Linux

Ubuntu 22.04 — apparmor — multiple vulnerabilities (2 CVEs) — patch and remediation guide — diagnosis and fix on Ubuntu 22.04

Ubuntu 22.04 — apparmor — multiple vulnerabilities (2 CVEs) — patch and remediation guide

  • April 11, 2023
  • Linux
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🟢 Low   ⏱ 5–15 min  Last verified: 11 April 2023 Affected versions: Ubuntu 22.04 (jammy) 📖 ~4 min read  •  Source: Ubuntu Security Notice USN-7035-1 Related CVEs: CVE-2016-1585 https://bugs.launchpad.net/apparmor/+bug/1597017 Upstream summary: It was discovered that the AppArmor policy compiler incorrectly generated looser restrictions than expected for rules allowing mount operations. A local attacker could […]

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Oracle Linux 9 — thunderbird — vulnerability — patch and remediation guide — diagnosis and fix on Oracle Linux 9

Oracle Linux 9 — thunderbird — vulnerability — patch and remediation guide (ELSA-2023-6191)

  • April 11, 2023
  • Linux
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🟠 High   ⏱ 15–60 min  Last verified: 11 April 2023 Affected versions: Oracle Linux 9 📖 ~4 min read  •  Source: ELSA advisory ELSA-2023-6191 Related CVEs: CVE-2023-5721 CVE-2023-5730 CVE-2023-5725 CVE-2023-5728 CVE-2023-5732 CVE-2023-44488 Table of contents Symptom & Impact Environment & Reproduction Root Cause Analysis Quick Triage Step-by-Step Diagnosis Solution – Primary Fix Solution – […]

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Oracle Linux 8 — subversion:1.10 — vulnerability — patch and remediation guide — diagnosis and fix on Oracle Linux 8

Oracle Linux 8 — subversion:1.10 — vulnerability — patch and remediation guide (ELSA-2022-2234)

  • April 11, 2023
  • Linux
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🟠 High   ⏱ 15–60 min  Last verified: 11 April 2023 Affected versions: Oracle Linux 8 📖 ~4 min read  •  Source: ELSA advisory ELSA-2022-2234 Related CVEs: CVE-2022-24070 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 Create a High-Availability Setup with Heartbeat and Reserved IPs on Ubuntu — step-by-step Linux tutorial on Progressive Robot

How To Create a High-Availability Setup with Heartbeat and Reserved IPs on Ubuntu

  • April 11, 2023
  • Linux
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Heartbeat is an open source program that provides cluster infrastructure capabilities—cluster membership and messaging—to client servers, which is a critical component in a high availability (HA) server infrastructure. Heartbeat is typically used in conjunction with a cluster resource manager (CRM), such as Pacemaker, to achieve a complete HA setup. However, in this tutorial, we will demonstrate how to create a 2-node HA server setup by simply using Heartbeat and a the cloud provider Reserved IP.

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Oracle Linux 9 — rsync — security and stability fixes — required update — diagnosis and fix on Oracle Linux 9

Oracle Linux 9 — rsync — security and stability fixes — required update (ELSA-2022-8291)

  • April 10, 2023
  • Linux
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🟡 Medium   ⏱ 10–30 min  Last verified: 10 April 2023 Affected versions: Oracle Linux 9 📖 ~4 min read  •  Source: ELSA advisory ELSA-2022-8291 Related CVEs: CVE-2022-37434 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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Common Problems 118916

Ubuntu 14.04 LTS apt-get Update Fails with Hash Sum Mismatch

  • April 10, 2023
  • Linux
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🟡 Medium   ⏱ 5–30 min  Last verified: 10 April 2023 📖 ~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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AlmaLinux 9 — libfastjson — vulnerability — patch and remediation guide — diagnosis and fix on AlmaLinux 9

AlmaLinux 9 — libfastjson — vulnerability — patch and remediation guide

  • April 10, 2023
  • Linux
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🟡 Medium   ⏱ 10–30 min  Last verified: 25 May 2026 Affected versions: AlmaLinux 9 📖 ~4 min read  •  Source: AlmaLinux ALSA ALSA-2023:6431 Related CVEs: CVE-2020-12762 Upstream summary: The libfastjson library provides essential JavaScript Object Notation (JSON) handling functions. The library enables users to construct JSON objects in C, output them as JSON-formatted strings, […]

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Alpine Linux edge — lighthouse — multiple vulnerabilities (5 CVEs) — patch and remediation guide — diagnosis and fix on Alpine Linux edge

Alpine Linux edge — lighthouse — multiple vulnerabilities (5 CVEs) — patch and remediation guide

  • April 10, 2023
  • Linux
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🟠 High   ⏱ 15–60 min  Last verified: 25 May 2026 Affected versions: Alpine Linux edge / fixed in 8.1.2-r0 📖 ~4 min read  •  Source: Alpine secdb entry — lighthouse 8.1.2-r0 Related CVEs: GHSA-vxx9-2994-q338 GHSA-gc42-3jg7-rxr2 GHSA-6xvm-j4wr-6v98 GHSA-4w32-2493-32g7 CVE-2022-0778 Upstream summary: Alpine community repository for vedge ships lighthouse 8.1.2-r0 which addresses GHSA-vxx9-2994-q338. Table of contents […]

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