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Extended Web application security in C#

CYDCsWeb4d
4 days
On-site or online
Hands-on
C#
Developer
Instructor-led
Pricing Inquiry Download PDF
labs

31 Labs

case_study

20 Case Studies

Platform

Web

Audience

C# developers working on Web applications

Preparedness

General C# and Web development

Standards and references

OWASP, CWE and Fortify Taxonomy

Group size

12 participants

Outline

  • Cyber security basics
  • The OWASP Top Ten 2025
  • Wrap up

What you will learn

  • Getting familiar with essential cyber security concepts
  • Managing vulnerabilities in third party components
  • Understanding Web application security issues
  • Detailed analysis of the OWASP Top Ten elements
  • Putting Web application security in the context of C#
  • Going beyond the low hanging fruits
  • Understanding how cryptography supports security
  • Learning how to use cryptographic APIs correctly in C#
  • Input validation approaches and principles

Description

Your Web application written in C# works as intended, so you are done, right? But did you consider feeding in incorrect values? 16Gbs of data? A null? An apostrophe? Negative numbers, or specifically -1 or -2^31? Because that’s what the bad guys will do – and the list is far from complete.

Handling security needs a healthy level of paranoia, and this is what this course provides: a strong emotional engagement by lots of hands-on labs and stories from real life, all to substantially improve code hygiene. Mistakes, consequences, and best practices are our blood, sweat and tears.

The curriculum goes through the common Web application security issues following the OWASP Top Ten but goes far beyond it both in coverage and the details.All this is put in the context of C#, and extended by core programming issues, discussing security pitfalls of the C# language and ASP.NET.

So that you are prepared for the forces of the dark side.

So that nothing unexpected happens.

Nothing.

They said about us

”

Class was great!

Pace of the course was just right. Favourite part was reviewing of the ways to hack XML and JSON, and the ways to prevent that. Pretty relevant to what I am currently working on.

