Common Problems

Ubuntu 14.04 — grub2 — multiple vulnerabilities (11 CVEs) — patch and remediation guide — diagnosis and fix on Ubuntu 14.04

Ubuntu 14.04 — grub2 — multiple vulnerabilities (11 CVEs) — patch and remediation guide

  • July 26, 2020
  • Linux
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🟠 High   ⏱ 15–60 min  Last verified: 26 July 2020 Affected versions: Ubuntu 14.04 (trusty) 📖 ~4 min read  •  Source: Ubuntu Security Notice USN-4432-2 Related CVEs: https://launchpad.net/bugs/1889556 https://wiki.ubuntu.com/SecurityTeam/KnowledgeBase/GRUB2SecureBootBypass CVE-2020-10713 CVE-2020-14308 CVE-2020-14309 CVE-2020-14310 CVE-2020-14311 CVE-2020-15705  +3 more Upstream summary: USN-4432-1 fixed vulnerabilities in GRUB2 affecting Secure Boot environments. Unfortunately, the update introduced regressions for […]

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Ubuntu 16.04 — moin — multiple vulnerabilities (6 CVEs) — patch and remediation guide — diagnosis and fix on Ubuntu 16.04

Ubuntu 16.04 — moin — multiple vulnerabilities (6 CVEs) — patch and remediation guide

  • July 26, 2020
  • Linux
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🟡 Medium   ⏱ 10–30 min  Last verified: 26 July 2020 Affected versions: Ubuntu 16.04 (xenial) 📖 ~4 min read  •  Source: Ubuntu Security Notice USN-4629-1 Related CVEs: CVE-2020-15275 CVE-2020-25074 CVE-2017-5934 CVE-2016-7146 CVE-2016-7148 CVE-2016-9119 Upstream summary: Michael Chapman discovered that MoinMoin incorrectly handled certain cache actions. An attacker could possibly use this issue to execute […]

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Ubuntu 16.04 — ruby-websocket-extensions — vulnerability — patch and remediation guide — diagnosis and fix on Ubuntu 16.04

Ubuntu 16.04 — ruby-websocket-extensions — vulnerability — patch and remediation guide

  • July 25, 2020
  • Linux
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🟢 Low   ⏱ 5–15 min  Last verified: 25 July 2020 Affected versions: Ubuntu 16.04 (xenial) 📖 ~4 min read  •  Source: Ubuntu Security Notice USN-4502-1 Related CVEs: CVE-2020-7663 Upstream summary: It was discovered that websocket-extensions does not properly parse special headers. A remote attacker could use this issue to cause regex backtracking, resulting in […]

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Common Problems 112513

Windows Server 2019 — Static routes lost after reboot due to persistent store misconfiguration in Server 2019 — Fix & Prevention

🟡 Medium   ⏱ 5–30 min  Last verified: 25 July 2020 Affected versions: Windows Server 2019 📖 ~2 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 20.04 — pcre3 — multiple vulnerabilities (2 CVEs) — patch and remediation guide — diagnosis and fix on Ubuntu 20.04

Ubuntu 20.04 — pcre3 — multiple vulnerabilities (2 CVEs) — patch and remediation guide

  • July 25, 2020
  • Linux
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🟢 Low   ⏱ 5–15 min  Last verified: 25 July 2020 Affected versions: Ubuntu 20.04 (focal) 📖 ~4 min read  •  Source: Ubuntu Security Notice USN-5425-1 Related CVEs: CVE-2019-20838 CVE-2020-14155 Upstream summary: Yunho Kim discovered that PCRE incorrectly handled memory when handling certain regular expressions. An attacker could possibly use this issue to cause applications […]

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SLES 15 — bubblewrap — multiple vulnerabilities (2 CVEs) — patch and remediation guide — diagnosis and fix on SLES 15

SLES 15 — bubblewrap — multiple vulnerabilities (2 CVEs) — patch and remediation guide

  • July 25, 2020
  • Linux
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🟠 High   ⏱ 15–60 min  Last verified: 25 July 2020 Affected versions: SLES 15 📖 ~4 min read  •  Source: SUSE security advisory (see also SUSE bugzilla) Related CVEs: CVE-2020-5291 CVE-2019-12439 Upstream summary: Bubblewrap (bwrap) before version 0.4.1, if installed in setuid mode and the kernel supports unprivileged user namespaces, then the `bwrap –userns2` […]

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Oracle Linux 8 — dotnet3.1 — vulnerability — patch and remediation guide — diagnosis and fix on Oracle Linux 8

Oracle Linux 8 — dotnet3.1 — vulnerability — patch and remediation guide (ELSA-2020-2250)

  • July 25, 2020
  • Linux
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🟠 High   ⏱ 15–60 min  Last verified: 25 July 2020 Affected versions: Oracle Linux 8 📖 ~4 min read  •  Source: ELSA advisory ELSA-2020-2250 Related CVEs: CVE-2020-1108 CVE-2020-1161 Table of contents Symptom & Impact Environment & Reproduction Root Cause Analysis Quick Triage Step-by-Step Diagnosis Solution – Primary Fix Solution – Alternative Approaches Verification & […]

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openSUSE Tumbleweed — teeworlds — multiple vulnerabilities (3 CVEs) — patch and remediation guide — diagnosis and fix on openSUSE Tumbleweed

openSUSE Tumbleweed — teeworlds — multiple vulnerabilities (3 CVEs) — patch and remediation guide

  • July 25, 2020
  • Linux
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🔴 Critical   ⏱ 15–90 min  Last verified: 25 May 2026 Affected versions: openSUSE Tumbleweed 📖 ~4 min read  •  Source: SUSE advisory openSUSE-SU-2020:0557-1 (see also SUSE bugzilla) Related CVEs: CVE-2019-20787 CVE-2020-12066 CVE-2014-9351 Upstream summary: Teeworlds before 0.7.4 has an integer overflow when computing a tilemap size. Table of contents Symptom & Impact Environment & […]

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Common Problems 119077

Ubuntu 14.04 LTS – high CPU from kswapd due memory pressure

  • July 24, 2020
  • Linux
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🟠 High   ⏱ 5–30 min  Last verified: 24 July 2020 Affected versions: Ubuntu 14.04 LTS Ubuntu 14.04 Ubuntu 14.04.6 📖 ~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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Common Problems 117461

Ubuntu 20.04 LTS Netplan Apply Breaks Remote Connectivity

  • July 24, 2020
  • Linux
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🟠 High   ⏱ 5–30 min  Last verified: 24 July 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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