How to Set Up Port Knocking for SSH on RHEL 7 Port knocking is a stealthy technique for controlling access to network services by requiring a client to send connection attempts to a predefined sequence of closed ports before a firewall rule opens the target port. When applied to SSH, it effectively hides port 22 […]
🟠 High ⏱ 15–60 min Last verified: 29 March 2021 Affected versions: Oracle Linux 8 📖 ~4 min read • Source: ELSA advisory ELSA-2021-2170 Related CVEs: CVE-2021-27219 Table of contents Symptom & Impact Environment & Reproduction Root Cause Analysis Quick Triage Step-by-Step Diagnosis Solution – Primary Fix Solution – Alternative Approaches Verification & Acceptance […]
🟢 Low ⏱ 5–15 min Last verified: 29 March 2021 Affected versions: FreeBSD 12 📖 ~4 min read • Source: FreeBSD VuXML VuXML topic: aiohttp — open redirect vulnerability Related CVEs: CVE-2021-21330 Upstream summary: Sviatoslav Sydorenko reports: Open redirect vulnerability — a maliciously crafted link to an aiohttp-based web-server could redirect the browser to […]
Introduction How to Use Podman Compose on Oracle Linux 8 on Oracle Linux 8 provides administrators with a robust, enterprise-ready workflow that integrates cleanly with systemd, SELinux, firewalld, and the modern AppStream module system. In this tutorial we will walk through every step required, from package installation to verification, so that the resulting configuration is […]
🟡 Medium ⏱ 10–30 min Last verified: 29 March 2021 Affected versions: Ubuntu 14.04 (trusty) 📖 ~4 min read • Source: Ubuntu Security Notice USN-5990-1 Related CVEs: CVE-2019-14697 CVE-2020-28928 CVE-2014-3484 CVE-2015-1817 CVE-2016-8859 CVE-2017-15650 CVE-2018-1000001 Upstream summary: It was discovered that musl did not handle certain i386 math functions properly. An attacker could use this […]
🔴 Critical ⏱ 30–120 min Last verified: 25 May 2026 Affected versions: VMware ESXi 7.0 📖 ~4 min read • Source: VMware advisory VMSA-2021-0002 Related CVEs: CVE-2020-3992 CVE-2021-21974 Fixed image profile / build: ESXi670-202102401-SG Upstream summary: ESXi contains a heap-overflow vulnerability in the OpenSLP service (CVE-2020-3992 / CVE-2021-21974) that allows a malicious actor residing […]
Introduction Deploying install apache kafka on freebsd 12 on a FreeBSD 12 machine differs from Linux in several important ways: packages come from the FreeBSD Ports Collection or the binary pkg repository, services are registered in /etc/rc.conf via sysrc(8), and firewall rules are written in pf.conf(5) syntax. This tutorial stays entirely within the standard base […]
🟠 High ⏱ 15–60 min Last verified: 29 March 2021 Affected versions: Ubuntu 20.04 (focal) 📖 ~4 min read • Source: Ubuntu Security Notice USN-5050-1 Related CVEs: CVE-2020-26558 CVE-2021-0129 CVE-2021-28691 CVE-2021-3564 CVE-2021-3573 CVE-2021-38208 CVE-2021-23134 CVE-2021-32399 +12 more Upstream summary: It was discovered that the bluetooth subsystem in the Linux kernel did not properly perform […]
🟠 High ⏱ 30–90 min Last verified: 29 March 2021 Affected versions: IBM AIX 7.2 📖 ~4 min read • Source: NVD CVE-2021-29725, IBM Support Bulletin CVE: CVE-2021-29725 NVD summary: IBM Secure External Authentication Server 2.4.3.2, 6.0.1, 6.0.2 and IBM Secure Proxy 3.4.3.2, 6.0.1, 6.0.2 could allow a remote user to consume resources causing […]
🟡 Medium ⏱ 5–30 min Last verified: 28 March 2021 Affected versions: Oracle Linux 8 📖 ~3 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 […]