Employee at a Global Insurance Group , April, 2019

Norwood, MA, USA

Table of contents

  • Cyber security basics
  • The OWASP Top Ten 2025
    • A01 – Broken Access Control
      • Access control basics
      • Confused deputy
        • Insecure direct object reference (IDOR)
        • Path traversal
        • Lab – Insecure Direct Object Reference
        • Path traversal best practices
        • Authorization bypass through user-controlled keys
        • Case study – Remote takeover of Nexx garage doors and alarms
        • Lab – Horizontal authorization
      • File upload
        • Unrestricted file upload
        • Good practices
        • Lab – Unrestricted file upload
        • Case study – File upload vulnerability in Citrix ShareFile
        • Insecure temporary file
      • Server-side Request Forgery (SSRF)
        • Case study – SSRF and the Capital One breach
    • A02 – Security Misconfiguration
      • Configuration principles
      • Web security configuration issues
        • Content Security Policy
        • Fetch directives
        • Source allowlisting
        • Strict CSP: using nonces and hashes
        • CSP best practices
      • Cookie security
        • Cookie attributes
      • Secrets management
        • Hard coded passwords
        • Best practices
        • Lab – Hardcoded password
      • XML entities
        • DTD and the entities
        • Entity expansion
        • External Entity Attack (XXE)
          • File inclusion with external entities
          • Server-Side Request Forgery with external entities
          • Lab – External entity attack
          • Preventing XXE
          • Lab – Prohibiting DTD
          • Case study – XXE vulnerability in SharePoint
    • A03 – Software Supply Chain Failures
      • Using vulnerable components
      • Untrusted functionality import
      • Supply chain security and the Software Bill of Materials (SBOM)
      • SBOM examples
      • Case study – The Polyfill.io supply chain attack
      • Vulnerability management
  • The OWASP Top Ten 2025
    • A04 – Cryptographic Failures
      • Information exposure
        • Case study – Strava data exposure
      • Cryptography for developers
        • Cryptography basics
        • Crypto APIs in C#
        • Elementary algorithms
          • Hashing
            • Hashing basics
            • Hashing in C#
            • Lab – Hashing in C#
          • Random number generation
            • Pseudo random number generators (PRNGs)
            • Cryptographically secure PRNGs
            • Weak PRNGs
            • Using random numbers in C#
            • Lab – Using random numbers in C#
            • Case study – Equifax credit account freeze
        • Confidentiality protection
          • Symmetric encryption
            • Block ciphers
            • Modes of operation
            • Modes of operation and IV – best practices
            • Symmetric encryption in C#
            • Symmetric encryption in C# with streams
            • Lab – Symmetric encryption in C#
            • Case study – Padding oracle used in RCE against Citrix ShareFile
          • Asymmetric encryption
            • The RSA algorithm
              • Using RSA – best practices
              • RSA in C#
              • Case study – RSA attacks: Bleichenbacher, ROBOT, and Marvin
          • Combining symmetric and asymmetric algorithms
          • Key exchange and agreement
            • Key exchange
            • Diffie-Hellman key agreement algorithm
            • Key exchange pitfalls and best practices
    • A05 – Injection
      • Input validation
        • Input validation principles
        • Denylists and allowlists
        • What to validate – the attack surface
        • Where to validate – defense in depth
        • When to validate – validation vs transformations
        • Validation with regex
      • SQL injection
        • SQL injection basics
        • Lab – SQL injection
        • Attack techniques
        • Content-based blind SQL injection
        • Time-based blind SQL injection
        • SQL injection best practices
          • Input validation
          • Parameterized queries
          • Lab – Using prepared statements
          • Database defense in depth
          • Case study – SQL injection leading to RCE in Ivanti Endpoint Manager
  • The OWASP Top Ten 2025
    • A05 – Injection (continued)
      • Input validation
      • Unsafe reflection
        • Reflection without validation
        • Lab – Unsafe reflection
        • Are accessibility modifiers a security feature?
        • Accessibility modifiers – best practices
      • Code injection
        • OS command injection
          • Lab – Command injection
          • OS command injection best practices
          • Avoiding command injection with the right APIs
          • Lab – Command injection best practices
          • Case study – Command injection in Ruckus
      • HTML injection – Cross-site scripting (XSS)
        • Cross-site scripting basics
        • Cross-site scripting types
          • Persistent cross-site scripting
          • Reflected cross-site scripting
          • Client-side (DOM-based) cross-site scripting
        • Lab – Stored XSS
        • Lab – Reflected XSS
        • Case study – XSS to RCE in Azure Service Fabric
        • XSS protection best practices
          • Protection principles – escaping
          • XSS protection APIs
          • Further XSS protection techniques
          • Lab – XSS fix / stored
          • Lab – XSS fix / reflected
          • Client-side protection principles
          • Additional protection layers – defense in depth
    • A06 – Insecure Design
      • The STRIDE model of threats
      • Secure design principles of Saltzer and Schroeder
        • Economy of mechanism
        • Fail-safe defaults
        • Complete mediation
        • Open design
        • Separation of privilege
        • Least privilege
        • Least common mechanism
        • Psychological acceptability
      • Client-side security
        • Same Origin Policy
          • Simple request
          • Preflight request
          • Cross-Origin Resource Sharing (CORS)
        • Frame sandboxing
          • Cross-Frame Scripting (XFS) attacks
          • Lab – Clickjacking
          • Clickjacking beyond hijacking a click
          • Clickjacking protection best practices
          • Lab – Using CSP to prevent clickjacking
    • A07 – Authentication Failures
      • Authentication
        • Authentication basics
        • Multi-factor authentication (MFA)
        • Case study – The InfinityGauntlet attack
      • Password management
        • Storing account passwords
        • Password in transit
        • Lab – Is just hashing passwords enough?
        • Dictionary attacks and brute forcing
        • Salting
        • Adaptive hash functions for password storage
        • Lab – Using adaptive hash functions in C#
        • Case study – Veeam missing authentication and cleartext password storage
  • The OWASP Top Ten 2025
    • A07 – Authentication Failures (continued)
      • Session handling
        • Session management essentials
        • Why do we protect session IDs – Session hijacking
        • Session fixation
        • Session ID best practices
      • Password policy
    • A08 – Software and Data Integrity Failures
      • Integrity protection
        • Message Authentication Code (MAC)
          • Calculating HMAC in C#
          • Lab – Calculating MAC in C#
        • Digital signature
          • Digital signature with RSA
          • Elliptic Curve Cryptography
            • ECC basics
            • Digital signature with ECC
          • Digital signature in C#
            • Lab – Digital signature with ECDSA in C#
      • Subresource integrity
        • Importing JavaScript
        • Lab – Importing JavaScript
        • Case study – The British Airways data breach
      • Insecure deserialization
        • Serialization and deserialization challenges
        • Integrity – deserializing untrusted streams
        • Integrity – deserialization best practices
        • Look ahead deserialization
        • Property Oriented Programming (POP)
          • Creating a POP payload
          • Lab – Creating a POP payload
          • Lab – Using the POP payload
          • Case study – Deserialization RCE in Veeam
          • Summary – POP best practices
    • A09 – Logging and Alerting Failures
      • Logging and monitoring principles
      • Insufficient logging
      • Case study – Plaintext passwords at Facebook
      • Logging best practices
      • Monitoring best practices
    • A10 – Mishandling of Exceptional Conditions
      • Error and exception handling principles
      • Error handling
        • Returning a misleading status code
        • Information exposure through error reporting
          • Information leakage via error pages
          • Case study – Information leakage via errors in Apache Superset
      • Exception handling
        • In the catch block. And now what?
        • Catching NullReferenceException
        • Empty catch block
        • Catching and throwing SystemExceptions
        • Lab – Exception handling mess
      • Control flow
        • Incorrect block delimitation
        • Dead code
        • Using if-then-else and switch defensively
    • Web application security beyond the Top Ten
      • X01 – Lack of Application Resilience
        • Denial of service
        • Flooding
        • Resource exhaustion
        • Sustained client engagement
        • Denial of service problems in C#
        • Infinite loop
        • Economic Denial of Sustainability (EDoS)
        • Algorithmic complexity issues
          • Regular expression denial of service (ReDoS)
            • Lab – ReDoS
            • Dealing with ReDoS
  • Wrap up
    • Secure coding principles
      • Principles of robust programming by Matt Bishop
    • And now what?
      • Software security sources and further reading
      • .NET and C# resources

Pricing

4 days Session Price

3000 EUR / person

  • Live, instructor led classroom training
  • Discussion and insight into the hacker’s mindset
  • Hands-on practice using case studies based on high-profile hacks and live lab exercises
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