Logging Monitoring

Ubuntu 14.04 — exim4 — multiple vulnerabilities (20 CVEs) — patch and remediation guide — diagnosis and fix on Ubuntu 14.04

Ubuntu 14.04 — exim4 — multiple vulnerabilities (20 CVEs) — patch and remediation guide

🟠 High   ⏱ 15–60 min  Last verified: 28 April 2023 Affected versions: Ubuntu 14.04 (trusty) 📖 ~4 min read  •  Source: Ubuntu Security Notice USN-6881-1 Related CVEs: CVE-2021-38371 CVE-2023-42117 CVE-2023-42119 CVE-2023-42114 CVE-2023-42115 CVE-2023-42116 CVE-2022-37452 CVE-2020-28007  +12 more Upstream summary: It was discovered that Exim did not enforce STARTTLS sync point on client side. An […]

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Amazon Linux 2 — xmlrpc-c — vulnerability — patch and remediation guide — diagnosis and fix on Amazon Linux 2

Amazon Linux 2 — xmlrpc-c — vulnerability — patch and remediation guide

🔴 Critical   ⏱ 15–90 min  Last verified: 25 May 2026 Affected versions: Amazon Linux 2 📖 ~4 min read  •  Source: Amazon Linux advisory ALAS2-2022-1795 Related CVEs: CVE-2022-25235 Upstream summary: A flaw was found in expat. Passing malformed 2- and 3-byte UTF-8 sequences (for example, from start tag names) to the XML processing application […]

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CentOS Stream 9 — fribidi — multiple vulnerabilities (3 CVEs) — patch and remediation guide — diagnosis and fix on CentOS Stream 9

CentOS Stream 9 — fribidi — multiple vulnerabilities (3 CVEs) — patch and remediation guide

🟡 Medium   ⏱ 10–30 min  Last verified: 28 April 2023 Affected versions: CentOS Stream 9 📖 ~4 min read  •  Source: AlmaLinux/RHEL advisory ALSA-2022:8011 Related CVEs: CVE-2022-25308 CVE-2022-25309 CVE-2022-25310 Upstream summary: FriBidi is a library to handle bidirectional scripts (for example Hebrew, Arabic), so that the display is done in the proper way, while […]

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Oracle Linux 9 — samba security, bug fix, and — enhancement update — new behaviour and fixes — diagnosis and fix on Oracle Linux 9

Oracle Linux 9 — samba security, bug fix, and — enhancement update — new behaviour and fixes (ELSA-2022-8317)

🟡 Medium   ⏱ 10–30 min  Last verified: 27 April 2023 Affected versions: Oracle Linux 9 📖 ~4 min read  •  Source: ELSA advisory ELSA-2022-8317 Related CVEs: CVE-2022-32742 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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Debian 11 — snappy-java — vulnerability — patch and remediation guide — diagnosis and fix on Debian 11

Debian 11 — snappy-java — vulnerability — patch and remediation guide

🟢 Low   ⏱ 5–15 min  Last verified: 27 April 2023 Affected versions: Debian 11 (bullseye) 📖 ~4 min read  •  Source: Debian Security Tracker Related CVEs: CVE-2023-43642 Upstream summary: snappy-java is a Java port of the snappy, a fast C++ compresser/decompresser developed by Google. The SnappyInputStream was found to be vulnerable to Denial of […]

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Common Problems 118418

Release File Expired or Not Yet Valid

🟡 Medium   ⏱ 5–30 min  Last verified: 27 April 2023 📖 ~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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Ubuntu 16.04 — libhtml-stripscripts-perl — vulnerability — patch and remediation guide — diagnosis and fix on Ubuntu 16.04

Ubuntu 16.04 — libhtml-stripscripts-perl — vulnerability — patch and remediation guide

🟢 Low   ⏱ 5–15 min  Last verified: 27 April 2023 Affected versions: Ubuntu 16.04 (xenial) 📖 ~4 min read  •  Source: Ubuntu Security Notice USN-6100-1 Related CVEs: CVE-2023-24038 Upstream summary: It was discovered that HTML::StripScripts does not properly parse HTML content with certain style attributes. A remote attacker could use this issue to cause […]

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Common Problems 117429

Ubuntu 20.04 black screen after login

🟡 Medium   ⏱ 5–30 min  Last verified: 27 April 2023 📖 ~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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Ubuntu 22.04 — lighttpd — multiple vulnerabilities (2 CVEs) — patch and remediation guide — diagnosis and fix on Ubuntu 22.04

Ubuntu 22.04 — lighttpd — multiple vulnerabilities (2 CVEs) — patch and remediation guide

🟢 Low   ⏱ 5–15 min  Last verified: 27 April 2023 Affected versions: Ubuntu 22.04 (jammy) 📖 ~4 min read  •  Source: Ubuntu Security Notice USN-5903-1 Related CVEs: CVE-2022-22707 CVE-2022-41556 Upstream summary: It was discovered that lighttpd incorrectly handled certain inputs, which could result in a stack buffer overflow. A remote attacker could possibly use […]

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