IQSOFT - John Brice Oktatóközpont
ENGEDÉLYEZETT KÉPZÉSEK

Combined C#, C/C++ and Web application security

Tanfolyam célja

Serving teams that use managed code (.NET and ASP.NET typically written in C#) together with native code development (typically C/C++), this training gives a comprehensive overview of the security issues in both environments.

Concerning C/C++, common security vulnerabilities are discussed, backed by practical exercises about the attacking methods that exploit these vulnerabilities, with the focus on the mitigation techniques that can be applied to prevent the occurrences of these dangerous bugs, detect them before market launch or prevent their exploitation.

The course also covers both the various general (like web services) and specific security solutions and tools, and the most frequent and severe security flaws of managed code, dealing with both language-specific issues and the problems stemming from the runtime environment. The vulnerabilities relevant to the ASP.NET platform are detailed along with the general web-related vulnerabilities following the OWASP Top Ten list. The course consists of a number of exercises through which attendees can easily understand and execute attacks and protection methods.

  •     Understand basic concepts of security, IT security and secure coding
  •     Learn Web vulnerabilities beyond OWASP Top Ten and know how to avoid them
  •     Learn about XML security
  •     Learn how to set up and operate the deployment environment securely
  •     Learn client-side vulnerabilities and secure coding practices
  •     Learn to use various security features of the .NET development environment
  •     Have a practical understanding of cryptography
  •     Realize the severe consequences of unsecure buffer handling in native code
  •     Understand the architectural protection techniques and their weaknesses
  •     Realize the severe consequences of unsecure buffer handling
  •     Learn about typical coding mistakes and how to avoid them
  •     Get sources and further readings on secure coding practices
Tematika
  •     IT security and secure coding
  •     Web application security
  •     Client-side security
  •     .NET security architecture and services
  •     Practical cryptography
  •     x86 machine code, memory layout and stack operations
  •     Buffer overflow
  •     Some additional native code-related vulnerabilities
  •     Common coding errors and vulnerabilities
  •     Principles of security and secure coding
  •     Knowledge sources

1. IT security and secure coding

  •         Nature of security
  •         What is risk?
  •         IT security vs. secure coding
  •         From vulnerabilities to botnets and cybercrime
    •             Nature of security flaws
    •             Reasons of difficulty
    •             From an infected computer to targeted attacks
    •             The Seven Pernicious Kingdoms
    •             OWASP Top Ten 2017

    Web application security

  •         Injection
    •             Injection principles
    •             SQL injection
      •                 Exercise – SQL Injection
      •                 Exercise – SQL injection
      •                 Typical SQL Injection attack methods
      •                 Blind and time-based SQL injection
      •                 SQL injection protection methods
    •             Other injection flaws
      •                 Command injection
      •                 Command injection exercise – starting Netcat
      •                 Case study – ImageMagick
      •                 Cookie injection / HTTP parameter pollution
      •                 Exercise – Value shadowing
  •         Broken authentication
    •             Session handling threats
    •             Session fixation
    •             Exercise – Session fixation
    •             Session handling best practices
    •             Setting cookie attributes – best practices
  •         Sensitive data exposure
    •             Sensitive data exposure
    •             Transport layer security
  •         XML external entity (XXE)
    •             XML Entity introduction
    •             XML bomb
    •             Exercise – XML bomb
    •             XML external entity attack (XXE) – resource inclusion
    •             XML external entity attack – URL invocation
    •             XML external entity attack – parameter entities
    •             Exercise – XXE attack
    •             Preventing entity-related attacks
    •             Case study – XXE in Google Toolbar
  •         Broken access control
    •             Typical access control weaknesses
    •             Insecure direct object reference (IDOR)
    •             Exercise – Insecure direct object reference
    •             Protection against IDOR
    •             Case study – Facebook Notes
    •             Failure to restrict URL access
  •         Security misconfiguration
    •             Configuration management
    •             Hardening
    •             Patch management
    •             ASP.NET components and environment overview
    •             Insecure file uploads
    •             Exercise – Uploading executable files
    •             Filtering file uploads – validation and configuration
  •         Cross-Site Scripting (XSS)
    •             Persistent XSS
    •             Reflected XSS
    •             DOM-based XSS
    •             Exercise – Cross Site Scripting
    •             Exploitation: CSS injection
    •             Exploitation: injecting the tag
    •             Exercise – HTML injection with base tag
    •             XSS prevention
    •             Output encoding API in C#
    •             XSS protection in ASP.NET – validateRequest
    •             Web Protection Library (WPL)

2. Web application security

  •         Insecure deserialization
    •             Deserialization basics
    •             Security challenges of deserialization
    •             Deserialization in .NET
    •             From deserialization to code execution
    •             POP payload targeting MulticastDelegate (C#)
    •             Real-world .NET examples of deserialization vulnerabilities
    •             Issues with deserialization – JSON
  •         Using components with known vulnerabilities
    •             Vulnerability attributes
    •             Common Vulnerability Scoring System – CVSS

