How to Configure SELinux on RHEL 7 SELinux (Security-Enhanced Linux) is a mandatory access control (MAC) system built into the Linux kernel and enabled by default on every RHEL 7 installation. Unlike traditional Unix discretionary access control (DAC), which lets file owners decide who can access their files, SELinux enforces a policy defined by the […]
How to Set Up DNS Forwarders on Windows Server 2012 R2 DNS forwarders direct queries for domains that a DNS server cannot resolve locally to another DNS server that may be able to answer them. Configuring forwarders correctly is essential for efficient DNS resolution in enterprise environments, reducing resolution time for external names, enabling split-brain […]
🟢 Low ⏱ 5–15 min Last verified: 25 February 2020 Affected versions: FreeBSD 12 📖 ~4 min read • Source: FreeBSD VuXML VuXML topic: cfengine — arbitrary file overwriting vulnerability Related CVEs: CVE-2005-2960 Upstream summary: A Debian Security Advisory reports: Javier Fernández-Sanguino Peña discovered several insecure temporary file uses in cfengine, a tool for […]
🟢 Low ⏱ 5–15 min Last verified: 25 February 2020 Affected versions: Ubuntu 16.04 (xenial) 📖 ~4 min read • Source: Ubuntu Security Notice USN-4520-1 Related CVEs: CVE-2019-19920 Upstream summary: It was discovered that Exim SpamAssassin does not properly handle configuration strings. An attacker could possibly use this issue to execute arbitrary code. (CVE-2019-19920) […]
Port knocking is a stealthy technique that keeps SSH’s port 22 invisible to network scanners until a client sends a precise sequence of connection attempts to predetermined ports. On RHEL 8, combining knockd with firewalld creates a powerful two-layer defense: the firewall silently drops all traffic on port 22 by default, and only the knock […]
🟠 High ⏱ 15–60 min Last verified: 25 February 2020 Affected versions: Oracle Linux 8 📖 ~4 min read • Source: ELSA advisory ELSA-2020-1513 Related CVEs: CVE-2020-5260 Table of contents Symptom & Impact Environment & Reproduction Root Cause Analysis Quick Triage Step-by-Step Diagnosis Solution – Primary Fix Solution – Alternative Approaches Verification & Acceptance […]
🟠 High ⏱ 5–30 min Last verified: 24 February 2020 Affected versions: Ubuntu 16.04 LTS 📖 ~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 […]
🟢 Low ⏱ 5–15 min Last verified: 24 February 2020 Affected versions: FreeBSD 12 📖 ~4 min read • Source: FreeBSD VuXML VuXML topic: PyYAML — arbitrary code execution Related CVEs: CVE-2020-14343 Upstream summary: A vulnerability was discovered in the PyYAML library in versions before 5.4, where it is susceptible to arbitrary code execution […]
Introduction IBM AIX 7.1 is the latest release of IBM’s enterprise-grade UNIX operating system, running on IBM Power Systems hardware. Known for its reliability, security, and performance in mission-critical environments, AIX 7.1 introduces enhanced virtualization, security hardening, and cloud integration features. This guide covers how to use sar for system activity reporting on ibm aix […]
🟢 Low ⏱ 5–15 min Last verified: 24 February 2020 Affected versions: FreeBSD 12 📖 ~4 min read • Source: FreeBSD VuXML VuXML topic: krfb — Multiple security issues in bundled libvncserver Related CVEs: CVE-2014-4607 CVE-2014-6055 Upstream summary: Martin Sandsmark reports: krfb 4.14 [and earlier] embeds libvncserver which has had several security issues. Several […]
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