Are you fighting new threats with old weapons? Secure your Web applications with Web Application Firewalls.
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1 White paper Cyberoam Application Visibility and Control Anti-Spam Bandwidth Management VPN Web Application Firewall Firewall Intrusion Prevention System Anti-Virus & Anti-Spyware On-Appliance Reporting Web Filtering Are you fighting new threats with old weapons? Secure your Web applications with Web Application Firewalls.
2 Introduction Web applications have increased the speed and accessibility to business information for an organization s customers, partners and employees. And at the same time, delivering tangible savings. Business applications for accounting, collaboration, customer relationship Management (CRM), Enterprise Resource Management (ERP), content management, online banking, E-commerce, and many more, are all available on the Web and all of them house valuable, sensitive data! Unfortunately, hackers realized this much before organizations could. Today, Web applications are the most common target for attack by hackers because they are ubiquitous and provide easy entry to virtually any organization s lucrative data. SQL injection, cross-site scripting (XSS), cross-site request forgery (CSRF), OS command injection, session hijacking and buffer overflows are the most commonly used attacks targeting Web applications hosted within an organization s local network or in private data centers. Risk! Theft of Intellectual property! Identity and information theft! Loss of revenue, brand, customers! Fines and lawsuits from failure in regulatory compliance! Threat to National security Web Applications Benefits! E-commerce! Information delivery vehicle for partners, employees, customers! Accelerated pace of business! Reduced business costs A study done by Ponemon Institute in 2011 reveals that 73 percent of organizations have been hacked in the last 24 months as a result of weakness in their web applications! Sadly, 69% of organizations surveyed relied on the security of their traditional network firewalls to protect web applications. This whitepaper will examine the variety of web application attacks hitting organizations today and discuss why traditional network firewalls are not capable of defending against them. A new breed of Web Application Firewalls is the solution to protect corporate data, observe regulatory compliance like the PCI DSS, and safeguard their brand, reputation and customers.
3 Web Application Security should not be ignored! Montana-based broker-dealer D.A. Davidson & Co. had to cough out $375,000 after the Financial Industry Regulatory Agency (FINRA) found it to be neglectful in protecting the personal data of 192,000 of its clients. The data, which resided in a database on a Web server, was compromised as the result of a SQL Injection attack launched by Latvian cyber criminals. The Company s web facing applications were left wide open to the point that the database was never encrypted nor was the default password changed, leaving it blank. Vulnerabilities in Web Applications Rising with their Numbers Organizations continuously develop new web-based applications to meet their product or service promotional needs. The high-pressure environment this creates for programmers is less than ideal for developing never-ending enhancements and new functionality. Without rigid secure software development practices, inserting even the smallest piece of code on the website can lead to serious vulnerabilities. Besides, logic flaws, forgotten backup files, debug code, and other production-related vulnerabilities are a regular challenge to the security of websites and other Web applications in organizations. Securing the bigger picture around Web Applications There are many Web application attacks that have nothing to do with developers and coding errors. Many times the threat comes from the language, protocol or the platform that supports the delivery of these applications. In other words, the environment surrounding the web applications. The main reason the majority of Web application attacks are successful today is due to the fact that the attackers come in the same way any legitimate user would all without disturbing the sanctity of RFC s or W3C standards. WEB APPLICATION DATA APPLICATION(HTTP) OSI Layer 5-7 TRANSPORT(TCP/UDP) OSI Layer 4 NETWORK(IP) OSI Layer 3 HARDWARE OSI Layer 1-2 Web applications reside at the top of the OSI stack and are practically cutoff from the rest of the network and application layers in the stack. They have no control or visibility in the layers underneath them. When attackers exploit the HTTP/TCP behavior, like in the case of Layer 7 DoS attack, neither the Web application nor the developer has no knowledge of the exploit. This is where Web Application Firewalls help to add an extra layer of security to secure Web applications. Web Application Firewalls have the ability to understand the bigger picture surrounding the applications. They look at every request and response within the HTTP/HTTPS/ Web Service layers and understand the context in which to evaluate the behavior of requests, thereby blocking Web application attacks.
