖 ~4 min read  •  Source: SUSE advisory SUSE-SU-2021:1500-1 (see also SUSE bugzilla) Related CVEs: CVE-2021-20270 CVE-2021-27291 Upstream summary: An infinite loop in SMLLexer in Pygments versions 1.5 to 2.7.3 may lead to denial of service when performing syntax highlighting […]

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SLES 16 — opensc — multiple vulnerabilities (20 CVEs) — patch and remediation guide — diagnosis and fix on SLES 16

SLES 16 — opensc — multiple vulnerabilities (20 CVEs) — patch and remediation guide

🟠 High   ⏱ 15–60 min  Last verified: 16 November 2025 Affected versions: SLES 16 📖 ~4 min read  •  Source: SUSE advisory SUSE-SU-2021:3582-1 (see also SUSE bugzilla) Related CVEs: CVE-2021-42781 CVE-2021-42782 CVE-2023-40660 CVE-2008-2235 CVE-2009-0368 CVE-2010-4523 CVE-2018-16391 CVE-2018-16392  +12 more Upstream summary: Heap buffer overflow issues were found in Opensc before version 0.22.0 in pkcs15-oberthur.c […]

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SLES 15 — go1.22 — multiple vulnerabilities (7 CVEs) — patch and remediation guide — diagnosis and fix on SLES 15

SLES 15 — go1.22 — multiple vulnerabilities (7 CVEs) — patch and remediation guide

🟡 Medium   ⏱ 10–30 min  Last verified: 16 November 2025 Affected versions: SLES 15 📖 ~4 min read  •  Source: SUSE advisory SUSE-SU-2025:01731-1 (see also SUSE bugzilla) Related CVEs: CVE-2025-22866 CVE-2024-45336 CVE-2024-45341 CVE-2024-34155 CVE-2024-34156 CVE-2024-34158 CVE-2024-24788 Upstream summary: Due to the usage of a variable time instruction in the assembly implementation of an internal […]

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How to Manage Storage with Parted on SLES 16 — step-by-step SUSE Linux Enterprise 16 tutorial on Progressive Robot

How to Manage Storage with Parted on SLES 16

Introduction This tutorial covers How to Manage Storage with Parted on SLES 16 on SLES 16. SLES 16 (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 16 system is up to date: zypper […]

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