Linux

Debian 11 — software-properties — multiple vulnerabilities (4 CVEs) — patch and remediation guide — diagnosis and fix on Debian 11

Debian 11 — software-properties — multiple vulnerabilities (4 CVEs) — patch and remediation guide

  • November 20, 2021
  • Linux
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🟡 Medium   ⏱ 10–30 min  Last verified: 20 November 2021 Affected versions: Debian 11 (bullseye) 📖 ~4 min read  •  Source: Debian Security Tracker Related CVEs: CVE-2011-4407 CVE-2012-0955 CVE-2013-1061 CVE-2020-15709 Upstream summary: ppa.py in Software Properties before 0.81.13.3 does not validate the server certificate when downloading PPA GPG key fingerprints, which allows man-in-the-middle (MITM) […]

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Ubuntu 20.04 — dojo — multiple vulnerabilities (4 CVEs) — patch and remediation guide — diagnosis and fix on Ubuntu 20.04

Ubuntu 20.04 — dojo — multiple vulnerabilities (4 CVEs) — patch and remediation guide

  • November 20, 2021
  • Linux
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🟡 Medium   ⏱ 10–30 min  Last verified: 20 November 2021 Affected versions: Ubuntu 20.04 (focal) 📖 ~4 min read  •  Source: Ubuntu Security Notice USN-7569-1 Related CVEs: CVE-2021-23450 CVE-2020-4051 CVE-2019-10785 CVE-2018-15494 Upstream summary: It was discovered that Dojo did not correctly handle DataGrids. An attacker could possibly use this issue to execute arbitrary code. […]

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How To Set Up a Firewall with UFW on Ubuntu 16.04 — step-by-step Linux tutorial on Progressive Robot

How To Set Up a Firewall with UFW on Ubuntu 16.04

  • November 20, 2021
  • Linux
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UFW, or Uncomplicated Firewall, is an interface to iptables that is geared towards simplifying the process of configuring a firewall. While iptables is a solid and flexible tool, it can be difficult for beginners to learn how to use it to properly configure a firewall. If you’re looking to get started securing your network, and you’re not sure which tool to use, UFW may be the right choice for you. This tutorial will show you how to set up a firewall with UFW on Ubuntu 16.04.

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

Oracle Linux 8 — freerdp — vulnerability — patch and remediation guide (ELSA-2021-4622)

  • November 20, 2021
  • Linux
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🟠 High   ⏱ 15–60 min  Last verified: 20 November 2021 Affected versions: Oracle Linux 8 📖 ~4 min read  •  Source: ELSA advisory ELSA-2021-4622 Related CVEs: CVE-2021-41160 CVE-2021-41159 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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How to Tune Linux Kernel Parameters with sysctl on RHEL 7 — step-by-step RHEL 7 tutorial on Progressive Robot

How to Tune Linux Kernel Parameters with sysctl on RHEL 7

  • November 20, 2021
  • Linux
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How to Tune Linux Kernel Parameters with sysctl on RHEL 7 The Linux kernel exposes hundreds of tunable parameters through the sysctl interface, allowing system administrators to adjust network behavior, memory management, file descriptor limits, and security policies without recompiling the kernel or rebooting. On Red Hat Enterprise Linux 7, these parameters are managed through […]

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Oracle Linux 8 — userspace graphics, xorg-x11, and mesa security, bug fix, and — enhancement update — new behaviour and fixes — diagnosis and fix on Oracle Linux 8

Oracle Linux 8 — userspace graphics, xorg-x11, and mesa security, bug fix, and — enhancement update — new behaviour and fixes (ELSA-2021-1804)

  • November 19, 2021
  • Linux
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🟡 Medium   ⏱ 10–30 min  Last verified: 19 November 2021 Affected versions: Oracle Linux 8 📖 ~4 min read  •  Source: ELSA advisory ELSA-2021-1804 Related CVEs: CVE-2020-14347 CVE-2020-25712 CVE-2020-14344 CVE-2020-14362 CVE-2020-14345 CVE-2020-14360 Table of contents Symptom & Impact Environment & Reproduction Root Cause Analysis Quick Triage Step-by-Step Diagnosis Solution – Primary Fix Solution – […]

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Alpine Linux edge — hostapd — multiple vulnerabilities (16 CVEs) — patch and remediation guide — diagnosis and fix on Alpine Linux edge

Alpine Linux edge — hostapd — multiple vulnerabilities (16 CVEs) — patch and remediation guide

  • November 19, 2021
  • Linux
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🟠 High   ⏱ 15–60 min  Last verified: 25 May 2026 Affected versions: Alpine Linux edge / fixed in 2.9-r3 📖 ~4 min read  •  Source: Alpine secdb entry — hostapd 2.9-r3 Related CVEs: CVE-2021-30004 CVE-2020-12695 CVE-2019-16275 CVE-2019-11555 CVE-2019-9496 CVE-2017-13077 CVE-2017-13078 CVE-2017-13079  +8 more Upstream summary: Alpine main repository for vedge ships hostapd 2.9-r3 which […]

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Common Problems 114911

RHEL 8 firewalld Blocking Application Port Despite Service Running

  • November 19, 2021
  • Linux
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🟡 Medium   ⏱ 5–30 min  Last verified: 19 November 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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