Linux

How to Configure sudo and Sudoers on RHEL 9 — step-by-step RHEL 9 tutorial on Progressive Robot

How to Configure sudo and Sudoers on RHEL 9

The sudo (superuser do) tool allows designated users to run commands with elevated privileges without sharing the root password. This is fundamental to the principle of least privilege: each administrator gets exactly the access they need for their role, no more. When access is misconfigured — for example with blanket ALL=(ALL) ALL entries or unsafe […]

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Debian 12 — pen — vulnerability — patch and remediation guide — diagnosis and fix on Debian 12

Debian 12 — pen — vulnerability — patch and remediation guide

🟢 Low   ⏱ 5–15 min  Last verified: 8 October 2024 Affected versions: Debian 12 (bookworm) 📖 ~4 min read  •  Source: Debian Security Tracker Related CVEs: CVE-2014-2387 Upstream summary: Pen 0.18.0 has Insecure Temporary File Creation vulnerabilities Table of contents Symptom & Impact Environment & Reproduction Root Cause Analysis Quick Triage Step-by-Step Diagnosis Solution […]

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Debian 12 — needrestart — multiple vulnerabilities (5 CVEs) — patch and remediation guide — diagnosis and fix on Debian 12

Debian 12 — needrestart — multiple vulnerabilities (5 CVEs) — patch and remediation guide

🟡 Medium   ⏱ 10–30 min  Last verified: 8 October 2024 Affected versions: Debian 12 (bookworm) 📖 ~4 min read  •  Source: Debian Security Tracker Related CVEs: CVE-2022-30688 CVE-2024-11003 CVE-2024-48990 CVE-2024-48991 CVE-2024-48992 Upstream summary: needrestart 0.8 through 3.5 before 3.6 is prone to local privilege escalation. Regexes to detect the Perl, Python, and Ruby interpreters […]

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Alpine Linux 3.20 — upx — multiple vulnerabilities (17 CVEs) — patch and remediation guide — diagnosis and fix on Alpine Linux 3.20

Alpine Linux 3.20 — upx — multiple vulnerabilities (17 CVEs) — patch and remediation guide

🟠 High   ⏱ 15–60 min  Last verified: 25 May 2026 Affected versions: Alpine Linux 3.20 / fixed in 4.0.2-r0 📖 ~4 min read  •  Source: Alpine secdb entry — upx 4.0.2-r0 Related CVEs: CVE-2023-23456 CVE-2023-23457 CVE-2020-24119 CVE-2020-27796 CVE-2020-27797 CVE-2020-27798 CVE-2020-27799 CVE-2020-27800  +9 more Upstream summary: Alpine community repository for vv3.20 ships upx 4.0.2-r0 which […]

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Common Problems 116443

Ubuntu 24.04 LTS – snapd service fails and snap applications do not launch

🟠 High   ⏱ 5–30 min  Last verified: 8 October 2024 Affected versions: Ubuntu 24.04 LTS Ubuntu 24.04 Ubuntu 24.04.1 📖 ~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 […]

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Debian 12 — openvpn — multiple vulnerabilities (20 CVEs) — patch and remediation guide — diagnosis and fix on Debian 12

Debian 12 — openvpn — multiple vulnerabilities (20 CVEs) — patch and remediation guide

🟠 High   ⏱ 15–60 min  Last verified: 8 October 2024 Affected versions: Debian 12 (bookworm) 📖 ~4 min read  •  Source: Debian Security Tracker Related CVEs: CVE-2005-2531 CVE-2005-2532 CVE-2005-2533 CVE-2005-2534 CVE-2005-3393 CVE-2005-3409 CVE-2006-1629 CVE-2008-3459  +12 more Upstream summary: OpenVPN before 2.0.1, when running with "verb 0" and without TLS authentication, does not properly flush […]

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Debian 12 — atftp — multiple vulnerabilities (6 CVEs) — patch and remediation guide — diagnosis and fix on Debian 12

Debian 12 — atftp — multiple vulnerabilities (6 CVEs) — patch and remediation guide

🟡 Medium   ⏱ 10–30 min  Last verified: 8 October 2024 Affected versions: Debian 12 (bookworm) 📖 ~4 min read  •  Source: Debian Security Tracker Related CVEs: CVE-2003-0380 CVE-2019-11365 CVE-2019-11366 CVE-2020-6097 CVE-2021-41054 CVE-2021-46671 Upstream summary: Buffer overflow in atftp daemon (atftpd) 0.6.1 and earlier, and possibly later versions, allows remote attackers to cause a denial […]

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Alpine Linux 3.19 — upx — multiple vulnerabilities (17 CVEs) — patch and remediation guide — diagnosis and fix on Alpine Linux 3.19

Alpine Linux 3.19 — upx — multiple vulnerabilities (17 CVEs) — patch and remediation guide

🟠 High   ⏱ 15–60 min  Last verified: 25 May 2026 Affected versions: Alpine Linux 3.19 / fixed in 4.0.2-r0 📖 ~4 min read  •  Source: Alpine secdb entry — upx 4.0.2-r0 Related CVEs: CVE-2023-23456 CVE-2023-23457 CVE-2020-24119 CVE-2020-27796 CVE-2020-27797 CVE-2020-27798 CVE-2020-27799 CVE-2020-27800  +9 more Upstream summary: Alpine community repository for vv3.19 ships upx 4.0.2-r0 which […]

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Debian 12 — httpie — multiple vulnerabilities (4 CVEs) — patch and remediation guide — diagnosis and fix on Debian 12

Debian 12 — httpie — multiple vulnerabilities (4 CVEs) — patch and remediation guide

🟡 Medium   ⏱ 10–30 min  Last verified: 8 October 2024 Affected versions: Debian 12 (bookworm) 📖 ~4 min read  •  Source: Debian Security Tracker Related CVEs: CVE-2019-10751 CVE-2022-0430 CVE-2022-24737 CVE-2023-48052 Upstream summary: All versions of the HTTPie package prior to version 1.0.3 are vulnerable to Open Redirect that allows an attacker to write an […]

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Ubuntu 20.04 — golang-1.22 — multiple vulnerabilities (4 CVEs) — patch and remediation guide — diagnosis and fix on Ubuntu 20.04

Ubuntu 20.04 — golang-1.22 — multiple vulnerabilities (4 CVEs) — patch and remediation guide

🟡 Medium   ⏱ 10–30 min  Last verified: 8 October 2024 Affected versions: Ubuntu 20.04 (focal) 📖 ~4 min read  •  Source: Ubuntu Security Notice USN-7081-1 Related CVEs: CVE-2024-24791 CVE-2024-34155 CVE-2024-34156 CVE-2024-34158 Upstream summary: It was discovered that the Go net/http module did not properly handle responses to requests with an "Expect: 100-continue" header under […]

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