    Client-side security

  •         JavaScript security
  •         Same Origin Policy
  •         Cross Origin Resource Sharing (CORS)
  •         Exercise – Client-side authentication
  •         Client-side authentication and password management
  •         Protecting JavaScript code
  •         Exercise – JavaScript obfuscation
  •         Clickjacking
    •             Clickjacking
    •             Exercise – Do you Like me?
    •             Protection against Clickjacking
    •             Anti frame-busting – dismissing protection scripts
    •             Protection against busting frame busting
  •         AJAX security
    •             XSS in AJAX
    •             Script injection attack in AJAX
    •             Exercise – XSS in AJAX
    •             XSS protection in Ajax
    •             Exercise CSRF in AJAX – JavaScript hijacking
    •             CSRF protection in AJAX
  •         HTML5 security
    •             New XSS possibilities in HTML5
    •             HTML5 clickjacking attack – text field injection
    •             HTML5 clickjacking – content extraction
    •             Form tampering
    •             Exercise – Form tampering
    •             Cross-origin requests
    •             HTML proxy with cross-origin request
    •             Exercise – Client side include

    .NET security architecture and services

  •         .NET architecture
  •         Code Access Security
    •             Full and partial trust
    •             Evidence classes
    •             Permissions
    •             Code access permission classes
    •             Deriving permissions from evidence
    •             Defining custom permissions
    •             .NET runtime permission checking
    •             The Stack Walk
    •             Effects of Assert()
    •             Class and method-level declarative permission
    •             Imperative (programmatic) permission checking
    •             Exercise – sandboxing .NET code
    •             Using transparency attributes
    •             Allow partially trusted callers
    •             Exercise – using transparency attributes

    Practical cryptography

  •         Cryptosystems
    •             Elements of a cryptosystem
  •         Symmetric-key cryptography
    •             Providing confidentiality with symmetric cryptography
    •             Symmetric encryption algorithms
    •             Block ciphers – modes of operation
  •         Other cryptographic algorithms
    •             Hash or message digest
    •             Hash algorithms
    •             SHAttered
    •             Message Authentication Code (MAC)
    •             Providing integrity and authenticity with a symmetric key
    •             Random numbers and cryptography
    •             Cryptographically-strong PRNGs
    •             Hardware-based TRNGs
  •         Asymmetric (public-key) cryptography
    •             Providing confidentiality with public-key encryption
    •             Rule of thumb – possession of private key
    •             Combining symmetric and asymmetric algorithms
  •         Public Key Infrastructure (PKI)
    •             Man-in-the-Middle (MitM) attack
    •             Digital certificates against MitM attack
    •             Certificate Authorities in Public Key Infrastructure
    •             X.509 digital certificate

3. x86 machine code, memory layout and stack operations

  •         Intel 80x86 Processors – main registers
  •         Intel 80x86 Processors – most important instructions
  •         Intel 80x86 Processors – flags
  •         Intel 80x86 Processors – control instructions
  •         Intel 80x86 Processors – stack handling and flow control
  •         The memory address layout
  •         The function calling mechanism in C/C++ on x86
  •         Calling conventions
  •         The local variables and the stack frame
  •         Function calls – prologue and epilogue of a function
  •         Stack frame of nested calls
  •         Stack frame of recursive functions

    Buffer overflow

  •         Stack overflow
    •             Buffer overflow on the stack
    •             Overwriting the return address
    •             Exercises – introduction
    •             Exercise BOFIntro
    •             Exercise BOFShellcode
    •             Exercise BOFShellcode – spot the bug!
  •         Protection against stack overflow
    •             Specific protection methods
    •             Protection methods at different layers
    •             The PreDeCo matrix of software security
    •             Stack overflow – Prevention (during development)
    •             Stack overflow – Detection (during execution)
    •             Fortify istrumentation (FORTIFY_SOURCE)
    •             Exercise BOFShellcode – Fortify
  •         Stack smashing protection
    •             Stack smashing protection variants
    •             Stack smashing protection in GCC
    •             Exercise BOFShellcode – Stack smashing protection
    •             Effects of stack smashing protection
    •             Bypassing stack smashing protection – an example
    •             Overwriting arguments – Mitigation
  •         Address Space Layout Randomization (ASLR)
    •             Randomization with ASLR
    •             Using ASLR
    •             Circumventing ASLR: NOP sledding
  •         Non executable memory areas – the NX bit
    •             Access Control on memory segments
    •             The Never eXecute (NX) bit
    •             Exercise BOFShellcode – Enforcing NX memory segments
  •         Return-to-libc attack – Circumventing the NX bit protection
    •             Circumventing memory execution protection
    •             Return-to-libc attack
    •             Exercise BOFShellcode – The Return-to-libc attack
  •         Return oriented programming (ROP)
    •             Exploiting with ROP
    •             ROP gadgets
    •             ROP gadget - Register fill with constants
    •             ROP gadget – Memory write
    •             Combining the ROP gadgets
    •             Real ROP attack scenarios
  •         Heap overflow
    •             Memory allocation managed by a doubly-linked list
    •             Buffer overflow on the heap
    •             Steps of freeing and joining memory blocks
    •             Freeing allocated memory blocks
    •             Case study – Heartbleed
      •                 TLS Heartbeat Extension
      •                 Heartbleed – information leakage in OpenSSL
      •                 Heartbleed – fix in v1.0.1g
      •                 Protection against heap overflow