4 Common Web Application Attacks SQL Injection In an SQL injection attack, the attacker gains access to the entire contents of a backend database including identity information by bypassing authentication to gain unauthorized access. Here, the input validation vulnerabilities are exploited in the application code to send unauthorized SQL commands to a back-end database. Common Web Application Attacks! SQL Injection! Cross-site Scripting! Worms! URL Parameter Tampering! Cross-site Request Forgery (CSRF)! OS command injection! Session Hijacking Cross-site Scripting Cross-site scripting attacks the application code by exploiting script injection vulnerabilities where malicious HTML tags or client-side scripting code is injected into HTML form fields and a customer s login credentials redirected to an attacker. Worms Worms take advantage of vulnerabilities in commercial software platforms and operating systems. Code Red, Nimda, and MSBlaster are some examples of worm infections that spread at an astounding rate, sometimes affecting hundreds of thousands of servers within minutes. URL Parameter Tampering This type of attack involves manipulation of parameters exchanged between client and server. The attacker alters the URL query string parameter values in the browser s address bar to change application data such as user credentials, permissions, and other information. Cross-site Request Forgery (CSRF) CSRF forces the authenticated user of an application to send an HTTP request to a target destination, desired by the attacker, without the user s knowledge or intent. This results into data theft and in case of a full-blown attack, it can compromise the entire web application. OS command injection OS Command Injection exploits vulnerabilities that occur during the design and development of applications. In this, the attacker takes advantage of an application vulnerability that results in execution of system-level commands. Session Hijacking Session Hijacking exploits a valid computer session by stealing or predicting a valid session token and gains unauthorized access to information or services on the Web server.
5 Traditional Network Security Solutions Prove Inadequate for Securing Web Applications Effective web application security requires understanding of a user s interaction with web applications session IDs, cookies, URLs, HTTP methods, and more. Many organizations rely on their network firewalls and intrusion prevention system to overcome web application threats. But this is how traditional security solutions fall short: Many organizations rely on their network firewalls and intrusion prevention system to overcome web application threats. But traditional security solutions fall short of protecting against Web application attacks. Network Firewalls Part of the reason why we need Web Application Firewalls today is the network firewalls! Although network firewalls protect against network layer attacks, they ought to allow HTTP and HTTPS traffic to the Web servers. Hackers have been using this fact to embed attacks like SQL injection and Cross-Site Scripting (XSS) into Web traffic using allowed application protocols, which are ignored by network firewalls and pass through them, uninterrupted.besides, network firewalls work over the third and fourth of the seven layers of the OSI network model and do not understand protocols and languages like, HTML and XML, have no means of controlling/filtering sensitive data included in server responses, lack ways to detect tampering of parameters in a URL request, cannot validate user inputs to an HTML application and most importantly, they lack awareness about session data, limiting their effectiveness against web application attacks. Intrusion Prevention System Intrusion Prevention System can look into a packet s payload and compare it with a list of known signatures/attacks. Hence, they are effective against worms and other attacks based on known software vulnerabilities but are largely ineffective against web application attacks targeting unknown vulnerabilities in application code or vulnerabilities arising out of poor coding. Web Application Firewalls the only Answer to Web Application Security Web Application Firewalls sit between the web client and a web server to analyze OSI Layer 7 messages for violations in the programmed security policy to protect websites and web applications from attacks. They function bi-directionally by intercepting incoming Layer 7 attacks before reaching the Web server. In addition, they also analyze Web server responses to protect against potential risks of information leakage in organizations. Placed right in front of the Web server, it becomes the last and first stop for information requests to be entertained, as well as the information delivery process. PCI-DSS and Web Application Security Web applications have been declared as the initial point of attack on cardholder data. Requirement 6.6 of the Payment Card Industry Data Security Standard requires organizations to ensure that web facing applications should be protected by installing an application-layer firewall in front of them, or by having all custom application code reviewed for common vulnerabilities by an organization that specializes in application security. With the Code review technique turning out to be expensive and tedious, Web application firewall comes out to be the only option left with organizations. Web application firewalls perform a deep packet inspection of incoming traffic to detect threats, thereby creating a security layer in
6 front of the application itself that ensures security of the web server that secures credit card and other sensitive data, which needs to be protected under the PCI DSS requirements. Cyberoam Web Application Firewall Cyberoam Web Application Firewall is available as a subscription on Cyberoam Network Security appliances (UTM, NGFW). It follows the positive security model based on its Intuitive Website Flow Detector to secure websites and Web-based applications against attacks like SQL injection, cross-site scripting (XSS), URL parameter tampering, session hijacking, buffer overflows, and more-- including the OWASP Top 10 Web application vulnerabilities. Web User Client /Partner SQL Injection, cookie poisoning, XSS,... Web & Application Cyberoam Server Web Application Firewall Database Server Hacker Cyberoam Web Application Firewall Protection against Web-based Application Attacks Cyberoam Web Application Firewall is deployed to intercept the traffic to and from the Web servers to provide an added layer of security against attacks before they can reach the Web applications. Its Intuitive Website Flow Detector intelligently self-learns the legitimate behavior and response of Web applications. Based on the Intuitive Website Flow Detector, the Web Application Firewall ensures the sanctity of Web applications in response to server requests, protecting them against Web application attacks. Cyberoam Web Application Firewall looks at every request and response within the HTTP/HTTPS/Web Service layers. It is effective at repelling attacks from a wide range of commercial and open-source automated vulnerability scanners (e.g. Nessus, WebInspect), as well as hand-crafted attacks. Conforms to HTTP specification? Matches a user-defined policy? Adheres to Intuitive Website Flow Detector? PS HTTP/HTT HTTP Protocol Specification I Intuitive Website Flow Detector User-defined policies Request is legitimate and adheres to the Intuitive Website Flow Detector s selflearning in the past, when such a request was last made to the Web server. The server request was not found valid under the Intuitive Website Flow Detector s knowledge from the past the requested URL cannot be the entry point and it is, hence, blocked from reaching the Web server and the browser receives an HTTP 403 Forbidden response code. No other information is exposed as decided under the User Defined Policy. sales@cyberoam.com The request doesn t pass any of the 3 validation steps. Web server is thus protected from present/future URL-based HTTP attacks.
