Troubleshooting

Ubuntu 16.04 — pulseaudio — multiple vulnerabilities (4 CVEs) — patch and remediation guide — diagnosis and fix on Ubuntu 16.04

Ubuntu 16.04 — pulseaudio — multiple vulnerabilities (4 CVEs) — patch and remediation guide

  • March 22, 2021
  • Linux
  • Comment off

🟡 Medium   ⏱ 10–30 min  Last verified: 22 March 2021 Affected versions: Ubuntu 16.04 (xenial) 📖 ~4 min read  •  Source: Ubuntu Security Notice USN-4640-1 Related CVEs: CVE-2020-16123 CVE-2020-15710 CVE-2020-11931 https://launchpad.net/bugs/1877102 Upstream summary: James Henstridge discovered that an Ubuntu-specific patch caused PulseAudio to incorrectly handle snap client connections. An attacker could possibly use this […]

Read more
Ubuntu 14.04 — fail2ban — vulnerability — patch and remediation guide — diagnosis and fix on Ubuntu 14.04

Ubuntu 14.04 — fail2ban — vulnerability — patch and remediation guide

  • March 22, 2021
  • Linux
  • Comment off

🟢 Low   ⏱ 5–15 min  Last verified: 22 March 2021 Affected versions: Ubuntu 14.04 (trusty) 📖 ~4 min read  •  Source: Ubuntu Security Notice USN-5232-1 Related CVEs: CVE-2021-32749 Upstream summary: Jakub Żoczek discovered that certain Fail2ban actions handled whois responses in an insecure way. If Fail2ban was configured to use certain mail actions like […]

Read more
openSUSE Tumbleweed — libfreeimage3 — multiple vulnerabilities (5 CVEs) — patch and remediation guide — diagnosis and fix on openSUSE Tumbleweed

openSUSE Tumbleweed — libfreeimage3 — multiple vulnerabilities (5 CVEs) — patch and remediation guide

  • March 22, 2021
  • Linux
  • Comment off

🟠 High   ⏱ 15–60 min  Last verified: 25 May 2026 Affected versions: openSUSE Tumbleweed 📖 ~4 min read  •  Source: SUSE security advisory (see also SUSE bugzilla) Related CVEs: CVE-2020-21428 CVE-2019-12211 CVE-2015-0852 CVE-2016-5684 CVE-2019-12213 Upstream summary: Buffer Overflow vulnerability in function LoadRGB in PluginDDS.cpp in FreeImage 3.18.0 allows remote attackers to run arbitrary code […]

Read more
SLES 12 — glib-networking — vulnerability — patch and remediation guide — diagnosis and fix on SLES 12

SLES 12 — glib-networking — vulnerability — patch and remediation guide

  • March 22, 2021
  • Linux
  • Comment off

🟡 Medium   ⏱ 10–30 min  Last verified: 22 March 2021 Affected versions: SLES 12 📖 ~4 min read  •  Source: SUSE advisory SUSE-SU-2021:3944-1 (see also SUSE bugzilla) Related CVEs: CVE-2020-13645 Upstream summary: In GNOME glib-networking through 2.64.2, the implementation of GTlsClientConnection skips hostname verification of the server's TLS certificate if the application fails to […]

Read more
How to Configure Nginx as a Reverse Proxy on RHEL 7 — step-by-step RHEL 7 tutorial on Progressive Robot

How to Configure Nginx as a Reverse Proxy on RHEL 7

  • March 22, 2021
  • Linux
  • Comment off

How to Configure Nginx as a Reverse Proxy on RHEL 7 A reverse proxy sits in front of one or more backend application servers, forwarding incoming client requests and returning the backend responses. Nginx is exceptionally well-suited for this role due to its event-driven architecture and low memory footprint. On RHEL 7, a common pattern […]

Read more
Arch Linux — dotnet-runtime — multiple vulnerabilities (5 CVEs) — patch and remediation guide — diagnosis and fix on Arch Linux

Arch Linux — dotnet-runtime — multiple vulnerabilities (5 CVEs) — patch and remediation guide

  • March 22, 2021
  • Linux
  • Comment off

🟠 High   ⏱ 15–60 min  Last verified: 25 May 2026 Affected versions: Arch Linux (rolling release) 📖 ~4 min read  •  Source: Arch ASA ASA-202103-20 Related CVEs: CVE-2021-26701 CVE-2021-24112 CVE-2021-1723 CVE-2021-1721 CVE-2021-31204 Upstream summary: Type: arbitrary code execution. Status: Fixed. Affected: 5.0.3.sdk103-2. Fixed in: 5.0.4.sdk104-1. Group: AVG-1698. Table of contents Symptom & Impact Environment […]

Read more
Oracle Linux 8 — redis:6 security, bug fix, and — enhancement update — new behaviour and fixes — diagnosis and fix on Oracle Linux 8

Oracle Linux 8 — redis:6 security, bug fix, and — enhancement update — new behaviour and fixes (ELSA-2022-7541)

  • March 21, 2021
  • Linux
  • Comment off

🟢 Low   ⏱ 5–15 min  Last verified: 21 March 2021 Affected versions: Oracle Linux 8 📖 ~4 min read  •  Source: ELSA advisory ELSA-2022-7541 Related CVEs: CVE-2022-24736 CVE-2022-24735 Table of contents Symptom & Impact Environment & Reproduction Root Cause Analysis Quick Triage Step-by-Step Diagnosis Solution – Primary Fix Solution – Alternative Approaches Verification & […]

Read more
Common Problems 118526

Ubuntu 16.04 LTS – swap not enabled after reboot

  • March 21, 2021
  • Linux
  • Comment off

🟡 Medium   ⏱ 5–30 min  Last verified: 21 March 2021 Affected versions: Ubuntu 16.04 LTS Ubuntu 16.04 Ubuntu 16.04.7 📖 ~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 […]

Read more
Common Problems 115086

RHEL 8 auditd Backlog Limit Reached Drops Security Events

  • March 21, 2021
  • Linux
  • Comment off

🟡 Medium   ⏱ 5–30 min  Last verified: 21 March 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 […]

Read more
Arch Linux — zint — vulnerability — patch and remediation guide — diagnosis and fix on Arch Linux

Arch Linux — zint — vulnerability — patch and remediation guide

  • March 21, 2021
  • Linux
  • Comment off

🟡 Medium   ⏱ 10–30 min  Last verified: 25 May 2026 Affected versions: Arch Linux (rolling release) 📖 ~4 min read  •  Source: Arch ASA ASA-202106-13 Related CVEs: CVE-2021-27799 Upstream summary: Type: arbitrary code execution. Status: Fixed. Affected: 2.9.1-1. Fixed in: 2.9.1-2. Group: AVG-1625. Table of contents Symptom & Impact Environment & Reproduction Root Cause […]

Read more

Tags

AIX AlmaLinux Alpine Linux authentication authorization Backup Recovery Boot Startup Cloud Integration Common Problems Cpu Memory Database Debian Debian 11 Debian 12 Bookworm Debian 13 Trixie DNS Firewall Fix Prevention FreeBSD FreeBSD 12 FreeBSD 13 FreeBSD 14 FreeBSD 15 Kernel Drivers Logging Monitoring Lvm Raid NetBSD Networking openSUSE Operations Oracle Linux Oracle Linux 8 Oracle Linux 9 Package Management Performance Proxy Security Hardening SLES Storage Disk Systemd Services Tls Ssl Troubleshooting ubuntu VPN windows server
CHAT