    Some additional native code-related vulnerabilities

  •         Boundary violation
    •             Array indexing – spot the bug!
    •             Off-by-one and other null termination errors
    •             The Unicode bug
  •         Code quality problems
    •             Poor code quality – spot the bug!
    •             Unreleased resources
    •             Type mismatch – Spot the bug!
    •             Exercise TypeMismatch
    •             Memory allocation problems
      •                 Smart pointers
      •                 Zero length allocation
      •                 Double free
      •                 Mixing delete and delete[]
    •             Use after free
      •                 Use after free – Instance of a class
      •                 Spot the bug
      •                 Use after free – Dangling pointers
    •             Case study - WannaCry
      •                 The WannaCry ransomware
      •                 The vulnerability behind WannaCry – spot the bug!
      •                 Lessons learned
  •         Race condition
    •             Serialization errors (TOCTTOU)
    •             Attacks with symbolic links
    •             Exercise TOCTTOU
  •         Case study - the Shellshock bash vulnerability
    •             Shellshock – basics of using functions in bash
    •             Shellshock – vulnerability in bash
    •             Exercise - Shellshock
    •             Shellshock fix and counterattacks
    •             Exercise – Command override with environment variables

 4. Common coding errors and vulnerabilities

  •         Input validation
    •             Input validation concepts
    •             Integer problems
    •                 Representation of negative integers
    •                 Integer ranges
    •                 Integer overflow
    •                 Integer problems in C/C++
    •                 The integer promotion rule in C/C++
    •                 Arithmetic overflow – spot the bug!
    •                 Exercise IntOverflow
    •                 What is the value of Math.Abs(int.MinValue)?
    •                 Signedness bug – spot the bug!
    •                 Integer truncation – spot the bug!
    •                 Integer problem – best practices
    •                 Case study – Android Stagefright
    •             Path traversal vulnerability
      •                 Path traversal mitigation
    •             Unvalidated redirects and forwards
    •             Log forging
      •                 Some other typical problems with log files
  •         Improper use of security features
    •             Typical problems related to the use of security features
    •             Insecure randomness
      •                 Weak PRNGs in C and C++
      •                 Stronger PRNGs in C
      •                 Weak PRNGs in .NET
    •             Password management
      •                 Exercise – Weakness of hashed passwords
      •                 Password management and storage
      •                 Brute forcing
      •                 Special purpose hash algorithms for password storage
      •                 Argon2 and PBKDF2 implementations in C/C++
      •                 bcrypt and scrypt implementations in C/C++
      •                 Argon2 and PBKDF2 implementations in .NET
      •                 bcrypt and scrypt implementations in .NET
      •                 Case study – the Ashley Madison data breach
      •                 Typical mistakes in password management
      •                 Exercise – Hard coded passwords
    •             Insufficient anti-automation
      •                 Captcha
      •                 Captcha weaknesses
    •             Accessibility modifiers
      •                 Accessing private fields with reflection in .NET
      •                 Exercise Reflection – Accessing private fields with reflection

    Common coding errors and vulnerabilities

  •         Improper error and exception handling
    •             Typical problems with error and exception handling
    •             Empty catch block
    •             Overly broad catch
    •             Using multi-catch
    •             Catching NullReferenceException
    •             Exception handling – spot the bug!
    •             Exercise – Error handling
    •             Exercise – Information leakage through error reporting
  •         Code quality problems
  •             Dangers arising from poor code quality
    •             Serialization – spot the bug!
    •             Exercise – Serializable sensitive
    •             Private arrays – spot the bug!
    •             Private arrays – typed field returned from a public method
    •             Class not sealed – object hijacking
    •             Exercise – Object hijacking
    •             Immutable string – spot the bug!
    •             Exercise – Immutable strings
    •             Using SecureString

    Principles of security and secure coding

  •         Matt Bishop’s principles of robust programming
  •         The security principles of Saltzer and Schroeder

    Knowledge sources

  •         Secure coding sources – a starter kit
  •         Vulnerability databases
  •         .NET secure coding guidelines at MSDN
  •         .NET secure coding cheat sheets
  •         Recommended books – C/C++
  •         Recommended books – .NET and ASP.NET
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Előfeltételek

Advanced C/C++, C# and Web development

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