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1 Overview Cross-Site Scripting (XSS) Christopher Lam Introduction Description Programming Languages used Types of Attacks Reasons for XSS Utilization Attack Scenarios Steps to an XSS Attack Compromises to not fixing CSS/XSS holes Methodology How to protect against XSS Conclusion Introduction Most web sites today contain dynamic content which makes a website more enjoyable By creating a dynamic web site you are making yourself susceptible to a popular and very powerful security vulnerability This threat is called Cross-Site Scripting Also known as XSS, it is defined as the number one and utmost prevalent web site vulnerability on the internet What is a XSS Attack? XSS Attack is a potentially dangerous security vulnerability found in web-based based applications It allows a variety of code to be injected by a malicious user into a webpage XSS is very easy to execute and very long and arduous to repair Takes about 52 days to fix an XSS hole XSS holes are found in commercial products every month During an attack everything looks fine to the end user, but in actuality they are subject to an endless amount of threats Originally known as (CSS) confused for Cascading Style Sheets
2 Programming Languages Utilized in XSS Attacks Sun Microsystems's Java Client-side Script JavaScript Action Script VB Script Microsoft s Active X Adobe s Flash HTML or XHTML RSS and Atom feeds Types of XSS Attacks DOM-Based or Type 0 (Local) Document Object Model Standard object model for representing html or xhtml Problem exists within the page s client side script If an attacker hosts a malicious site, which contains a vulnerable website on a clients local system, a script can be injected Now the attacker can run the privileges of that users browser on their system Local Zone Can be either persistent or non-persistent Types of XSS Attacks (contd.) Non-Persistent or Type 1 (Reflected) Most common type With invalidated user-supplied supplied data in a resulting webpage without html encoding, client-side code can be injected into the dynamic page Then with some social engineering (Manipulating someone to perform actions) An attacker convinces a user to follow a malicious URL which injects code into the resulting page Now the attacker has full access to that pages content
3 Types of XSS Attacks (contd.) Persistent or Type 2 (Stored or Second order) Allows the most powerful kinds of attacks First data is stored in a server provided by a web application It is later shown to a user on a webpage without any html encoding Ex: Online message board that allows users to post messages for other users to read With this method, malicious scripts can be provided more then once An attack can affect a large amount of users and the application can also be infected by a XSS Virus or Worm XSS Attacks Used For: Hijacking Accounts False Advertising & inserting hostile content Cookie theft/poisoning & defacing websites Changing of users settings Conducting phishing attacks Attack Scenario (1 of 3) DOM-Based Attack 1. Mallory sends via a URL of a maliciously constructed webpage to Alice 2. Alice receives and clicks the link 3. The malicious webpage's JavaScript opens up a vulnerable HTML page locally on Alice's computer 4. The vulnerable page containing the JavaScript then executes on Alice s computers local zone 5. Now Mallory's malicious code can run commands with all privileges on Alice s computer Attack Scenario (2 of 3) Non-Persistent Attack 1. Alice visits Bob s website frequently and logs in with a username and password Site stores billing information 2. Mallory notices that Bob s website contains a type 1 XSS vulnerability 3. Mallory then creates a URL to exploit that vulnerability, and then sends Alice an making it look like it came from Bob 4. While logged into Bob s site, Alice views the URL 5. The malicious script then poses as Bob s site, and steals Alice s session cookie and sends it to Mallory 6. With Alice s cookie, Mallory can steal everything
4 Attack Scenario (3 of 3) Persistent Attack 1. Bob hosts a site that allows users to post messages to be viewed by other users at a later time 2. Mallory notices that Bob s site has a Stored XSS vulnerability 3. Mallory then posts a controversial message which encourages more users to view it 4. After viewing the posted message, all the users session cookies are sent to Mallory s web server without them knowing 5. Later on Mallory can log in as whom ever she wants and post messages posing as them Steps to an XSS Attack Select a target Testing Find an XSS hole, and look if it has any cookies If it has a cookie, then you have found a target Insert code or script pointing to the vulnerability Make sure the page does not appear broken XSS Execution Send your crafted URL to launch it (Hex encode it) More experienced attackers would do a few redirects to steal cookies, return to site, then attack them harder Decide what to do with the data After collecting data, see if Account Hijacking is possible Not Fixing CSS/XSS Holes Compromises: Account being taken over Hacker publishing a warning about your company not fixing its problems Damages your companies reputation Lack of security measures Shows clients you are not doing anything Trust issues Why do business with you if there is no trust Methodology Before Implementing XSS custom tag library encoding A Successful XSS Attack that causes a popup to appear in the users browser
5 Methodology (contd.) After Implementing XSS custom tag library encoding The XSS custom tag library makes sure the generated web pages are properly encoded It protects itself from any malicious attack This webpage is displaying erroneous code because the custom tag library prevents insertion of malicious script How to Protect Against XSS < = < ( = ( = " # = # % = % + = + > = > ) = ) = ' & = & ; = ; - = - Never trust Input & Always filter metacharacters View material only from official websites It will eliminate almost 90% of problems Be cautious when reading s, discussion boards, posts, etc. Turn off JavaScript in browser settings In IE, turn security settings on high Custom tag Libraries Conclusion XSS is defined as the number one and utmost prevalent website vulnerability on the internet No one is ever completely safe from XSS Can not be expected to write flawless code or have round the clock personnel to answer all possible vulnerability issues As XSS vulnerabilities continue to grow, the best way to protect yourself from it is to be careful and be aware of its existence References csscript/ Picture References ipting%2bbug.png&imgrefurl= 7A8nC- 4J6Jd1heOY4HEg1bo4YRQ=&h=592&w=709&sz=292&hl=en&start=60&tbnid=bytIySB5LrMoKM:&tbnh=117&tbnw=140&prev=/images %3Fq%3Dcross-site%2Bscripting%26start%3D40%26gbv%3D2%26ndsp%3D20%26hl%3Den%26sa%3DN site%2bscripting%26start%3d40%26gbv%3d2%26ndsp%3d20%26hl%3den%26sa%3dn Script.png&imgrefurl= rjx_euzpz0y8_tewb818rzd8ccs=&h=200&w=200&sz=37&hl=en &start=225&tbnid=5ulzgglj0pphmm:&tbnh=104&tbnw=104&prev=/images%3fq%3dcross- site%2bscripting%26start%3d220%26gbv%3d2%26ndsp%3d20%26hl%3den%26sa%3dn u%25 2Fimages%252Fnews%252Fphishingmoney.jpg%26w%3D218&imgrefurl= and- ebay-hook-up-on-phisher- blocker.aspx&usg= 9kqYJaZ4d7WxWMuzvcv_VENQy6Q=&h=329&w=218&sz=19&hl=en&start=299&tbnid=0A- rllxgiugeqm:&tbnh=119&tbnw=79&prev=/images%3fq%3dcross- site%2bscripting%26start%3d280%26gbv%3d2%26ndsp%3d20%26hl%3den%26sa%3dn
6 THE END! Beware of the Cross - Eyed Scripting Bug!
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