Knowledge Base
Johan Beysen
What is this?
Personal knowledge base for cybersecurity, networking, systems administration, databases, scripting and cloud.
Contents
Ethical Hacking — Web Application Security
| Page |
Topic |
| SQL Injection |
SQLi detection, UNION attacks, blind SQLi, cheat sheet |
| Broken Access Control |
IDOR, privilege escalation |
| Horizontal & Vertical Access Control |
Concept explanation |
| XSS |
Reflected, stored, DOM-based, filter bypasses |
| CORS |
SOP, misconfigurations, exploitation |
| Information Disclosure |
Headers, error pages, .git exposure |
| Authentication Bypass |
Username enumeration, brute force, logic flaws, MFA bypass |
| SSRF |
Server-Side Request Forgery |
| Path Traversal |
Directory traversal attacks |
| File Upload Vulnerabilities |
Upload bypass techniques |
| Server Side Vulnerabilities |
Path traversal, SSRF, file upload, command injection |
| Webapp Pentest Roadmap |
OWASP-based roadmap |
Ethical Hacking — API Security
| Page |
Topic |
| Nmap |
Port scanning, service detection, NSE scripts |
| Mimikatz |
Credential dumping, Kerberos, DCSync |
| Atomic Red Team |
Detection validation, purple teaming, ATT&CK |
| AMSI Testing |
Antimalware Scan Interface testing |
| EICAR Testing |
AV validation with the EICAR test file |
| Arya |
OT/ICS security scanner |
Cybersecurity
| Page |
Topic |
| Cybersecurity Intro |
CIA, cryptography, frameworks, GDPR, IAM, PKI, firewalls |
| Cybersecurity S1 |
DDoS, SSH/TLS, IDS/IPS/NDR, WAF, SIEM, VPN, DNS security, Metasploit |
Networking
| Page |
Topic |
| Datacom & Networking |
OSI model, subnetting, IPv4/IPv6, transport and application layer |
| Wireless |
Radio waves, antennas, Wi-Fi security, site survey |
| Routing & Switching (Cisco) |
IOS, VLANs, STP, EtherChannel, OSPF, ACL/NAT/DHCP |
| STP / Link Aggregation / FHRP |
Redundancy techniques |
| OSPF / BGP / WAN & VPN |
Routing techniques |
| L2 Threats / L2 Security / Endpoint Security |
Security techniques |
| Network Discovery / Port Mirroring |
Optimization techniques |
| Cheatsheet |
Full configuration guide (basics → redundancy → security → routing) |
Linux
Server Management
| Page |
Topic |
| Server Management Intro |
Hyper-V, Windows Server, Active Directory, storage, DHCP/DNS |
| Server Management Advanced |
PXE, GPO, FSMO, NTFS/AGDLP, file sharing, redundancy, backup/recovery |
Cloud & Infrastructure
| Page |
Topic |
| SNB Project |
CAMPUS design, Azure/M365/Entra/Intune, TrueNAS/ESXi/iSCSI, IIS/NGINX, Docker, Ansible |
Databases
| Page |
Topic |
| Planning & Installation |
Lab architecture, installation, service accounts |
| SQL Processes & Databases |
Services, system databases, recovery models |
| Logins, Users & Permissions |
Logins vs. users, server/database roles, GRANT/DENY |
| Managed Service Accounts |
sMSA/gMSA for SQL Server services |
| Backup & Restore |
Full/differential/log backups, restore order |
| DDL / DQL / DML |
T-SQL language |
| Views, Stored Procedures & Functions |
Database objects |
| Import & Export |
Moving data between systems |
| Migration & Scalability |
Scaling and migrating databases |
| Task Automation |
SQL Server Agent, maintenance plans |
| Performance & Indexing |
Indexes and query performance |
| Reporting Services |
SSRS |
| Troubleshooting |
Problem-solving approach |
| Cheatsheet |
Full T-SQL reference |
Scripting
Auditing & Monitoring
| Page |
Topic |
| Cheatsheet |
Logging, Linux/Windows monitoring, Zabbix, SNMP |
Regulations
| Page |
Topic |
| NIS2 |
NIS2 directive and Cyfun framework |
Other
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