Lecture 6: Web Security CS /17/2017
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1 Lecture 6: Web Security CS /17/2017
2 2015 Security Incidents
3 Web Vulnerabilities by Year DoS Sql Injection XSS CSRF
4 Vulnerability Occurrence in Applications
5 Vulnerability Occurrence in Applications
6 HTML <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" " <html xmlns=" <head> <meta http-equiv="content-type" content="text/html;; charset=utf-8" /> <title>cs 5431 Spring 2017: Practicum in System Security</title> <link rel="stylesheet" href="style.css" /> <link rel="shortcut icon" href=" /> </head> <body> <div id="canvas"> <div id="header"> <div id="info"> <a href=" <span class="title">cs 5431</span><br /> <span class="subtitle">practicum in System Security</span></a> </div> <div id="logo"> <a href=" src="cslogo.png" alt="cornell Computer Science" /></a> </div> </div> <!--end header--> <div style="clear:both;;"></div> <div id="menu"> <ul> <li><a href="index.html">home</a></li> <li><a href="syllabus.html">syllabus</a></li> </ul> <li><a href="schedule.html">schedule</a></li> <li><a href="project.html">project</a></li>
7 Domain Object Model
8 Same Origin Policy (SOP) Data for accessed by:
9 SOP Exceptions Domain relaxation: document.domain Cross-origin network requests: Access-Control-Allow-Origin Cross-origin client-side communication: postmessage Importing scripts
10 Cross-Site Scripting (XSS) Form of code injection evil.com sends victim a script that runs on example.com
11 Reflected XSS Attack Server Victim Server
12 Reflected XSS Search field on victim.com: Server-side implementation of search.php: <HTML> <TITLE> Search Results </TITLE> <BODY> Results for <?php echo $_GET[term]?> :... </BODY> </HTML> What if victim instead clicks on: <script> window.open( = + document.cookie ) </script>
13 Reflected XSS Attack Server term= <script>... </script> <html> Results for <script> window.open( document.cookie...) </script> </html> Victim Server
14 Stored XSS Attack Server 1 User Victim Inject malicious script Server Victim
15 Stored XSS attack vectors loaded images HTML attributes user content (comments, blog posts)
16 Example XSS attacks
17 XSS Defenses Parameter Validation HTTP-Only Cookies Dynamic Data Tainting Static Analysis Script Sandboxing
18 Vulnerability Occurrence in Applications
19 <html> <head> <title>an Example Page</title> </head> <body> Hello World! </body> </html> HTTP Basics GET /index.html HTTP/1.1 Host: HTTP/ OK Date: Fri, 17 March :10:00 EDT Content-Type: text/html; charset=utf-8 Content-Length: 138 Connection: close
20 Session Management HTTP GET HTTP OK HTTP GET HTTP OK
21 Cookie Side-jacking SSL(login) SSL(redirect;; set-cookie) Request;; cookie=sid
22 FireSheep (October 2010)
23 SSL by Default
24 Cookie Forgery SSL(login) SSL(redirect;; set-cookie) Request;; cookie=ssid
25 Cookie Forgery
26 Malware Targets local browser state
27 Chrome Encrypted Cookies salt is 'saltysalt' key length is 16 iv is 16 bytes of space b' ' * 16 on Mac OSX: password is in keychain: security find-generic-password -w -s "Chrome Safe Storage" 1003 iterations on Chrome OS: password is in keychain: "security find-generic-password -wga Chrome 1003 iterations on Linux: password is peanuts 1 iteration On Windows: password is current user password CryptProtectData uses 4000 iterations
28 Vulnerability Occurrence in Applications
29 Cross-Site Request Forgery (CSRF) Server Victim User Victim Attack Server
30 CSRF Defenses Secret Validation Token: <input type=hidden value=23a3af01b> Referer Validation: Referer: Custom HTTP Header: X- Requested- By: XMLHttpRequest User Interaction (e.g., CAPTCHA)
31 Vulnerability Occurrence in Applications
32 SQL Injection SQL Injection is another example of code injection Adversary exploits user-controlled input to change meaning of database command
33 SQL Injection Web Browser (Client) Enter Username & Password Web Server SELECT * FROM Users WHERE user='me' AND pwd='1234' DB
34 SQL Injection Web Browser (Client) Enter Username & Password Web Server SELECT * FROM Users WHERE user='me' AND pwd='1234' DB What if user = ' or 1=1 --
35 SQL Injection
36 SQLi in the Wild
37 Defenses Against SQL Injection Prepared Statements: String custname = request.getparameter("customername"); // perform input validation to detect attacks String query = "SELECT account_balance FROM user_data WHERE user_name =? "; PreparedStatement pstmt = connection.preparestatement( query ); pstmt.setstring( 1, custname); ResultSet results = pstmt.executequery( ); Input Validation: Case statements, cast to non-string type Escape User-supplied inputs: Not recommended
38 Vulnerability Occurrence in Applications
39 One more thing
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