How To Scale and Crop Images with CSS object-fit
Learn how to use CSS object-fit to scale, crop, and position images responsively without distorting aspect ratios, plus a comparison with background-size.
Amazon Linux 2 — openldap — multiple vulnerabilities (18 CVEs) — patch and remediation guide
đź”´ Critical ⏱ 15–90 min Last verified: 25 May 2026 Affected versions: Amazon Linux 2 đź“– ~4 min read • Source: Amazon Linux advisory ALAS2-2022-1796 Related CVEs: CVE-2022-29155 CVE-2019-13565 CVE-2020-36221 CVE-2020-36222 CVE-2020-36223 CVE-2020-36224 CVE-2020-36226 CVE-2020-36227 +10 more Upstream summary: In OpenLDAP 2.x before 2.5.12 and 2.6.x before 2.6.2, a SQL injection vulnerability exists in […]
Oracle Linux 9 — python3.11 — vulnerability — patch and remediation guide (ELSA-2023-6494)
🟡 Medium ⏱ 10–30 min Last verified: 18 May 2023 Affected versions: Oracle Linux 9 đź“– ~4 min read • Source: ELSA advisory ELSA-2023-6494 Related CVEs: CVE-2023-41105 CVE-2007-4559 Table of contents Symptom & Impact Environment & Reproduction Root Cause Analysis Quick Triage Step-by-Step Diagnosis Solution – Primary Fix Solution – Alternative Approaches Verification & […]
Composition in Java Example
Composition in java is the design technique to implement has-a relationship in classes. We can use [java inheritance](/community/tutorials/inheritance-java-example "Inheritance in Java Example") or Object composition in java for code reuse. Composition in Java  Java composition is achieved by using instance variables that refers to other objects. For […]
How to Configure the Firewall on RHEL 8
RHEL 8 ships with firewalld as its default firewall management layer, replacing the older iptables static ruleset approach with a dynamic, zone-based model. Zones define the level of trust assigned to network interfaces and traffic sources, and rules can be added or removed at runtime without flushing the entire ruleset. This guide covers the essential […]
Oracle Linux 9 – Common Problem 006 – Diagnosis and Fix
🟡 Medium ⏱ 5–30 min Last verified: 17 May 2023 Affected versions: Oracle Linux 9 đź“– ~2 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 […]
IBM AIX 7.3 — CVE-2020-4591 — vulnerability — patch and remediation guide
🟢 Low ⏱ 10–30 min Last verified: 17 May 2023 Affected versions: IBM AIX 7.3 đź“– ~4 min read • Source: NVD CVE-2020-4591, IBM Support Bulletin CVE: CVE-2020-4591 NVD summary: IBM Spectrum Protect Server 8.1.0.000 through 8.1.10.000 could disclose sensitive information in nondefault settings due to occasionally not encrypting the second chunk of an […]
IBM AIX 7.2 — CVE-2023-45169 — denial of service — patch and remediation guide
🟡 Medium ⏱ 15–45 min Last verified: 17 May 2023 Affected versions: IBM AIX 7.2 Affected: 7.2, 7.3 đź“– ~4 min read • Source: NVD CVE-2023-45169, IBM Support Bulletin CVE: CVE-2023-45169 NVD summary: IBM AIX 7.2, 7.3, and VIOS 3.1 could allow a non-privileged local user to exploit a vulnerability in the pmsvcs kernel […]
How to Configure Kubernetes Ingress on SLES 15
Introduction This tutorial covers How to Configure Kubernetes Ingress on SLES 15 on SLES 15. SLES 15 (SUSE Linux Enterprise Server 16) is SUSE’s enterprise-grade Linux distribution. It uses the zypper package manager, AppArmor for mandatory access control, and systemctl for service management. Step 1 — Disable Swap swapoff -a sed -i ‘/ swap / […]
Amazon Linux 2023 — pkgconf — vulnerability — patch and remediation guide
🟡 Medium ⏱ 10–30 min Last verified: 25 May 2026 Affected versions: Amazon Linux 2023 đź“– ~4 min read • Source: Amazon Linux advisory ALAS2023-2023-159 Related CVEs: CVE-2023-24056 Upstream summary: In pkgconf through 1.9.3, variable duplication can cause unbounded string expansion due to incorrect checks in libpkgconf/tuple.c:pkgconf_tuple_parse. For example, a .pc file containing a […]