# STRIDE Threat Model
**STRIDE** is a **threat categorization model** developed by **Microsoft** to help security teams systematically identify and assess security threats in applications, networks, and systems. It is particularly useful in **threat modeling**, allowing organizations to anticipate potential attack vectors and implement appropriate mitigations early in the design phase. Each letter in **STRIDE** represents a specific type of threat, covering different security principles such as authentication, integrity, non-repudiation, confidentiality, availability, and authorization. *** ## **Breakdown of STRIDE Threat Categories** ### **1. Spoofing (S) – Identity Impersonation** * **Description:** An attacker **impersonates another entity**, such as a legitimate user, process, or device, to gain unauthorized access to a system or resource. * **Common Examples:** * Using **stolen credentials** or session hijacking to impersonate users. * **DNS spoofing** (redirecting users to malicious sites by altering DNS responses). * **IP spoofing** (forging an IP address to disguise malicious activity). * **Email spoofing** (forging sender addresses to deceive recipients). * **Mitigation Strategies:** * Implement **strong authentication mechanisms** (e.g., Multi-Factor Authentication - MFA). * Use **digital certificates** and cryptographic signing. * Enforce **secure session management** to prevent session hijacking. *** ### **2. Tampering (T) – Data Integrity Violations** * **Description:** An attacker **modifies data, system files, or configurations** to manipulate system behavior, corrupt data, or bypass security controls. * **Common Examples:** * **Modifying logs** to cover tracks. * **Altering transmitted data** via a **Man-in-the-Middle (MitM) attack**. * Injecting **malicious code** into an application (e.g., **SQL injection** or **code injection**). * **Mitigation Strategies:** * Implement **data integrity checks** (e.g., hashing, cryptographic signing). * Enforce **code integrity** with signed and validated software. * Use **secure communication protocols** like TLS to prevent data tampering in transit. *** ### **3. Repudiation (R) – Denying Actions or Transactions** * **Description:** An attacker (or even a legitimate user) **denies performing an action**, making it difficult to trace their activities and hold them accountable. * **Common Examples:** * A user **denies making a financial transaction**, but there’s no proof to validate or dispute the claim. * Attackers deleting or modifying **log files** to erase evidence of their actions. * **Mitigation Strategies:** * Implement **audit logging and digital signatures** to provide non-repudiation. * Use **tamper-resistant logging mechanisms** to prevent log deletion or modification. * Enforce **strict access controls** to prevent unauthorized users from altering logs. *** ### **4. Information Disclosure (I) – Unauthorized Data Exposure** * **Description:** An attacker **gains access to confidential or sensitive information** that they are not authorized to view. This is one of the leading causes of **data breaches**. * **Common Examples:** * **Data leaks** exposing **Personally Identifiable Information (PII)**, credit card numbers, or medical records. * **Unencrypted communications** exposing sensitive data in transit. * **Directory traversal attacks** allowing unauthorized access to restricted files. * **Misconfigured cloud storage (e.g., AWS S3 buckets)** exposing sensitive company data. * **Mitigation Strategies:** * **Encrypt sensitive data** at rest and in transit. * Implement **role-based access controls (RBAC)** and **least privilege principles**. * Regularly **scan and monitor for data leaks** (e.g., DLP solutions). * Use **secure coding practices** to prevent unintended data exposure (e.g., parameterized queries to avoid SQL injection). *** ### **5. Denial of Service (DoS) – Service Disruption** * **Description:** An attacker **disrupts or degrades the availability of a service**, preventing legitimate users from accessing resources. * **Common Examples:** * **Network-based DoS attacks**, such as **DDoS (Distributed Denial of Service)** attacks that flood a server with traffic. * **Application-layer DoS**, such as sending excessive requests to overwhelm a system’s processing capabilities. * **Resource exhaustion attacks**, such as consuming all database connections. * **Mitigation Strategies:** * Deploy **rate limiting** and **traffic filtering** (e.g., Web Application Firewalls - WAFs). * Use **DDoS protection services** (e.g., Cloudflare, AWS Shield). * Implement **auto-scaling and redundancy** to absorb attack impact. *** ### **6. Elevation of Privilege (E) – Unauthorized Access Escalation** * **Description:** An attacker **gains higher-level access** than they should have, potentially leading to full system compromise. * **Common Examples:** * Exploiting **vulnerabilities in applications or OS** to gain **administrator (root) privileges**. * **Privilege escalation attacks**, such as **Windows token manipulation** or **Linux SUID exploits**. * **Bypassing authentication mechanisms** to gain system-level access. * **Mitigation Strategies:** * Apply **principle of least privilege (PoLP)** for user and system permissions. * Regularly **patch and update** software to mitigate privilege escalation exploits. * Monitor and alert on **unexpected privilege escalations** using SIEM solutions. *** ## **Why STRIDE is Important for Security Teams** STRIDE is **commonly used in application security and system threat modeling** to help developers, security teams, and architects proactively identify security risks. By systematically assessing potential threats based on STRIDE, organizations can:\ ✅ **Understand and anticipate security threats before they occur**.\ ✅ **Strengthen security controls** by mapping mitigations to each STRIDE category.\ ✅ **Improve security in software development** by incorporating security-by-design principles.\ ✅ **Enhance incident response and detection** by knowing the types of attacks to monitor. ## **Conclusion** The STRIDE model provides a **structured and effective way** to categorize and address cybersecurity threats. By considering **Spoofing, Tampering, Repudiation, Information Disclosure, Denial of Service, and Elevation of Privilege**, organizations can build **stronger security defenses, reduce risk exposure, and improve overall cybersecurity posture**.