ubuntu

Common Problems 119013

Ubuntu 14.04 LTS system clock drift and NTP sync failure

🟡 Medium   ⏱ 5–30 min  Last verified: 11 May 2020 📖 ~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 & Cross-Refs References & Further […]

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Ubuntu 20.04 — pacemaker — vulnerability — patch and remediation guide — diagnosis and fix on Ubuntu 20.04

Ubuntu 20.04 — pacemaker — vulnerability — patch and remediation guide

🟢 Low   ⏱ 5–15 min  Last verified: 11 May 2020 Affected versions: Ubuntu 20.04 (focal) 📖 ~4 min read  •  Source: Ubuntu Security Notice USN-4623-1 Related CVEs: CVE-2020-25654 Upstream summary: Ken Gaillot discovered that Pacemaker incorrectly handled IPC communications permissions. A local attacker could possibly use this issue to bypass ACL restrictions and execute […]

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How To Set Filesystem Quotas on Ubuntu 20.04 — step-by-step Linux tutorial on Progressive Robot

How To Set Filesystem Quotas on Ubuntu 20.04

Quotas are used to limit the amount of disk space a user or group can use on a filesystem. Without such limits, a user could fill up the machine’s disk and cause problems for other users and services. In this tutorial we will install command line tools to create and inspect disk quotas on Ubuntu 20.04, then set a quota for an example user.

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Common Problems 117502

Ubuntu 20.04 LTS NTP Drift Causes TLS and Token Failures

🟠 High   ⏱ 5–30 min  Last verified: 9 May 2020 Affected versions: 20.04 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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Ubuntu 18.04 — python-mistral-lib — multiple vulnerabilities (3 CVEs) — patch and remediation guide — diagnosis and fix on Ubuntu 18.04

Ubuntu 18.04 — python-mistral-lib — multiple vulnerabilities (3 CVEs) — patch and remediation guide

🟡 Medium   ⏱ 10–30 min  Last verified: 9 May 2020 Affected versions: Ubuntu 18.04 (bionic) 📖 ~4 min read  •  Source: Ubuntu Security Notice USN-7465-1 Related CVEs: CVE-2018-16848 CVE-2018-16849 CVE-2019-3866 Upstream summary: It was discovered that Mistral incorrectly handled nested anchors in YAML files. An attacker could possibly use this issue to cause a […]

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Common Problems 118126

Ubuntu 18.04 LTS – rsyslog forwarding stops after remote TLS policy update – Fix & Prevention

🟠 High   ⏱ 5–30 min  Last verified: 8 May 2020 Affected versions: Ubuntu 18.04 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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Common Problems 117628

Ubuntu 20.04 LTS – certbot renewal fails because port 80 is in use

🟠 High   ⏱ 5–30 min  Last verified: 8 May 2020 Affected versions: Ubuntu 20.04 LTS Ubuntu 20.04 Ubuntu 20.04.6 📖 ~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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