Security Hardening

How to Configure Apache with mod_security on SLES 15 — step-by-step SUSE Linux Enterprise 15 tutorial on Progressive Robot

How to Configure Apache with mod_security on SLES 15

Introduction This tutorial covers How to Configure Apache with mod_security on SLES 15 on SLES 15. SLES 15 (SUSE Linux Enterprise Server 16) is SUSE’s enterprise-grade Linux distribution. It uses the zypper package manager, AppArmor for mandatory access control, and systemctl for service management. Prerequisites Ensure your SLES 15 system is up to date: zypper […]

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FreeBSD 12 — rubygem20-dragonfly — vulnerability — patch and remediation guide — diagnosis and fix on FreeBSD 12

FreeBSD 12 — rubygem20-dragonfly — vulnerability — patch and remediation guide

🟢 Low   ⏱ 5–15 min  Last verified: 6 July 2019 Affected versions: FreeBSD 12 📖 ~4 min read  •  Source: FreeBSD VuXML VuXML topic: rubygem-dragonfly — arbitrary code execution Related CVEs: CVE-2013-1756 Upstream summary: Mark Evans reports: Unfortnately there is a security vulnerability in Dragonfly when used with Rails which would potentially allow an […]

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Amazon Linux 2 — doxygen — vulnerability — patch and remediation guide — diagnosis and fix on Amazon Linux 2

Amazon Linux 2 — doxygen — vulnerability — 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 ALAS2-2020-1508 Related CVEs: CVE-2016-10245 Upstream summary: Insufficient sanitization of the query parameter in templates/html/search_opensearch.php could lead to reflected cross-site scripting or iframe injection. (CVE-2016-10245) Table of contents Symptom & Impact […]

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FreeBSD 12 — py38-kerberos — vulnerability — patch and remediation guide — diagnosis and fix on FreeBSD 12

FreeBSD 12 — py38-kerberos — vulnerability — patch and remediation guide

🟢 Low   ⏱ 5–15 min  Last verified: 6 July 2019 Affected versions: FreeBSD 12 📖 ~4 min read  •  Source: FreeBSD VuXML VuXML topic: py-kerberos — DoS and MitM vulnerabilities Related CVEs: CVE-2015-3206 Upstream summary: macosforgebot reports: The checkPassword function in python-kerberos does not authenticate the KDC it attempts to communicate with, which allows […]

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

openSUSE Tumbleweed — cecilia — vulnerability — patch and remediation guide

🟡 Medium   ⏱ 10–30 min  Last verified: 25 May 2026 Affected versions: openSUSE Tumbleweed 📖 ~4 min read  •  Source: SUSE security advisory (see also SUSE bugzilla) Related CVEs: CVE-2008-1832 Upstream summary: lib/prefs.tcl in Cecilia 2.0.5 allows local users to overwrite arbitrary files via a symlink attack on the csvers temporary file. Table of […]

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FreeBSD 12 — php5-xsl — multiple vulnerabilities (5 CVEs) — patch and remediation guide — diagnosis and fix on FreeBSD 12

FreeBSD 12 — php5-xsl — multiple vulnerabilities (5 CVEs) — patch and remediation guide

🟡 Medium   ⏱ 10–30 min  Last verified: 6 July 2019 Affected versions: FreeBSD 12 📖 ~4 min read  •  Source: FreeBSD VuXML VuXML topic: php — multiple vulnerabilities Related CVEs: CVE-2015-6834 CVE-2015-6835 CVE-2015-6836 CVE-2015-6837 CVE-2015-6838 Upstream summary: PHP reports: Core: Fixed bug #70172 (Use After Free Vulnerability in unserialize()). Fixed bug #70219 (Use after […]

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openSUSE Tumbleweed — libpcre1 — multiple vulnerabilities (7 CVEs) — patch and remediation guide — diagnosis and fix on openSUSE Tumbleweed

openSUSE Tumbleweed — libpcre1 — multiple vulnerabilities (7 CVEs) — patch and remediation guide

🔴 Critical   ⏱ 15–90 min  Last verified: 25 May 2026 Affected versions: openSUSE Tumbleweed 📖 ~4 min read  •  Source: SUSE advisory SUSE-CU-2019:695-1 (see also SUSE bugzilla) Related CVEs: CVE-2016-1283 CVE-2017-6004 CVE-2014-8964 CVE-2015-3217 CVE-2017-7186 CVE-2017-7245 CVE-2016-3191 Upstream summary: The pcre_compile2 function in pcre_compile.c in PCRE 8.38 mishandles the /((?:F?+(?:^(?(R)a+"){99}-))(?J)(?'R'(?'R'<((?'RR'(?'R'){97)?J)?J)(?'R'(?'R'){99|(:(?|(?'R')(k'R')|((?'R')))H'R'R)(H'R))))))/ pattern and related patterns with […]

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Common Problems 119121

Ubuntu 14.04 LTS GRUB update fails and leaves system unbootable

🔴 Critical   ⏱ 5–30 min  Last verified: 5 July 2019 Affected versions: 14.04 📖 ~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 […]

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FreeBSD 12 — ja-iv — multiple vulnerabilities (5 CVEs) — patch and remediation guide — diagnosis and fix on FreeBSD 12

FreeBSD 12 — ja-iv — multiple vulnerabilities (5 CVEs) — patch and remediation guide

🟡 Medium   ⏱ 10–30 min  Last verified: 5 July 2019 Affected versions: FreeBSD 12 📖 ~4 min read  •  Source: FreeBSD VuXML VuXML topic: tiff — buffer overflow vulnerability Related CVEs: CVE-2004-0803 CVE-2004-0804 CVE-2004-0886 CVE-2004-1308 CVE-2005-1544 Upstream summary: A Gentoo Linux Security Advisory reports: Tavis Ormandy of the Gentoo Linux Security Audit Team discovered […]

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Common Problems 118121

Ubuntu 18.04 Cannot Resolve Hostname in sudo

🟡 Medium   ⏱ 5–30 min  Last verified: 5 July 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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