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Web Application Security

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Get your hands on our Web Application Security PPT template to describe the techniques and tools that help secure web applications, web servers, and online services to keep sensitive data confidential. Cyber security experts and application security analysts can use this fully editable deck to highlight the significance of these tools and techniques in scanning the applications for vulnerabilities and securing them by implementing the best security practices. You can also use this set to discuss the role of web application security in preventing website attacks that often cause the loss of customer data, revenue, and customer trust. 

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Grab our feature-rich Web Application Security PowerPoint template to describe the process of enforcing policies, tools, and other security measures to safeguard confidential and sensitive data stored online from unauthorized breaches or modifications.

Cybersecurity experts can leverage these PowerPoint slides to demonstrate types of web application security tests, common attacks against web applications, and the working mechanism of web application firewalls. The deck can be harnessed to depict the web application security's checklists and vulnerabilities and best practices to mitigate them.

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Web Application Security intro

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In this digital era, organizations and industries are moving towards replacing websites with web applications for many obvious reasons. With this transition towards web-based applications, organizations and industries find themselves surrounded by several threats and vulnerabilities. One of the largest concerns is keeping their infrastructure safe from attacks and misuse. Web security entails applying a set of procedures and practices, by applying several security principles at various layers to protect web servers, web users, and their surrounding environment. In this paper, we will discuss several attacks that may affect web-based applications namely: SQL injection attacks, cookie poisoning, cross-site scripting, and buffer overflow. Additionally, we will discuss detection and prevention methods from such attacks.

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The Internet, and in particular the World Wide Web, have become one of the most common communication mediums in the World. Millions of users connect everyday to different web-based applications to search for information, exchange messages, interact with each other, conduct business, pay taxes, perform financial operations and many more. Some of these critical web-based services are targeted by several malicious users intending to exploit possible weaknesses and vulnerabilities, which could cause not only the ...

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Abstract Web applications are increasingly popular victims of security attacks. Injection attacks, such as Cross Site Scripting or SQL Injection, are a persistent problem. Even though developers are aware of them, the suggested best practices for protection are error prone: unless all user input is consistently filtered, any application may be vulnerable. When hosting web applications, administrators face a dilemma: they can only deploy applications that are trusted or they risk their system's security.

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Web application security PowerPoint Presentation Templates and Google Slides

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Application Security PowerPoint and Google Slides Themes

Application Security Presentation Slides

Are you ready to enhance your application security? Application security is the practice of protecting software applications from vulnerabilities, threats, and attacks by implementing preventive measures, secure coding practices, and regular testing and monitoring. Discover the three core principles of Application Security: prevention, detection, and response, and learn how to implement robust measures to defend against vulnerabilities. Our dynamic presentation template provides an engaging visual platform to educate and empower your audience with essential knowledge for securing their applications effectively.

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Web Application Security

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Web Application Security - PowerPoint PPT Presentation

Web Application Security

It is said that if you know both the, enemy and yourself, you will fight a ... create 'booby-trapped' session ids to detect brute forcing attempts ... – powerpoint ppt presentation.

