Troubleshooting

Common Problems 112965

Windows Server 2016 CSV Redirected I/O Mode Reducing Cluster Throughput – Fix & Prevention

🟠 High   ⏱ 5–30 min  Last verified: 1 March 2020 Affected versions: Windows Server 2016 📖 ~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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FreeBSD 12 — rubygem18-rdoc — vulnerability — patch and remediation guide — diagnosis and fix on FreeBSD 12

FreeBSD 12 — rubygem18-rdoc — vulnerability — patch and remediation guide

🟢 Low   ⏱ 5–15 min  Last verified: 1 March 2020 Affected versions: FreeBSD 12 📖 ~4 min read  •  Source: FreeBSD VuXML VuXML topic: Ruby — XSS exploit of RDoc documentation generated by rdoc Related CVEs: CVE-2013-0256 Upstream summary: Ruby developers report: RDoc documentation generated by rdoc bundled with ruby are vulnerable to an […]

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FreeBSD 12 — testdisk — security advisory — patch and remediation guide — diagnosis and fix on FreeBSD 12

FreeBSD 12 — testdisk — security advisory — patch and remediation guide

🟢 Low   ⏱ 5–15 min  Last verified: 1 March 2020 Affected versions: FreeBSD 12 📖 ~4 min read  •  Source: FreeBSD VuXML VuXML topic: testdisk — buffer overflow with malicious disk image Upstream summary: CGSecurity TestDisk Changelog reports: Various fix including security fix, thanks to: Coverity scan (Static Analysis of source code) afl-fuzz (security-oriented […]

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Amazon Linux 2 — libssh2 — multiple vulnerabilities (11 CVEs) — patch and remediation guide — diagnosis and fix on Amazon Linux 2

Amazon Linux 2 — libssh2 — multiple vulnerabilities (11 CVEs) — patch and remediation guide

🟠 High   ⏱ 15–60 min  Last verified: 25 May 2026 Affected versions: Amazon Linux 2 📖 ~4 min read  •  Source: Amazon Linux advisory ALAS2-2023-2257 Related CVEs: CVE-2020-22218 CVE-2019-3855 CVE-2019-3856 CVE-2019-3857 CVE-2019-3863 CVE-2019-3859 CVE-2019-3860 CVE-2019-17498  +3 more Upstream summary: An issue was discovered in function _libssh2_packet_add in libssh2 1.10.0 allows attackers to access out […]

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How to Use Terraform to Provision Infrastructure on RHEL 7 — step-by-step RHEL 7 tutorial on Progressive Robot

How to Use Terraform to Provision Infrastructure on RHEL 7

How to Use Terraform to Provision Infrastructure on RHEL 7 Once Terraform is installed, the real power comes from writing complete, production-grade infrastructure configurations. A single Terraform project can define an entire cloud environment — VPC networking, subnets, security groups, EC2 instances, load balancers, and databases — all in version-controlled code that can be reviewed, […]

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SLES 15 — libspeex1 — vulnerability — patch and remediation guide — diagnosis and fix on SLES 15

SLES 15 — libspeex1 — vulnerability — patch and remediation guide

🟡 Medium   ⏱ 10–30 min  Last verified: 1 March 2020 Affected versions: SLES 15 📖 ~4 min read  •  Source: SUSE advisory SUSE-SU-2021:3858-1 (see also SUSE bugzilla) Related CVEs: CVE-2020-23903 Upstream summary: A Divide by Zero vulnerability in the function static int read_samples of Speex v1.2 allows attackers to cause a denial of service […]

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openSUSE Tumbleweed — file — multiple vulnerabilities (11 CVEs) — patch and remediation guide — diagnosis and fix on openSUSE Tumbleweed

openSUSE Tumbleweed — file — multiple vulnerabilities (11 CVEs) — patch and remediation guide

🔴 Critical   ⏱ 15–90 min  Last verified: 25 May 2026 Affected versions: openSUSE Tumbleweed 📖 ~4 min read  •  Source: SUSE advisory openSUSE-SU-2020:0677-1 (see also SUSE bugzilla) Related CVEs: CVE-2019-18218 CVE-2007-1536 CVE-2007-2799 CVE-2012-1571 CVE-2014-3710 CVE-2014-8116 CVE-2014-8117 CVE-2017-1000249  +3 more Upstream summary: cdf_read_property_info in cdf.c in file through 5.37 does not restrict the number of […]

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Debian 9 — xen — multiple vulnerabilities (11 CVEs) — patch and remediation guide — diagnosis and fix on Debian 9

Debian 9 — xen — multiple vulnerabilities (11 CVEs) — patch and remediation guide

🟠 High   ⏱ 15–60 min  Last verified: 1 March 2020 Affected versions: Debian 9 (stretch) 📖 ~4 min read  •  Source: Debian Security Tracker Related CVEs: CVE-2017-10912 CVE-2017-14316 CVE-2017-17563 CVE-2018-8897 CVE-2019-17349 CVE-2018-12891 CVE-2018-3620 CVE-2018-19961  +3 more Table of contents Symptom & Impact Environment & Reproduction Root Cause Analysis Quick Triage Step-by-Step Diagnosis Solution – […]

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Common Problems 118987

UFW Blocks SSH Access After Rule Changes on Ubuntu 14.04

🟡 Medium   ⏱ 5–30 min  Last verified: 29 February 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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Common Problems 118472

Ubuntu 16.04 Swap Not Activating After Reboot

🟡 Medium   ⏱ 5–30 min  Last verified: 29 February 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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