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CSCI 4130 - Intro to Cybersecurity > Web Security - Basics, SOP, Sessions > Flashcards

Web Security - Basics, SOP, Sessions Flashcards

1
Q

Define

Uniform Resource Identifier (URI)

Web Security

A

Identifies a resource (string)

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2
Q

Define

Scheme

Web Security

A

Protocol and framework

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2
Q

Components of Uniform Resource Identifier (URI)

Web Security

A
  • Scheme
  • Authority
  • Path
  • Query
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3
Q

Define

Authority

Web Security

A

Qualifying name (typically DNS host server or IP address)

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4
Q

Define

Path

Web Security

A

Pathname consisting of “/” separated strings

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5
Q

Define

Query

Web Security

A

Application-specific information

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6
Q

Define

Uniform Resource Locator (URL)

Web Security

A

The identifier that contains information on how to locate a existing/available resource

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7
Q

Define

Uniform Resource Name (URN)

Web Security

A

Identifies an entity regardless of availability/existence

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8
Q

Define

Hypertext Markup Language (HTML)

Web Security

A

A language that uses tags and attributes to display a webpage

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9
Q

Define

Javascript

Web Security

A

Powerful script to manipulate client-side data and provides object support

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10
Q

Why is Javascript suitable for HTML?

A

Javascript is weakly and dynamically typed

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11
Q

Define

HTML Frames

Web Security

A

The tag that allows for multiple separate views/pages associated with separate URLS on the same page

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12
Q

Directly visiting a page will lead to which frame?

Web Security

A

Main frame

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13
Q

What does the parent frame do?

Web Security

A

Specify its own style and the placement of the child frame within itself

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14
Q

Define

Hypertext Transfer Protocol (HTTP)

Web Security

A

An application-layer protocol to transfer information between web client and server (typically port 80)

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15
Q

What does a client do during HTTP?

Web Security

A

Opens a connection and sends requests

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16
Q

What does a server do during HTTP?

Web Security

A

Accept client’s connection and sends replies as a response to the requests

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17
Q

HTTP Request Headers specify

Web Security

A
  • Method
  • Resource
  • Protocol version
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18
Q

HTTP Methods

Web Security

A
  • GET()
  • HEAD()
  • POST()
  • PUT()
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19
Q

Define

HTTP Method: GET()

Web Security

A

Reads data from the URL

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20
Q

Define

HTTP Method: HEAD()

Web Security

A

Fetches information about the data resource from the HTTP header

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21
Q

Define

HTTP Method: POST()

Web Security

A

Submits “data” and stores data as value in a variable

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22
Q

Define

HTTP Method: PUT()

Web Security

A

Uploads data to a stored variable under a specific resource

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23
Q

What specifies a resource?

Web Security

A

An absolute URI or relative path

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24
Q

How does an absolute URI request a resource?

Web Security

A

Through proxy

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25
Q

How does a relative path request a resource?

Web Security

A

Through a server that owns the resource

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26
Q

Define

HTTP Response

Web Security

A

The answer or data read by the server

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27
Q

Define

Web Servers

Web Security

A

Something that loops forever to receive HTTP requests and send HTTP responses

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28
Q

Outline a TCP connection

Web Security

A
  1. Client requests to connect with a server
  2. Server accepts connection
  3. Client sends HTTP Request
  4. Server reads and processes HTTP Request
  5. Server writes back HTTP Response
  6. Connection closed
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29
Q

Define

Common Gateway Interface (CGI)

Web Security

A

Protocol for web servers to execute programs and generate pages dynamically

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30
Q

Define

HTML Forms

Web Security

A

Collects data using GET and POST methods

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31
Q

Where is data collected from when an HTML form uses GET()?

Web Security

A

Query

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32
Q

Where is data collected from if an HTML form uses POST()?

Web Security

A

Body

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33
Q

How is data sent back in an HTML form?

Web Security

A

Name-value pair

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34
Q

What happens if data from an HTML form is an empty string?

Web Security

A

Neither name nor value is present

35
Q

Define

Hypertext Processor (PHP)

Web Security

A

Executes the page on the server side

36
Q

Define

Clientside Javascript

Web Security

A

APIs that control web client in an object-oriented way

37
Q

Define

User Agent

Web Security

A

Client side that retrieves and displays web data

38
Q

Define

Document Object Model (DOM)

Web Security

A

Documentation that treats an HTML like a tree structure

39
Q

List the parts of a Document Object Model (DOM)

Web Security

A
  • Node
  • Browser Object Model (BOM)
40
Q

Define

Node in a DOM

Web Security

A

Part of the document

41
Q

Define

Browser Object Model (BOM) in a DOM

Web Security

A

The API to browser properties

42
Q

Javascript security is much like

Web Security

43
Q

What is part of Javascript security?

Web Security

A
  • No access to files/network resources or browser history
  • Windows must be bigger than 100x100 px
44
Q

Describe

Frame Isolation

Web Security

A

Each site is isolated from one another (exception: if it’s the same site)

45
Q

List the types of frame isolation relationships

Web Security

A

Frame-Frame and Frame-Principal

46
Q

Describe

Frame-Frame

Web Security

A
  • canScript(A, B) - can A execute scripts on B?
  • canNav(A, B) - can A change B’s origin?
47
Q

Describe

Frame-Principal

Web Security

A

readCookie(F, D) and writeCookie(F, D) - can frame F perform on domain D?

