Security

What is ARP Spoofing? ARP Spoofing is a network attack technique that exploits structural vulnerabilities in the ARP (Address Resolution Protocol), which was standardized through RFC 826 by the IETF in 1982. The attacker sends falsified ARP messages to the network to manipulate the victim’s ARP cache table and intercept or modify normal communication flows. This attack is a form of Man-in-the-Middle (MITM) attack. It is possible because the ARP protocol prioritized efficiency over security during its design phase and did not include authentication or integrity verification mechanisms. ...

What is a Reverse Shell? A reverse shell is an attack technique that reverses the direction of typical remote access connections. The compromised target system initiates a connection to the attacker’s system, allowing the attacker to access the target’s shell. This remote command execution mechanism exploits a fundamental characteristic of modern network security architectures. Most networks implement “block inbound, allow outbound” firewall policies, and reverse shells bypass this by having the target initiate the connection. This enables attackers to access systems behind restrictive network environments, NAT configurations, and corporate firewalls. ...

Overview In the previous post, we configured DDNS and port forwarding to enable external internet access to homelab Kubernetes cluster services. This post covers how to install and configure HashiCorp Vault to securely manage sensitive information like passwords, API keys, and certificates in the Kubernetes cluster. Limitations of Default Kubernetes Secrets Secret management was the biggest challenge while building the homelab environment using GitOps methodology. Several limitations became clear when using default Kubernetes Secrets. ...

OAuth 2.0 is an authorization framework standardized as RFC 6749 by the IETF (Internet Engineering Task Force) in 2012, designed to allow users to grant third-party applications limited access to their resources without exposing their credentials (passwords). It is currently adopted as the standard for social login and API authorization by most major internet services including Google, Facebook, GitHub, and Twitter. The Origins of OAuth The Problem OAuth Solves Before OAuth, users had to directly provide their usernames and passwords to third-party applications, which created serious security risks. Users had no way to know which applications would safely manage their credentials, nor could they granularly control access permissions or revoke them at any time. ...

Web Authentication is a core mechanism designed to solve the user identification problem arising from the stateless nature of the HTTP protocol. Since Lou Montulli of Netscape Communications invented cookies in 1994, authentication has evolved from session-based to token-based approaches. Modern web applications widely use hybrid methods combining JWT and Refresh Tokens to satisfy both security and scalability requirements. Understanding Authentication and Authorization The Difference Between Authentication and Authorization Authentication is the process of confirming “who you are” by verifying a user’s identity, while Authorization is the process of determining “what you can do” by granting access permissions to specific resources for authenticated users. Authentication must be performed before authorization is possible, and these two concepts should be clearly distinguished. ...