October 2021 - Page 22 of 69

FreeBSD 13 — citadel — security advisory — patch and remediation guide — diagnosis and fix on FreeBSD 13

FreeBSD 13 — citadel — security advisory — patch and remediation guide

🟢 Low   ⏱ 5–15 min  Last verified: 25 May 2026 Affected versions: FreeBSD 13 📖 ~4 min read  •  Source: FreeBSD VuXML VuXML topic: fd_set — bitmap index overflow in multiple applications Upstream summary: 3APA3A reports: If programmer fails to check socket number before using select() or fd_set macros, it's possible to overwrite memory […]

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How to Configure Unattended Upgrades on Ubuntu 26.04 — step-by-step Linux tutorial on Progressive Robot

How to Add and Delete Users on Ubuntu 26.04

Managing user accounts is a fundamental Linux administration task. Ubuntu 26.04 LTS provides the adduser, usermod, and deluser commands to create, modify, and remove accounts safely. Tested and valid on: Ubuntu 26.04 LTS Prerequisites Ubuntu 26.04 LTS server or desktop A user with sudo privileges Basic familiarity with the Linux terminal Step 1 – Add […]

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Debian 11 — stunnel4 — multiple vulnerabilities (7 CVEs) — patch and remediation guide — diagnosis and fix on Debian 11

Debian 11 — stunnel4 — multiple vulnerabilities (7 CVEs) — patch and remediation guide

🟡 Medium   ⏱ 10–30 min  Last verified: 25 May 2026 Affected versions: Debian 11 (bullseye) 📖 ~4 min read  •  Source: Debian Security Tracker Related CVEs: CVE-2002-1563 CVE-2003-0740 CVE-2008-2420 CVE-2011-2940 CVE-2013-1762 CVE-2015-3644 CVE-2021-20230 Upstream summary: stunnel 4.0.3 and earlier allows attackers to cause a denial of service (crash) via SIGCHLD signal handler race conditions […]

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Debian 11 — gupnp — multiple vulnerabilities (3 CVEs) — patch and remediation guide — diagnosis and fix on Debian 11

Debian 11 — gupnp — multiple vulnerabilities (3 CVEs) — patch and remediation guide

🟡 Medium   ⏱ 10–30 min  Last verified: 25 May 2026 Affected versions: Debian 11 (bullseye) 📖 ~4 min read  •  Source: Debian Security Tracker Related CVEs: CVE-2009-2174 CVE-2020-12695 CVE-2021-33516 Upstream summary: GUPnP 0.12.7 allows remote attackers to cause a denial of service (crash) via an empty (1) subscription or (2) control message. Table of […]

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Debian 11 — fetchmail — multiple vulnerabilities (20 CVEs) — patch and remediation guide — diagnosis and fix on Debian 11

Debian 11 — fetchmail — multiple vulnerabilities (20 CVEs) — patch and remediation guide

🟠 High   ⏱ 15–60 min  Last verified: 25 May 2026 Affected versions: Debian 11 (bullseye) 📖 ~4 min read  •  Source: Debian Security Tracker Related CVEs: CVE-2002-1174 CVE-2002-1175 CVE-2002-1365 CVE-2003-0792 CVE-2005-2335 CVE-2005-3088 CVE-2005-4348 CVE-2006-0321  +12 more Upstream summary: Buffer overflows in Fetchmail 6.0.0 and earlier allow remote attackers to cause a denial of service […]

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Ubuntu 16.04 — fis-gtm — multiple vulnerabilities (8 CVEs) — patch and remediation guide — diagnosis and fix on Ubuntu 16.04

Ubuntu 16.04 — fis-gtm — multiple vulnerabilities (8 CVEs) — patch and remediation guide

🟡 Medium   ⏱ 10–30 min  Last verified: 25 May 2026 Affected versions: Ubuntu 16.04 (xenial) 📖 ~4 min read  •  Source: Ubuntu Security Notice USN-7422-1 Related CVEs: CVE-2021-44492 CVE-2021-44498 CVE-2021-44500 CVE-2021-44502 CVE-2021-44506 CVE-2021-44508 CVE-2021-44509 CVE-2021-44510 Upstream summary: It was discovered that FIS-GT.M could incorrectly dereference memory in certain instances. An attacker could possibly use […]

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How To Use Views in SQL — step-by-step DevOps tutorial on Progressive Robot

How To Use Views in SQL

In Structured Query Language (SQL), a “view” is a virtual table whose contents are the result of a specific query to one or more tables. This guide provides an overview of what SQL views are and why they can be useful. It also highlights how you can create, query, modify, and destroy views using standard SQL syntax.

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