Linux

Amazon Linux 2 — keycloak-httpd-client-install — multiple vulnerabilities (2 CVEs) — patch and remediation guide — diagnosis and fix on Amazon Linux 2

Amazon Linux 2 — keycloak-httpd-client-install — multiple vulnerabilities (2 CVEs) — patch and remediation guide

🟢 Low   ⏱ 5–15 min  Last verified: 25 May 2026 Affected versions: Amazon Linux 2 📖 ~4 min read  •  Source: Amazon Linux advisory ALAS2-2019-1324 Related CVEs: CVE-2017-15111 CVE-2017-15112 Upstream summary: It was discovered that keycloak-httpd-client-install uses a predictable log file name in /tmp. A local attacker could create a symbolic link to a […]

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How to Set Up Chef Infra Client on Debian 9 — step-by-step Debian 9 tutorial on Progressive Robot

How to Set Up Chef Infra Client on Debian 9

Introduction Deploying set up chef infra client 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 Ensure […]

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How to Configure auditd for Security Event Logging on RHEL 7 — step-by-step RHEL 7 tutorial on Progressive Robot

How to Configure auditd for Security Event Logging on RHEL 7

The Linux Audit Framework, managed by the auditd daemon, provides a comprehensive kernel-level mechanism for tracking security-relevant events on RHEL 7. Unlike application-level logging, the audit subsystem operates below the application layer, meaning that even a compromised process cannot suppress its own audit trail without also compromising the kernel. Properly configured, auditd records file access, […]

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Ubuntu 18.04 — openssl-ibmca — vulnerability — patch and remediation guide — diagnosis and fix on Ubuntu 18.04

Ubuntu 18.04 — openssl-ibmca — vulnerability — patch and remediation guide

🟢 Low   ⏱ 5–15 min  Last verified: 20 September 2019 Affected versions: Ubuntu 18.04 (bionic) 📖 ~4 min read  •  Source: Ubuntu Security Notice USN-6046-1 Related CVEs: https://launchpad.net/bugs/2015454 Upstream summary: It was discovered that OpenSSL-ibmca incorrectly handled certain RSA decryption. An attacker could possibly use this issue to expose sensitive information. Table of contents […]

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SLES 15 — libgypsy0 — multiple vulnerabilities (2 CVEs) — patch and remediation guide — diagnosis and fix on SLES 15

SLES 15 — libgypsy0 — multiple vulnerabilities (2 CVEs) — patch and remediation guide

🟡 Medium   ⏱ 10–30 min  Last verified: 20 September 2019 Affected versions: SLES 15 📖 ~4 min read  •  Source: SUSE security advisory (see also SUSE bugzilla) Related CVEs: CVE-2011-0523 CVE-2011-0524 Upstream summary: gypsy 0.8 does not properly restrict the files that can be read while running with root privileges, which allows local users […]

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

openSUSE Tumbleweed — unshield — vulnerability — patch and remediation guide

🟢 Low   ⏱ 5–15 min  Last verified: 25 May 2026 Affected versions: openSUSE Tumbleweed 📖 ~4 min read  •  Source: SUSE security advisory (see also SUSE bugzilla) Related CVEs: CVE-2015-1386 Upstream summary: Directory traversal vulnerability in unshield 1.0-1. Table of contents Symptom & Impact Environment & Reproduction Root Cause Analysis Quick Triage Step-by-Step Diagnosis […]

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Common Problems 117997

Ubuntu 18.04 ext4 Filesystem Mounts Read-Only After I/O Errors

🟡 Medium   ⏱ 5–30 min  Last verified: 19 September 2019 📖 ~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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Common Problems 117933

Ubuntu 18.04 LTS system runs out of disk space in /var

🟡 Medium   ⏱ 5–30 min  Last verified: 19 September 2019 📖 ~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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