Course 46 - CompTIA Cybersecurity Analyst | Episode 28: AAA Protocols, System Management, and Key Vulnerabilities

Identity Security Fundamentals: AAA, Directory Services, and Identity ThreatsEpisode OverviewThis episode provides a comprehensive introduction to digital identity, directory services, authentication protocols, and the security threats that target identity infrastructure.It begins with the fundamentals of establishing and managing digital identities, then explores the AAA framework—Authentication, Authorization, and Accounting. The episode continues into centralized directory architectures such as LDAP and Microsoft Active Directory, along with technologies that support centralized authentication, Single Sign-On, and federated identity. Finally, it examines common attack vectors targeting users, endpoints, applications, and identity configurations.Key Topics Covered1. Digital Identity Fundamentals and the Three A's Digital Identity: Understand how attributes, identifiers, credentials, and authentication factors contribute to establishing and validating a digital identity. Authentication: Determine whether a user, device, or service is genuinely the identity it claims to be. Authorization: Determine what an authenticated identity is permitted to access or perform. Accounting: Record and audit authentication, authorization, and other relevant activities to provide visibility and support investigations. Identity Lifecycle: Consider how identities are created, provisioned, modified, reviewed, disabled, and eventually removed. Least Privilege: Limit permissions to those necessary for an identity's legitimate responsibilities. 2. Directory Services and Identity ArchitectureCentralized directory services provide structured repositories for identities, groups, organizational information, and access-related data. LDAP: Explore the Lightweight Directory Access Protocol and its role in accessing and managing directory information. Microsoft Active Directory: Understand how Active Directory organizes users, computers, groups, and policies within domain-based environments. Organizational Units (OUs): Use hierarchical structures to organize objects and support administration and policy application. Access Control: Apply appropriately scoped ACLs and permissions to protect directory objects and administrative functions. Directory Encryption: Protect directory communications using secure transport mechanisms such as LDAP over TLS (LDAPS) or StartTLS where supported and properly configured. Credential Protection: Store passwords using modern, salted, slow password-hashing mechanisms rather than reversible encryption or obsolete hashing algorithms. Directory Hardening: Restrict administrative privileges, protect privileged accounts, monitor authentication activity, and minimize unnecessary exposure of directory services. 3. Network Authentication and Federated IdentityThe episode also examines technologies that extend centralized identity management across networks and applications. RADIUS: Explore the Remote Authentication Dial-In User Service and its use in centralized authentication and authorization for network access and related services. Single Sign-On (SSO): Reduce repeated authentication prompts by allowing users to authenticate through a trusted identity system and access multiple authorized services. Federated Identity: Allow identities managed by one trusted domain or identity provider to be used across other services through established trust relationships. OpenID Connect: Understand the modern identity layer built on OAuth 2.0 that enables applications to authenticate users and obtain standardized identity information. OAuth 2.0: Distinguish OAuth's primary role as an authorization framework from authentication protocols such as OpenID Connect. 4. Identity Infrastructure Threat VectorsIdentity systems represent a high-value target because compromised credentials or excessive privileges can provide access to multiple systems.Personnel and Social Engineering Phishing: Trick users into revealing credentials, approving fraudulent authentication requests, or interacting with malicious content. Social Engineering: Manipulate users into bypassing established security procedures or disclosing sensitive information. Insider Threats: Address risks arising from authorized users who intentionally or unintentionally misuse their access. Endpoint and Credential Threats Keylogging: Capture keystrokes or authentication information through malicious software or compromised systems. Token Theft: Target authentication sessions, cookies, or other credential artifacts to bypass normal authentication processes. Endpoint Compromise: Recognize that a compromised endpoint can undermine otherwise strong identity controls. Application and Directory Attacks LDAP Injection: Exploit improperly constructed directory queries when applications incorporate untrusted input without appropriate validation and parameterization. Excessive Permissions: Identify risks created by unnecessary privileges, poorly configured ACLs, inherited permissions, and unmanaged privileged accounts. Authentication Weaknesses: Assess weak authentication policies, poor credential protection, insufficient MFA, and insecure session management. Identity Security WorkflowEstablish Identity → Authenticate → Authorize → Record Activity → Monitor → Detect Anomalies → Review Privileges → Respond to Threats → Reassess AccessKey Takeaways Digital identity security extends beyond usernames and passwords to include identity attributes, credentials, authentication factors, permissions, sessions, and lifecycle management. The AAA framework separates proving identity, granting access, and recording activity into distinct security functions. LDAP and Active Directory provide centralized mechanisms for organizing and managing identities and related directory information. Directory services should be protected through secure communications, strong credential protection, restrictive access controls, privileged-account protection, and continuous monitoring. RADIUS, SSO, and federated identity can simplify centralized access management while introducing important trust and configuration considerations. OAuth 2.0 and OpenID Connect serve different but complementary purposes: OAuth focuses on delegated authorization, while OpenID Connect provides an identity/authentication layer. Identity infrastructure can be attacked through users, endpoints, applications, credentials, and misconfigured permissions. A strong identity security program combines least privilege, strong authentication, secure directory architecture, monitoring, and continuous access review. 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