7 Features: Positive protection model without Signature Tables The Cyberoam Web Application Firewall enforces a positive security model through Intuitive Website Flow Detector to automatically identify and block all applicationlayer attacks without relying on signature tables or patternmatching techniques. The Web Application Firewall considers defined Web application behavior as good. Any deviation is considered bad, or malicious, and is blocked accordingly. This provides security against zeroday attacks and eliminates the need to manually populate and update signature tables. The Intuitive Website Flow Detector automatically adapts to changes in the website. Comprehensive business logic protection The Cyberoam WAF protects against attacks like SQL injection,cross-site scripting (XSS),and cookie-poisoning that seek to exploit business logic behind Web applications, ensuring they are used exactly as intended. HTTPS () encryption Offloading Attackers cannot bypass the Cyberoam WAF protection measures through an HTTPS () connection, mostly used in the financial services, healthcare, e-commerce, and other industries that process sensitive data. The WAF not only secures encrypted connections, but also reduces latency of traffic with its offloading capabilities. Instant Web server hardening The Cyberoam WAF instantly shields any Web environment (IIS, Apache, WebSphere, etc.) against the more than 14,000 common server mis-configurations and an ever-expanding universe of known 3rd-party software vulnerabilities. Reverse proxy for incoming HTTP/HTTPS traffic The Cyberoam WAF follows a reverse proxy model for all incoming HTTP and HTTPS traffic which provides an added level of security by virtualizing the application infrastructure. All incoming Web application requests from the Web client terminate at the WAF. Valid requests are submitted to the back-end Web server, hiding the existence and characteristics of originating servers. URL, Cookie, and Form hardening Application-defined URL query string parameters, cookies, and HTML form field values (including hidden fields, radio buttons, checkboxes, and select options) are protected by the Cyberoam WAF. Attempts to escalate user privileges through cookie-poisoning, gain access to other accounts through URL query string parameter tampering, and other types of browser data manipulation are automatically identified and blocked. Monitoring and reporting Cyberoam Web Application Firewall provides alerts and logs that help organizations with information on types of attacks, source of attacks, action taken on them, and more that help comply with the PCI DSS requirements. Additional Features: Block/alert known bad IP addresses Customizable user messages for blocked requests Rate-based connection safeguards Business Benefits! Offers instant protection without requiring changes to existing Web applications when deployed.! Prevents intruders from manipulating web content! Protects data inside the organization from being hacked by exploiting Web application vulnerabilities! Secures corporate brands, trade secrets, and Intellectual Property! Maintains customer confidence in your website s security, especially for banks, e-commerce, and more.! Ensures sensitive information about the environment doesn t go out to hackers by sending customizable error messages to users.! Easy to use with no special training required for administrators! Low maintenance as it automatically adapts to website / web-application changes! Promotes integrity and availability of Web applications! Helps comply with mandatory PCI requirements Cyberoam Awards & Certifications VPNC CERTIFIED Portal Exchange Firefox JavaScript Basic Network Extension Advanced Network Extension VPNC CERTIFIED Basic Interop AES Interop BEST BUY PC PRO RECOMMENDED EDITOR S C H O I C E RECOMMENDS Toll Free Numbers USA : India : APAC/MEA : Europe : C o p y r i g h t Cyberoam Te c h n o l o g i e s Pvt. L t d. A l l R i g h t s R e s e r v e d. Cyberoam & Cyberoam logo are registered trademarks of Cyberoam Technologies Pvt. Ltd. Ltd. /TM: Registered trade marks of Cyberoam Technologies Pvt. Ltd. Technologies or of the owners of the Respective Products/Technologies. Although Cyberoam attempted to provide accurate information, Cyberoam assumes no responsibility for accuracy or completeness of information neither is this a legally binding representation. Cyberoam has the right to change, modify, transfer or otherwise revise the publication without notice. I sales@cyberoam.com
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