Security testing Python Web applications
Your Web application written in Python 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 -231? 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 Python, and extended by core programming issues, discussing security pitfalls of the programming language.
So that you are prepared for the forces of the dark side.
So that nothing unexpected happens.
Nothing.
Paikka
Helsinki
Koulutusmuoto
Classroom
Remote
Kesto
3 päivää
Hinta
1990 €
Target Group
Python developers working on Web applications
Goal
- Getting familiar with essential cyber security concepts
- Understanding Web application security issues
- Detailed analysis of the OWASP Top Ten elements
- Putting Web application security in the context of Python
- Going beyond the low hanging fruits
- Handling security challenges in your Python code
- Identify vulnerabilities and their consequences
- Learn the security best practices in Python
Prerequisites
General Python and Web development
Course Content
Day 1
Cyber security basics
What is security?
Threat and risk
Cyber security threat types
Consequences of insecure software
The OWASP Top Ten
OWASP Top 10 – 2017
A1 - Injection
Injection principles
Injection attacks
- 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
- Additional considerations
- Lab – SQL injection best practices
- Case study – Hacking Fortnite accounts
Code injection
- Code injection via input()
- 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 – Shellshock
- Lab - Shellshock
- Case study – Command injection via ping
Script injection
- Server-side template injection (SSTI)
- Lab – Template injection
- Injection best practices
A2 - Broken Authentication
Authentication basics
Authentication weaknesses
Spoofing on the Web
Case study – PayPal 2FA bypass
Password management, Inbound 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
- Password policy
- NIST authenticator requirements for memorized secrets
- Case study – The Ashley Madison data breach
- The dictionary attack
- The ultimate crack
- Exploitation and the lessons learned
- Password database migration
- (Mis)handling None passwords
Day 2
The OWASP Top Ten
A2 - Broken Authentication
Password management
- Outbound password management: Hard coded passwords, Best practices, Lab – Hardcoded password, Protecting sensitive information in memory, Challenges in protecting memory
Session management
- Session management essentials
- Session ID best practices
- Why do we protect session IDs – Session hijacking
- Session fixation
- Session handling in Flask
- Cross-site Request Forgery (CSRF): Lab – Cross-site Request Forgery, CSRF best practices, CSRF defense in depth, Lab – CSRF protection with tokens
A3 - Sensitive Data Exposure
Information exposure
Exposure through extracted data and aggregation
Case study – Strava data exposure
Error and exception handling principles
A4 - XML External Entities (XXE)
DTD and the entities
Entity expansion
Lab – Billion laughs attack
External Entity Attack (XXE)
- File inclusion with external entities
- Server-Side Request Forgery with external entities
- Lab – External entity attack
- Case study – XXE vulnerability in SAP Store
- Preventing XXE
- Lab – Using non-vulnerable parsers
A5 - Broken Access Control
Access control basics
Failure to restrict URL access
Confused deputy
- Insecure direct object reference (IDOR)
- Lab – Insecure Direct Object Reference
- Authorization bypass through user-controlled keys
- Case study – Authorization bypass on Facebook
- Lab – Horizontal authorization
File upload
- Unrestricted file upload
- Good practices
- Lab – Unrestricted file upload
A6 - Security Misconfiguration
Configuration principles
Python configuration best practices
- Configuring Flask
A7 - 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 in Fortnite accounts
XSS protection best practices
- Protection principles - escaping
- XSS protection APIs in Python
- XSS protection in Jinja2
- Lab – XSS fix / stored
- Lab – XSS fix / reflected
- Additional protection layers
- Client-side protection principles
A8 - Insecure Deserialization
Serialization and deserialization challenges
Deserializing untrusted streams
Deserialization with pickle
Lab – Deserializing with Pickle
Deserialization with PyYAML
Deserializing best practices
Day 3
The OWASP Top Ten
A9 - Using Components with Known Vulnerabilities
Using vulnerable components
Assessing the environment
Hardening
Untrusted functionality import
Malicious packages in Python
Importing JavaScript
Lab – Importing JavaScript
Case study – The British Airways data breach
Vulnerability management
- Patch management
- Vulnerability management
- Vulnerability databases
A10 - Insufficient Logging & Monitoring
Logging and monitoring principles
Insufficient logging
Plaintext passwords at Facebook
Logging best practices
Monitoring best practices
Web application security beyond the Top Ten
Client-side security
Same Origin Policy
- Lab – Same-origin policy demo
- Tabnabbing
- Lab – Reverse tabnabbing
Frame sandboxing
- Cross-Frame Scripting (XFS) attack
- Lab - Clickjacking
- Clickjacking beyond hijacking a click
- Clickjacking protection best practices
- Lab – Using CSP to prevent clickjacking
Common software security weaknesses
Input validation
Input validation principles
- Blacklists and whitelists
- Data validation techniques
- Lab – Input validation
- What to validate – the attack surface
- Where to validate – defense in depth
- How to validate – validation vs transformations
- Output sanitization
- Encoding challenges
- Lab – Encoding challenges
- Validation with regex
- Regular expression denial of service (ReDoS)
- Lab – Regular expression denial of service (ReDoS)
- Dealing with ReDoS
Files and streams
- Path traversal
- Path traversal-related examples
- Lab – Path traversal
- Additional challenges in Windows
- Virtual resources
- Path traversal best practices
- Format string issues
Unsafe native code
- Native code dependence
- Lab – Unsafe native code
- Best practices for dealing with native code
JSON security
- JSON injection
- Dangers of JSONP
- JSON/JavaScript hijacking
- Best practices
- ReactJS vulnerability in HackerOne
Wrap up
Secure coding principles
- Principles of robust programming by Matt Bishop
- Secure design principles of Saltzer and Schröder
And now what?
- Software security sources and further reading
- Python resources
