Introduction Debian 11 Bullseye is built around the ethos of stability and free software. Setting up set up nginx as a reverse proxy on debian 11 on Bullseye leverages the same proven Debian packaging system that powers millions of servers worldwide, while benefiting from the latest upstream releases included in the Bullseye freeze. Follow each […]
🟡 Medium ⏱ 5–30 min Last verified: 29 May 2026 Affected versions: Windows Server 2016 📖 ~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: 25 May 2026 Affected versions: FreeBSD 13 📖 ~4 min read • Source: FreeBSD VuXML VuXML topic: xlockmore — local exploit Related CVEs: CVE-2012-4524 Upstream summary: Ignatios Souvatzis of NetBSD reports: Due to an error in the dclock screensaver in xlockmore, users who explicitly use this screensaver […]
🟠 High ⏱ 15–60 min Last verified: 25 May 2026 Affected versions: FreeBSD 13 📖 ~4 min read • Source: FreeBSD VuXML VuXML topic: Perl — heap buffer overflow when transliterating non-ASCII bytes Related CVEs: CVE-2004-0452 CVE-2005-0155 CVE-2005-0156 CVE-2005-0448 CVE-2005-3912 CVE-2005-3962 CVE-2007-5116 CVE-2013-1667 +11 more Upstream summary: 9b29abf9-4ab0-4765-b253-1875cd9b441e reports: A heap buffer overflow vulnerability […]
ModSecurity is a free web application firewall (WAF) that works with Apache, Nginx and IIS. It supports a flexible rule engine to perform simple and complex operations and comes with a Core Rule Set (CRS) which has rules for many exploits. For Apache, it is loaded as an additional module which makes it easy to install and configure. In this tutorial, you will learn how to install and configure ModSecurity and create custom rules.
🟢 Low ⏱ 5–15 min Last verified: 25 May 2026 Affected versions: Debian 11 (bullseye) 📖 ~4 min read • Source: Debian Security Tracker Related CVEs: CVE-2009-1884 Upstream summary: Off-by-one error in the bzinflate function in Bzip2.xs in the Compress-Raw-Bzip2 module before 2.018 for Perl allows context-dependent attackers to cause a denial of service […]
The Linux kernel exposes hundreds of tunable parameters through the sysctl interface, allowing system administrators to optimize network throughput, memory management, and file descriptor limits without recompiling the kernel. On RHEL 9, these tunables persist across reboots when placed in drop-in configuration files under /etc/sysctl.d/. Proper kernel tuning can dramatically reduce latency and increase throughput […]
🟢 Low ⏱ 5–15 min Last verified: 25 May 2026 Affected versions: FreeBSD 12 📖 ~4 min read • Source: FreeBSD VuXML VuXML topic: py-treq — sensitive information leak vulnerability Related CVEs: CVE-2022-23607 Upstream summary: Treq's request methods (`treq.get`, `treq.post`, `HTTPClient.request`, `HTTPClient.get`, etc.) accept cookies as a dictionary. Such cookies are not bound to […]
ProxySQL is a SQL-aware proxy server that can be positioned between your application and your database to create a caching layer to optimize MySQL queries. In this tutorial, you will use ProxySQL to set up transparent caching for a MySQL server on Ubuntu 16.04. You will then test its performance using mysqlslap with and without caching to demonstrate the effect of caching and how much time it can save when executing many similar queries.
🟢 Low ⏱ 5–15 min Last verified: 25 May 2026 Affected versions: Debian 11 (bullseye) 📖 ~4 min read • Source: Debian Security Tracker Related CVEs: CVE-2012-0878 Upstream summary: Paste Script 1.7.5 and earlier does not properly set group memberships during execution with root privileges, which might allow remote attackers to bypass intended file-access […]
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