PXE (Preboot eXecution Environment) boot lets you install an operating system over the network without a physical USB drive or DVD. On RHEL 8 this capability is built from three cooperating services: a DHCP server that hands out IP addresses and points new clients to the boot server, a TFTP server that delivers the initial […]
🟡 Medium ⏱ 10–30 min Last verified: 13 March 2022 Affected versions: Oracle Linux 8 📖 ~4 min read • Source: ELSA advisory ELSA-2021-2595 Related CVEs: CVE-2021-3514 Table of contents Symptom & Impact Environment & Reproduction Root Cause Analysis Quick Triage Step-by-Step Diagnosis Solution – Primary Fix Solution – Alternative Approaches Verification & Acceptance […]
🟡 Medium ⏱ 10–30 min Last verified: 25 May 2026 Affected versions: AlmaLinux 8 📖 ~4 min read • Source: AlmaLinux ALSA ALBA-2020:1846 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 […]
Introduction CentOS Stream 9 ships with a stable, security-hardened base that makes deploying configure ssh key authentication on centos stream 9 both straightforward and auditable. This tutorial covers the complete procedure for how to Configure SSH Key Authentication on CentOS Stream 9, including dnf module streams where applicable, systemd unit management, and the firewalld rules […]
🔴 Critical ⏱ 5–30 min Last verified: 13 March 2022 Affected versions: Debian 11 📖 ~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 & […]
🟡 Medium ⏱ 10–30 min Last verified: 25 May 2026 Affected versions: Alpine Linux edge / fixed in 0.16.1-r0 📖 ~4 min read • Source: Alpine secdb entry — swayr 0.16.1-r0 Related CVEs: CVE-2022-24713 Upstream summary: Alpine community repository for vedge ships swayr 0.16.1-r0 which addresses CVE-2022-24713. Table of contents Symptom & Impact Environment […]
Introduction How to Enable SSL/TLS with Let’s Encrypt on Apache2 on Debian 9 is a fundamental operation for any administrator maintaining a Debian 9 Stretch server. Debian 9 Stretch ships with the Linux 6.12 kernel, updated toolchains, and a fully refreshed package archive — meaning version numbers, configuration file paths, and some dependency chains differ […]
🟢 Low ⏱ 5–15 min Last verified: 13 March 2022 Affected versions: Debian 11 (bullseye) 📖 ~4 min read • Source: Debian Security Tracker Related CVEs: CVE-2014-9862 CVE-2020-14315 Upstream summary: Integer signedness error in bspatch.c in bspatch in bsdiff, as used in Apple OS X before 10.11.6 and other products, allows remote attackers to […]
🟡 Medium ⏱ 10–30 min Last verified: 25 May 2026 Affected versions: Amazon Linux 2 📖 ~4 min read • Source: Amazon Linux advisory ALAS2-2023-2173 Related CVEs: CVE-2020-21682 CVE-2021-32280 CVE-2021-3561 CVE-2019-19746 CVE-2019-19797 Upstream summary: 2023-08-03: CVE-2021-32280 was added to this advisory. A global buffer overflow in the set_fill component in genge.c of fig2dev 3.2.7b […]
The mod_evasive Apache module, formerly known as mod_dosevasive, helps protect against DoS, DDoS (Distributed Denial of Service), and brute force attacks on the Apache web server. It can provide evasive action during attacks and report abuses via email and syslog facilities.
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