48
Q

Describe

Same Origin Policy (SOP)

Web Security

A

Isolation of different pages such that a frame in one origin has no access to the resources of a different origin

49
Q

What is an Origin determined by?

Web Security

A

Determined by string matching and URL of a loaded frame’s location

50
Q

What is the tuple for an origin?

Web Security

A

[Protocol, hostname, port]

51
Q

Define

XMLHTTPRequests (XHR)

Web Security

A

Allows Javascript to send HTTP Requests to a server and receive data responses from the same origin

52
Q

Define

HTTP Responses under SOP

Web Security

A

Can interact with other frames from different origins but can’t inspect contents on scripts and resources

53
Q

Ways to relax SOP

Web Security

A
  • Set sites from different origins to be from the same domain
  • Access-Control-Allow-Origin/Cross-Origin resource sharing
  • Cross-document messaging
54
Q

Define

HTTP Authentication

Web Security

A

Basic authentication to deny access until credentials are sent during verification procedures

55
Q

Where can Access Control Policy be placed?

Web Security

A

Directory or global configuration file

56
Q

How can a web application keep track of a state if HTTPs are stateless?

Web Security

A
  • HTTP Cookies
  • Server side sessions
  • Embedding information in returned pages (i.e. hidden vars, modified URLS)
57
Q

Define

Session

Web Security

A

Sequence of HTTP request and responses associated with a user

58
Q

Define

Basic Authentication

Web Security

A

Form to send creditionals to server-side and an authenticator is returned for validation (i.e. cookie)

59
Q

Define

HTTP Cookie

Web Security

A

Small data set from and set by site stored in web broser to maintain a state on client side

60
Q

Where can cookies from domain A send its requests to?

Web Security

A

To domain A

61
Q

What defines the scope of a cookie?

Web Security

A

Domain and path

62
Q

What if no domain is set for a cookie?

Web Security

A

Host-only cookie is set (handled by browser)

63
Q

What happens if a path is specified for a cookie?

Web Security

A

Cookies are used when requesting a page within the path

64
Q

What happens if no path is specified for a cookie?

Web Security

A

Cookies are used for the path of the requested resource

65
Q

What controls the lifetime of a cookie?

Web Security

A

Expires and Max-Age

66
Q

Define

Expires

Web Security

A

When the broswer will delete the cookie

67
Q

What happens if no expiration or max-age is set for a cookie?

Web Security

A

Cookie becomes a session cookie and will expire when the session is completed

68
Q

Define

Secure Cookie

Web Security

A

Tells the browser how to use the cookie in secure/encrypted connections

69
Q

Define

HTTP Only Cookie

Web Security

A

No exposure of the cookie is allowed besides HTTP requests

70
Q

How can a client access a cookie?

Web Security

A
  • Read in scope
  • Sets a new cookie
  • Deletes a cookie
71
Q

SOP: Cookies vs. DOMS

abc.com/x ____ receive cookies for abc.com/y

Web Security

A

Does not receive

72
Q

SOP: Cookies vs. DOM

abc.com/x ____ access the DOM of abc.com/y

A

Can access

73
Q

SOP: Cookies vs. DOM

Using Javascript, why can abc.com/x see the cookies of abc.com/y?

Web Security

A

They share the same domain (abc.com)

74
Q

Ways to indirectly bypass SOP

Web Security

A
  • A related domain attacker controls cookies on another domain
  • Meeting the fixed storage limit of the cookie jar
  • MITM attacks
75
Q

What can a.abc.com do to b.abc.com?

Web Security

A

Influence and control b.abc.com’s cookies

76
Q

Define

Session Fixation Attack

Web Security

A

Where a session ID is overwritten and the session is hijacked

77
Q

How does a session fixation attack happen?

Web Security

A

Attacker gets the ID => victim visits under wrong ID and authenticates => attacker impersonates as victim with the authentication information

78
Q

Defenses against Session Fixations

Web Security

A
  • Update session IDs periodically
  • Initalize cross-site scripting
79
Q

Define

Cross-Site Request Forgery (CSRF)

Web Security

A

Malicious Javascript/server code tricking users to perform acts on a different web application

80
Q

Defenses against Cross-Site Request Forgery (CSRF)

Web Security

A
  • Avoid using GET() when exporting functionality
  • Referer Validation
  • Secure Token Validation
81
Q

Describe

Referer Validation

Web Security

A

Header fields that indicates who initated the request

82
Q

Limitation to Referer Validation

Web Security

A
  • Not always available
  • May leak information
83
Q

If the Referer Validation is none, what are the types of defaults?

Web Security

A
  • Allow: less secure, more usable
  • Deny: more secure, less usable
84
Q

Define

Secure Token Validation

Web Security

A

A randomly generated invisible token on the server side for every user’s action

85
Q

When is a Secure Token obtained?

Web Security

A

If the user explicitly visited the right page

86
Q

What are the goals of web security?

Web Security

A

Protect CIA, privacy, availability, and computing resource

CSCI 4130 - Intro to Cybersecurity (11 decks)

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