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Debian 11 — duo-unix — vulnerability — patch and remediation guide — diagnosis and fix on Debian 11

Debian 11 — duo-unix — vulnerability — patch and remediation guide

🟢 Low   ⏱ 5–15 min  Last verified: 14 August 2022 Affected versions: Debian 11 (bullseye) 📖 ~4 min read  •  Source: Debian Security Tracker Related CVEs: CVE-2020-12135 Upstream summary: bson before 0.8 incorrectly uses int rather than size_t for many variables, parameters, and return values. In particular, the bson_ensure_space() parameter bytesNeeded could have an […]

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Debian 11 — nmap — multiple vulnerabilities (4 CVEs) — patch and remediation guide — diagnosis and fix on Debian 11

Debian 11 — nmap — multiple vulnerabilities (4 CVEs) — patch and remediation guide

🟡 Medium   ⏱ 10–30 min  Last verified: 14 August 2022 Affected versions: Debian 11 (bullseye) 📖 ~4 min read  •  Source: Debian Security Tracker Related CVEs: CVE-2013-4885 CVE-2017-18594 CVE-2018-1000161 CVE-2018-15173 Upstream summary: The http-domino-enum-passwords.nse script in NMap before 6.40, when domino-enum-passwords.idpath is set, allows remote servers to upload "arbitrarily named" files via a crafted […]

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Common Problems 120699

Debian 11 – Fail2ban blocks internal monitoring and trusted hosts

🟡 Medium   ⏱ 5–30 min  Last verified: 14 August 2022 Affected versions: Debian 11 📖 ~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 & […]

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Debian 11 — db5.3 — multiple vulnerabilities (2 CVEs) — patch and remediation guide — diagnosis and fix on Debian 11

Debian 11 — db5.3 — multiple vulnerabilities (2 CVEs) — patch and remediation guide

🟢 Low   ⏱ 5–15 min  Last verified: 14 August 2022 Affected versions: Debian 11 (bullseye) 📖 ~4 min read  •  Source: Debian Security Tracker Related CVEs: CVE-2017-10140 CVE-2019-8457 Upstream summary: Postfix before 2.11.10, 3.0.x before 3.0.10, 3.1.x before 3.1.6, and 3.2.x before 3.2.2 might allow local users to gain privileges by leveraging undocumented functionality […]

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

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

🟠 High   ⏱ 15–60 min  Last verified: 14 August 2022 Affected versions: Debian 11 (bullseye) 📖 ~4 min read  •  Source: Debian Security Tracker Related CVEs: CVE-2009-1959 CVE-2010-1155 CVE-2010-1156 CVE-2016-7044 CVE-2016-7045 CVE-2016-7553 CVE-2017-10965 CVE-2017-10966  +12 more Upstream summary: Off-by-one error in the event_wallops function in fe-common/irc/fe-events.c in irssi 0.8.13 allows remote IRC servers to […]

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How to Configure Ceph Storage Cluster on Debian 11 — step-by-step Debian 11 tutorial on Progressive Robot

How to Configure Ceph Storage Cluster on Debian 11

Introduction How to Configure Ceph Storage Cluster on Debian 11 is a fundamental operation for any administrator maintaining a Debian 11 Bullseye server. Debian 11 Bullseye ships with the Linux 6.12 kernel, updated toolchains, and a fully refreshed package archive — meaning version numbers, configuration file paths, and some dependency chains differ from Debian 11. […]

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AlmaLinux 8 — gnome-color-manager — multiple vulnerabilities (20 CVEs) — patch and remediation guide — diagnosis and fix on AlmaLinux 8

AlmaLinux 8 — gnome-color-manager — multiple vulnerabilities (20 CVEs) — patch and remediation guide

🟡 Medium   ⏱ 10–30 min  Last verified: 25 May 2026 Affected versions: AlmaLinux 8 📖 ~4 min read  •  Source: AlmaLinux ALSA ALSA-2020:1577 Related CVEs: CVE-2017-18005 CVE-2018-10772 CVE-2018-11037 CVE-2018-14338 CVE-2018-17229 CVE-2018-17230 CVE-2018-17282 CVE-2018-17581  +12 more Upstream summary: The exiv2 packages provide a command line utility which can display and manipulate image metadata such as […]

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Debian 11 — ruby-asciidoctor-include-ext — vulnerability — patch and remediation guide — diagnosis and fix on Debian 11

Debian 11 — ruby-asciidoctor-include-ext — vulnerability — patch and remediation guide

🟢 Low   ⏱ 5–15 min  Last verified: 14 August 2022 Affected versions: Debian 11 (bullseye) 📖 ~4 min read  •  Source: Debian Security Tracker Related CVEs: CVE-2022-24803 Upstream summary: Asciidoctor-include-ext is Asciidoctor’s standard include processor reimplemented as an extension. Versions prior to 0.4.0, when used to render user-supplied input in AsciiDoc markup, may allow […]

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Common Problems 117095

Ubuntu 22.04 LTS – Certbot renewal fails due to broken challenge path – Fix & Prevention

🟠 High   ⏱ 5–30 min  Last verified: 14 August 2022 Affected versions: Ubuntu 22.04 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 […]

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