Troubleshooting

How to Configure Automatic Security Updates on RHEL 7 — step-by-step RHEL 7 tutorial on Progressive Robot

How to Configure Automatic Security Updates on RHEL 7

How to Configure Automatic Security Updates on RHEL 7 Keeping a RHEL 7 server patched against known vulnerabilities is one of the most impactful things you can do to improve its security posture. While manual patching is reliable, it requires discipline and can be delayed during busy operational periods. Automating security updates ensures that critical […]

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FreeBSD 12 — mencoder — multiple vulnerabilities (20 CVEs) — patch and remediation guide — diagnosis and fix on FreeBSD 12

FreeBSD 12 — mencoder — multiple vulnerabilities (20 CVEs) — patch and remediation guide

🟠 High   ⏱ 15–60 min  Last verified: 22 February 2020 Affected versions: FreeBSD 12 📖 ~4 min read  •  Source: FreeBSD VuXML VuXML topic: ffmpeg — remote denial of service in JPEG2000 decoder Related CVEs: CVE-2014-4610 CVE-2015-3395 CVE-2015-6761 CVE-2015-6818 CVE-2015-6819 CVE-2015-6820 CVE-2015-6821 CVE-2015-6822  +12 more Upstream summary: FFmpeg security reports: FFmpeg 2.8.6 fixes the […]

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

openSUSE Tumbleweed — fribidi — 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-2021:0763-1 (see also SUSE bugzilla) Related CVEs: CVE-2019-18397 Upstream summary: A buffer overflow in the fribidi_get_par_embedding_levels_ex() function in lib/fribidi-bidi.c of GNU FriBidi through 1.0.7 allows an attacker to cause a denial of […]

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

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

🟡 Medium   ⏱ 10–30 min  Last verified: 22 February 2020 Affected versions: Ubuntu 16.04 (xenial) 📖 ~4 min read  •  Source: Ubuntu Security Notice USN-4542-1 Related CVEs: CVE-2019-12107 CVE-2019-12108 CVE-2019-12109 CVE-2019-12110 CVE-2019-12111 Upstream summary: It was discovered that MiniUPnPd did not properly validate callback addresses. A remote attacker could possibly use this issue to […]

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Ubuntu 16.04 — vino — multiple vulnerabilities (8 CVEs) — patch and remediation guide — diagnosis and fix on Ubuntu 16.04

Ubuntu 16.04 — vino — multiple vulnerabilities (8 CVEs) — patch and remediation guide

🟡 Medium   ⏱ 10–30 min  Last verified: 22 February 2020 Affected versions: Ubuntu 16.04 (xenial) 📖 ~4 min read  •  Source: Ubuntu Security Notice USN-4636-1 Related CVEs: CVE-2020-25708 CVE-2014-6053 CVE-2018-7225 CVE-2019-15681 CVE-2020-14397 CVE-2020-14402 CVE-2020-14403 CVE-2020-14404 Upstream summary: It was discovered that LibVNCServer incorrectly handled certain internals. An attacker could possibly use this issue to […]

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How to Configure IPv6 Networking on RHEL 8 — step-by-step RHEL 8 tutorial on Progressive Robot

How to Configure IPv6 Networking on RHEL 8

IPv6 adoption has accelerated significantly as IPv4 address exhaustion becomes more acute, and most modern Linux distributions including RHEL 8 ship with full IPv6 support enabled by default. Configuring IPv6 on RHEL 8 requires working with nmcli for network interface configuration, firewalld for controlling IPv6 traffic including ICMPv6, and optionally adjusting service configurations to bind […]

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openSUSE Tumbleweed — DirectFB — multiple vulnerabilities (2 CVEs) — patch and remediation guide — diagnosis and fix on openSUSE Tumbleweed

openSUSE Tumbleweed — DirectFB — multiple vulnerabilities (2 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-2015:0807-1 (see also SUSE bugzilla) Related CVEs: CVE-2014-2977 CVE-2014-2978 Upstream summary: Multiple integer signedness errors in the Dispatch_Write function in proxy/dispatcher/idirectfbsurface_dispatcher.c in DirectFB 1.4.13 allow remote attackers to cause a denial of […]

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Oracle Linux 8 — subversion:1.10 — vulnerability — patch and remediation guide — diagnosis and fix on Oracle Linux 8

Oracle Linux 8 — subversion:1.10 — vulnerability — patch and remediation guide (ELSA-2021-0507)

🟠 High   ⏱ 15–60 min  Last verified: 22 February 2020 Affected versions: Oracle Linux 8 📖 ~4 min read  •  Source: ELSA advisory ELSA-2021-0507 Related CVEs: CVE-2020-17525 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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Oracle Linux 8 — firefox — vulnerability — patch and remediation guide — diagnosis and fix on Oracle Linux 8

Oracle Linux 8 — firefox — vulnerability — patch and remediation guide (ELSA-2019-3196)

🔴 Critical   ⏱ 15–90 min  Last verified: 22 February 2020 Affected versions: Oracle Linux 8 📖 ~4 min read  •  Source: ELSA advisory ELSA-2019-3196 Related CVEs: CVE-2019-11759 CVE-2019-11764 CVE-2019-11758 CVE-2019-11761 CVE-2019-11762 CVE-2019-11760 Table of contents Symptom & Impact Environment & Reproduction Root Cause Analysis Quick Triage Step-by-Step Diagnosis Solution – Primary Fix Solution – […]

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How to Secure MySQL on RHEL 8 — step-by-step RHEL 8 tutorial on Progressive Robot

How to Secure MySQL on RHEL 8

MySQL ships with several default settings and accounts that must be hardened before the server handles production data. On RHEL 8, the combination of mysql_secure_installation, strict privilege grants, TLS enforcement, and the audit log plugin provides a strong baseline. This tutorial walks through each layer of MySQL security so that nothing is left at its […]

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