Linux

Ubuntu 20.04 — libnet-cidr-lite-perl — vulnerability — patch and remediation guide — diagnosis and fix on Ubuntu 20.04

Ubuntu 20.04 — libnet-cidr-lite-perl — vulnerability — patch and remediation guide

🟢 Low   ⏱ 5–15 min  Last verified: 26 July 2021 Affected versions: Ubuntu 20.04 (focal) 📖 ~4 min read  •  Source: Ubuntu Security Notice USN-6712-1 Related CVEs: CVE-2021-47154 Upstream summary: It was discovered that Net::CIDR::Lite incorrectly handled extra zero characters at the beginning of IP address strings. A remote attacker could possibly use this […]

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openSUSE Tumbleweed — colord — multiple vulnerabilities (2 CVEs) — patch and remediation guide — diagnosis and fix on openSUSE Tumbleweed

openSUSE Tumbleweed — colord — multiple vulnerabilities (2 CVEs) — patch and remediation guide

🟡 Medium   ⏱ 10–30 min  Last verified: 25 May 2026 Affected versions: openSUSE Tumbleweed 📖 ~4 min read  •  Source: SUSE advisory SUSE-SU-2022:3496-1 (see also SUSE bugzilla) Related CVEs: CVE-2021-42523 CVE-2011-4349 Upstream summary: There are two Information Disclosure vulnerabilities in colord, and they lie in colord/src/cd-device-db.c and colord/src/cd-profile-db.c separately. They exist because the 'err_msg' […]

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Ubuntu 14.04 — gmp — vulnerability — patch and remediation guide — diagnosis and fix on Ubuntu 14.04

Ubuntu 14.04 — gmp — vulnerability — patch and remediation guide

🟢 Low   ⏱ 5–15 min  Last verified: 26 July 2021 Affected versions: Ubuntu 14.04 (trusty) 📖 ~4 min read  •  Source: Ubuntu Security Notice USN-5672-2 Related CVEs: CVE-2021-43618 Upstream summary: USN-5672-1 fixed a vulnerability in GMP. This update provides the corresponsing update for Ubuntu 14.04 ESM. Original advisory details: It was discovered that GMP […]

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SLES 12 — libgmp10 — vulnerability — patch and remediation guide — diagnosis and fix on SLES 12

SLES 12 — libgmp10 — vulnerability — patch and remediation guide

🟡 Medium   ⏱ 10–30 min  Last verified: 26 July 2021 Affected versions: SLES 12 📖 ~4 min read  •  Source: SUSE advisory SUSE-CU-2021:541-1 (see also SUSE bugzilla) Related CVEs: CVE-2021-43618 Upstream summary: GNU Multiple Precision Arithmetic Library (GMP) through 6.2.1 has an mpz/inp_raw.c integer overflow and resultant buffer overflow via crafted input, leading to […]

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

Oracle Linux 8 — stunnel — vulnerability — patch and remediation guide (ELSA-2021-0618)

🟠 High   ⏱ 15–60 min  Last verified: 26 July 2021 Affected versions: Oracle Linux 8 📖 ~4 min read  •  Source: ELSA advisory ELSA-2021-0618 Related CVEs: CVE-2021-20230 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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Oracle Linux 8 — cloud-init security, bug fix, and — enhancement update — new behaviour and fixes — diagnosis and fix on Oracle Linux 8

Oracle Linux 8 — cloud-init security, bug fix, and — enhancement update — new behaviour and fixes (ELSA-2020-4650)

🟡 Medium   ⏱ 10–30 min  Last verified: 25 July 2021 Affected versions: Oracle Linux 8 📖 ~4 min read  •  Source: ELSA advisory ELSA-2020-4650 Related CVEs: CVE-2020-8631 CVE-2020-8632 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 Set Up a Firewall Using Iptables on Ubuntu 12.04 — step-by-step Linux tutorial on Progressive Robot

How To Set Up a Firewall Using Iptables on Ubuntu 12.04

This tutorial covers setting up a very simple firewall with iptables on an ubuntu droplet. The iptables rules come from a series of options that can be combined to create each specific process. Each packet that crossing the firewall is checked by each rule in order. As soon as it matches a rule, the packet follows the associated action, otherwise it proceeds down the line. Many of the rules in the article should be copy and pastable.

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