Troubleshooting

Ubuntu 16.04 — cairo — multiple vulnerabilities (5 CVEs) — patch and remediation guide — diagnosis and fix on Ubuntu 16.04

Ubuntu 16.04 — cairo — multiple vulnerabilities (5 CVEs) — patch and remediation guide

🟡 Medium   ⏱ 10–30 min  Last verified: 17 February 2021 Affected versions: Ubuntu 16.04 (xenial) 📖 ~4 min read  •  Source: Ubuntu Security Notice USN-8140-1 Related CVEs: CVE-2020-35492 CVE-2017-9814 CVE-2019-6462 CVE-2019-6461 CVE-2016-9082 Upstream summary: Alberto Garcia, Francisco Oca and Suleman Ali discovered that Cairo did not properly manage memory. An attacker could possibly use […]

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How to Enable AppArmor on Debian 9 — step-by-step Debian 9 tutorial on Progressive Robot

How to Enable AppArmor on Debian 9

Introduction Deploying enable apparmor on debian 9 on a Debian 9 Stretch machine is straightforward thanks to Debian’s policy-compliant packaging. Unlike rpm-based distributions, Debian stores configuration helpers in /etc/default/, uses update-rc.d for older init scripts, and provides dpkg-reconfigure for interactive package configuration. This tutorial stays on the systemd path throughout. Prerequisites Before you begin, ensure […]

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openSUSE Tumbleweed — liblasso3 — vulnerability — patch and remediation guide — diagnosis and fix on openSUSE Tumbleweed

openSUSE Tumbleweed — liblasso3 — vulnerability — patch and remediation guide

🟠 High   ⏱ 15–60 min  Last verified: 25 May 2026 Affected versions: openSUSE Tumbleweed 📖 ~4 min read  •  Source: SUSE advisory openSUSE-SU-2021:1057-1 (see also SUSE bugzilla) Related CVEs: CVE-2021-28091 Upstream summary: Lasso all versions prior to 2.7.0 has improper verification of a cryptographic signature. Table of contents Symptom & Impact Environment & Reproduction […]

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SLES 12 — mysql-connector-java — multiple vulnerabilities (8 CVEs) — patch and remediation guide — diagnosis and fix on SLES 12

SLES 12 — mysql-connector-java — multiple vulnerabilities (8 CVEs) — patch and remediation guide

🟠 High   ⏱ 15–60 min  Last verified: 17 February 2021 Affected versions: SLES 12 📖 ~4 min read  •  Source: SUSE advisory SUSE-SU-2017:2591-1 (see also SUSE bugzilla) Related CVEs: CVE-2017-3523 CVE-2021-2471 CVE-2020-2875 CVE-2020-2933 CVE-2020-2934 CVE-2015-2575 CVE-2017-3586 CVE-2017-3589 Upstream summary: Vulnerability in the MySQL Connectors component of Oracle MySQL (subcomponent: Connector/J). Supported versions that are […]

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How to Deploy an Application to Kubernetes on RHEL 7 — step-by-step RHEL 7 tutorial on Progressive Robot

How to Deploy an Application to Kubernetes on RHEL 7

How to Deploy an Application to Kubernetes on RHEL 7 Deploying applications to Kubernetes involves more than simply running a container — it means defining how many replicas should run, how the application is exposed to network traffic, how it recovers from failure, and how updates are rolled out without downtime. Kubernetes provides two core […]

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Oracle Linux 8 — virt:ol and virt-devel:ol — security and stability fixes — required update — diagnosis and fix on Oracle Linux 8

Oracle Linux 8 — virt:ol and virt-devel:ol — security and stability fixes — required update (ELSA-2023-3822)

🟡 Medium   ⏱ 10–30 min  Last verified: 16 February 2021 Affected versions: Oracle Linux 8 📖 ~4 min read  •  Source: ELSA advisory ELSA-2023-3822 Related CVEs: CVE-2023-2700 Table of contents Symptom & Impact Environment & Reproduction Root Cause Analysis Quick Triage Step-by-Step Diagnosis Solution – Primary Fix Solution – Alternative Approaches Verification & Acceptance […]

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Common Problems 115056

RHEL 8 Postfix Mail Queue Stuck Due To DNS And Firewall Constraints

🟡 Medium   ⏱ 5–30 min  Last verified: 16 February 2021 📖 ~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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IBM AIX 7.1 — CVE-2021-38877 — xss — patch and remediation guide — diagnosis and fix on IBM AIX 7.1

IBM AIX 7.1 — CVE-2021-38877 — xss — patch and remediation guide

🟡 Medium   ⏱ 15–45 min  Last verified: 16 February 2021 Affected versions: IBM AIX 7.1 📖 ~4 min read  •  Source: NVD CVE-2021-38877, IBM Support Bulletin CVE: CVE-2021-38877 NVD summary: IBM Jazz for Service Management 1.1.3.10 is vulnerable to stored cross-site scripting. This vulnerability allows users to embed arbitrary JavaScript code in the Web […]

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Common Problems 114928

RHEL 8 Firewalld Blocks Application Port After Policy Change

🟡 Medium   ⏱ 5–30 min  Last verified: 16 February 2021 📖 ~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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FreeBSD 12 — nomad — vulnerability — patch and remediation guide — diagnosis and fix on FreeBSD 12

FreeBSD 12 — nomad — vulnerability — patch and remediation guide

🟢 Low   ⏱ 5–15 min  Last verified: 16 February 2021 Affected versions: FreeBSD 12 📖 ~4 min read  •  Source: FreeBSD VuXML VuXML topic: nomad — multiple vulnerabilities Related CVEs: CVE-2020-27195 Upstream summary: The HashiCorp team reports: artifact: Fixed a bug where interpolation can be used in the artifact destination field to write artifact […]

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