Security Architecture and Design

Lesson 13: Threats to web and cloudRequired Readings Chapter 13, “Web and Cloud Threats”Assignment Article/paper review
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ISOL 536
Security Architecture and Design
Threat Modeling
Session 13a
Web Threats
Cloud Threats
Agenda
• Web threats
• Cloud threats
• Reading: Chapter 13
Web Threats
• The web is software like other software
• There are specific attack classes like Cross Site
Scripting (XSS)
– In much the same way that stack smashing is a
“feature” of C or other weakly typed languages
– Threat modeling not needed to help find these
– Finding these in TM is a distraction from the
unique threats to your software
Web Site Threats
• Attack surface/Trust boundaries
• Dependencies
• Not showing outbound links
– Is Google analytics safe? (We hope so—it’s on
each page!)
• Model helps you consider
each part &
Browser
relationships
Google Analytics
Threatmodelingbook.
com
Web hosting
Textbook web site
DB
Browser Threats
• Mostly the job of a small number of browser
makers
• Your job when writing a plugin
– Manage security & privacy
• Literature reviews & careful checking of
browser API guidance
Cloud Threats
• New insiders
– At the cloud provider — How do they compare to
other IT outsourcing?
• New trust boundary (update your diagram)
– Co-tennants as threats
• Compliance threats
– Regulation: what needs to be compliant?
– Audit & logging: what’s logged where and how?
– Can your controls migrate?
Cloud Threats (2)
• Legal
– In US, subpoena rules change if you give your data
to others (“3rd party doctrine”)
• May affect privacy expectations
• Forensic
– Can you get the hard drives, etc for analysis?
• Integrity
– Creation and management of virtual machines
Recap
• To threat model web sites, focus on
dependencies and unique functionality
• Cloud: focus on trust boundaries

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