Security Hardening

AlmaLinux 8 — efivar — vulnerability — patch and remediation guide — diagnosis and fix on AlmaLinux 8

AlmaLinux 8 — efivar — vulnerability — patch and remediation guide

🟡 Medium   ⏱ 10–30 min  Last verified: 25 May 2026 Affected versions: AlmaLinux 8 📖 ~4 min read  •  Source: AlmaLinux ALSA ALEA-2020:4596 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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AlmaLinux 8 — postfix — vulnerability — patch and remediation guide — diagnosis and fix on AlmaLinux 8

AlmaLinux 8 — postfix — 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-2022:2091 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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FreeBSD 13 — libsrtp — vulnerability — patch and remediation guide — diagnosis and fix on FreeBSD 13

FreeBSD 13 — libsrtp — vulnerability — patch and remediation guide

🟢 Low   ⏱ 5–15 min  Last verified: 22 April 2021 Affected versions: FreeBSD 13 📖 ~4 min read  •  Source: FreeBSD VuXML VuXML topic: libsrtp — DoS via crafted RTP header vulnerability Related CVEs: CVE-2015-6360 Upstream summary: libsrtp reports: Prevent potential DoS attack due to lack of bounds checking on RTP header CSRC count […]

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FreeBSD 13 — openvpn-polarssl — multiple vulnerabilities (8 CVEs) — patch and remediation guide — diagnosis and fix on FreeBSD 13

FreeBSD 13 — openvpn-polarssl — multiple vulnerabilities (8 CVEs) — patch and remediation guide

🟡 Medium   ⏱ 10–30 min  Last verified: 22 April 2021 Affected versions: FreeBSD 13 📖 ~4 min read  •  Source: FreeBSD VuXML VuXML topic: OpenVPN — out-of-bounds write in legacy key-method 1 Related CVEs: CVE-2017-12166 CVE-2017-7478 CVE-2017-7479 CVE-2017-7508 CVE-2017-7512 CVE-2017-7520 CVE-2017-7521 CVE-2017-7522 Upstream summary: Steffan Karger reports: The bounds check in read_key() was performed […]

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FreeBSD 13 — mkvtoolnix — security advisory — patch and remediation guide — diagnosis and fix on FreeBSD 13

FreeBSD 13 — mkvtoolnix — security advisory — patch and remediation guide

🟢 Low   ⏱ 5–15 min  Last verified: 22 April 2021 Affected versions: FreeBSD 13 📖 ~4 min read  •  Source: FreeBSD VuXML VuXML topic: mkvtoolnix — code execution via specially crafted files Upstream summary: Moritz Bunkus reports: most of the bugs fixed on 2016-09-06 and 2016-09-07 for issue #1780 are potentially exploitable. The scenario […]

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FreeBSD 13 — rubygem-rack — multiple vulnerabilities (15 CVEs) — patch and remediation guide — diagnosis and fix on FreeBSD 13

FreeBSD 13 — rubygem-rack — multiple vulnerabilities (15 CVEs) — patch and remediation guide

🟠 High   ⏱ 15–60 min  Last verified: 22 April 2021 Affected versions: FreeBSD 13 📖 ~4 min read  •  Source: FreeBSD VuXML VuXML topic: rack — possible denial of service vulnerability in header parsing Related CVEs: CVE-2011-4815 CVE-2011-4838 CVE-2011-5036 CVE-2011-5037 CVE-2015-1840 CVE-2015-3224 CVE-2015-3225 CVE-2015-3226  +7 more Upstream summary: ooooooo_q reports: Carefully crafted input can […]

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AlmaLinux 8 — lz4 — multiple vulnerabilities (2 CVEs) — patch and remediation guide — diagnosis and fix on AlmaLinux 8

AlmaLinux 8 — lz4 — multiple vulnerabilities (2 CVEs) — patch and remediation guide

🟡 Medium   ⏱ 10–30 min  Last verified: 25 May 2026 Affected versions: AlmaLinux 8 📖 ~4 min read  •  Source: AlmaLinux ALSA ALSA-2025:11035 Related CVEs: CVE-2019-17543 CVE-2021-3520 Upstream summary: The lz4 packages provide support for LZ4, a very fast, lossless compression algorithm that provides compression speeds of 400 MB/s per core and scales with […]

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How to Set Up SSH Key-Based Authentication on RHEL 7 — step-by-step RHEL 7 tutorial on Progressive Robot

How to Set Up SSH Key-Based Authentication on RHEL 7

How to Set Up SSH Key-Based Authentication on RHEL 7 SSH key-based authentication replaces password logins with a cryptographic key pair: a private key that stays on your local machine and a public key that you install on the remote server. When you connect, the server challenges your SSH client to prove it holds the […]

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AlmaLinux 8 — jackson-module-jaxb-annotations — multiple vulnerabilities (17 CVEs) — patch and remediation guide — diagnosis and fix on AlmaLinux 8

AlmaLinux 8 — jackson-module-jaxb-annotations — multiple vulnerabilities (17 CVEs) — patch and remediation guide

🟠 High   ⏱ 15–60 min  Last verified: 25 May 2026 Affected versions: AlmaLinux 8 📖 ~4 min read  •  Source: AlmaLinux ALSA ALSA-2019:2720 Related CVEs: CVE-2019-12384 CVE-2018-11784 CVE-2018-8014 CVE-2018-8034 CVE-2018-8037 CVE-2019-14540 CVE-2019-16335 CVE-2019-16942  +9 more Upstream summary: The Public Key Infrastructure (PKI) Deps module contains fundamental packages required as dependencies for the pki-core module […]

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FreeBSD 13 — postfixadmin — multiple vulnerabilities (3 CVEs) — patch and remediation guide — diagnosis and fix on FreeBSD 13

FreeBSD 13 — postfixadmin — multiple vulnerabilities (3 CVEs) — patch and remediation guide

🟡 Medium   ⏱ 10–30 min  Last verified: 22 April 2021 Affected versions: FreeBSD 13 📖 ~4 min read  •  Source: FreeBSD VuXML VuXML topic: postfixadmin — SQL injection vulnerability Related CVEs: CVE-2012-0811 CVE-2012-0812 CVE-2014-2655 Upstream summary: Thijs Kinkhorst reports: Postfixadmin has an SQL injection vulnerability. This vulnerability is only exploitable by authenticated users able […]

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