• Presented by
• Joseph Seaman, CISSP, CISA, GSEC
• Jseaman_at_entint.com
• October 8, 2003
• Top Ten Web Vulnerabilities
• Security goes beyond establishing a firewall and implementing SSL.
• Includes IDS, Policy, Standards, Awareness, Audit, Testing, Testing, and Testing.
• Do not assume someone else is taking care of it.
• Sweat the easy stuff!!!
• Unvalidated Parameters
• Broken Access Control
• Broken Account and Session Management
• Cross-site Scripting(XSS) Flaws
• Buffer Overflows
• Command Injection Flaws
• Error Handling Problems
• Insecure Use of Cryptography
• Remote Administration Flaws
• Web and Application Server Misconfiguration
• Parameters should validate
• Data Type(string, Integer, real etc)
• Allowed character set
• Minimum and maximum length
• Whether null is allowed
• Whether the parameter is required or not
• Whether duplicates are allowed
• Numeric range
• Specific legal values(enumeration)
• Specific patterns( regular expressions)
• Specific Access control issues
• Insecure IDs
• Forced Browsing Past Access Control Checks
• Path Traversal
• File Permissions
• Client Side caching
• Critical areas
• Password Change Controls
• Password Strength/Storage
• Protecting Credentials in Transit
• Session ID Protection
• Account Lists
• Browser Caching
• Trust Relationships
• Backend Authentication
• Session IDs are commonly stored in cookies and/or URLs, and hidden fields of web pages (or some combination)
• Session ID generated by WEB SERVER (IIS, etc.) when the user first hits the site or by WEB APPLICATION (ATG dynamo, Apache Tomcat, BEA Websphere, .jsp, .asp, perl, etc.) when the user logs in
• Weak Algorithm Many web sites today are currently using linear algorithms based on easily predictable variables such as time or IP address.
• No Form of Account Lockout Can perform Session ID brute force attacks without a single complaint from the web server.  
• Short Key Space Even the most cryptographically strong algorithm still allows an active Session ID to be easily determined if the size of the strings key space is not sufficiently large.
• Indefinite Expiration on Server allow an attacker unlimited time to guess a valid Session ID.  
• Transmitted in the Clear For those situations where SSL is not being used while the Session ID cookie is transmitted to and from the browser, the Session ID could be sniffed across a flat network taking the guess-work out.
• Insecure Retrieval By tricking the users browser into visiting another site, attacker can retrieve stored Session ID information and quickly exploit before the users sessions expire. This can be done a number of ways DNS poisoning, Cross-site Scripting, etc.
• This technique is used pass various types of client-side scripting language through implemented security filters.
• The idea is to be able to achieve client-side execution of a client-side script.
• There are several techniques used to perform this attack.
• Includes system calls, shell commands and SQL calls(SQL injection)
• Limit use of shell commands
• Validate data against malicious content
• Treat supplied parameters as data
• Limit privileges
• By URL hex encoding URL strings, it may be possible to circumvent filter security systems and IDS.
• http//www.myweb.com/cgi?file/etc/passwd
• http//www.myweb.com/cgi?file/2F657463
• 2F706173737764
• Round 1 Decoding
• scripts/..255c../winnt
• scripts/..5c../winnt
• (25 Character)
• Round 2 Decoding
• scripts/..\../winnt
• In unicode, c0af, is the equivilent to a slash (/).
• Therefore the common URL IIS exploit
• scripts/..c0af../winnt
• scripts/../../winnt
• Define policy
• Limit only what is necessary
• Invalid account
• Incorrect password
• Common mistakes include
• Insecure storage of keys, certificates, and passwords
• Improper storage of secrets in memory
• Poor sources of randomness
• Poor choice of algorithm
• Failure to encrypt critical data
• Attempting to invent a new encryption algorithm
• Failure to include support for encryption key changes and other required maintenance procedures
• Restrict access through front door
• Use VPN or SSL whenever possible
• Segment and Filter access
• Use strong authentication
• Configure all security mechanisms
• Turn off all unused services
• Set up roles, permissions, and accounts
• Logging and alerts
• Monitor for latest vulnerabilities
• Patch, Patch, Patch
• Vulnerability Scanning
• All HTML is to be considered dangerous, but these tags are the most insidious.
• ltFRAMESETgt
• Logout of all sessions when done
• Do not select the Remember me Option
• Protect your cookies! Desktop Security
• Ensure you use SSL when given choice of standard / secure login
• Patch your browser to be safe from some nasty Cross-site Scripting attacks
• Treat emails with Session ID info in URLs just as securely as username/passwords
• Build and require SSL (or other encryption) into the web application so that the authentication token can not be easily sniffed in transit between browser and server
• Ensure that all cookies enable the "secure" field
• Provide a logout function that expires all cookies and other authentication tokens
• Re-authenticate the user before critical actions are performed (i.e. a purchase, money transfer, etc.)
• Regenerate the Session ID after certain intervals (30, 15 min. ,etc.)
• Create booby-trapped Session IDs to detect brute forcing attempts
• When practical, limit successful sessions to specific IP addresses. Only works in intranet setting where ranges are predictable and finite.
• Auto-expire sessions after 15 minutes of inactivity
• Enforce a nonce on previous pages
• Visual Testing WebSleuthhttp//www.sandsprite.c om/Sleuth/
• WebProxy -http//www.atstake.com/webproxy/
• HTTPush - http//sourceforge.net/projects/httpush
• Achilles - http//www.mavensecurity.com/achilles
• MiniBrowser - aignes.com/download.htm
• Open Web Application Security Project (OWASP) http//www.owasp.org
• OWASP is an open source community project staffed entirely by volunteers from across the world. The project is developing software tools and knowledge based documentation that helps people secure web applications and web services.
• The OWASP Guide to Building Secure Web Applications and Web Services
• http//www.owasp.org/documentation/
• CGI SECURITY, http//www.cgisecurity.net
• Web Application Security Mailing List, http//online.securityfocus.com/archive/107
• MIT Publications http//pdos.lcs.mit.edu/cookies/p ubs.html
• Dos and Don'ts of Client Authentication on the Web

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Web Application Security

Mar 19, 2019

300 likes | 434 Views

Web Application Security. (and why it matters to YOU!) By Mark Bristow and Doug Wilson. Your presenters today. Doug Wilson Security Lead and Network/Systems Engineer for EMIB at NIH [email protected] Mark Bristow Application Security Engineer at GAO

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• web applications
• web services
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Presentation Transcript

Web Application Security (and why it matters to YOU!) By Mark Bristow and Doug Wilson

Your presenters today • Doug Wilson • Security Lead and Network/Systems Engineer for EMIB at NIH • [email protected] • Mark Bristow • Application Security Engineer at GAO • [email protected] (and yes, we are “security guys”)

Why we are here A brief discussion on • What is Web Application Security? • Why does it matter to you? • Instances of real-world problems . . . • And what you can do to remediate them.

What is Web Application Security? (the elevator speech)

Web application security is . . . An overall process that • Starts in the initial planning stages • Requirements gathering • Business logic • Application structure and design • Continues through • Coding • Testing • Deployment • And doesn’t finish until • The full lifecycle of the application • Including decommissioning

But why should this matter to me? • No one would ever bother with my web site. • We already have “security” • We use open source -- it has peer review • We use a vendor -- it has the vendor backing it and they are getting better these days • We keep up on patches/versions/revisions • “So we have a firewall, an IDS, an IPS, and use SSL . . . we’re covered . . . right?”

The time to fix this is NOW • The web was designed as a trusted environment. It is NOT that anymore. • Web technologies allow a degree of interoperability and integration of data never before dreamed of, for good and for bad. • Web applications are still “emerging technologies” for most organizations. • The drive to stay competitive results in unrealistic expectations and unsafe practices.

Recent IT nightmares • VA and other government agencies • PII for 26.5 million veterans • TJ Maxx and credit card processing • 45 million credit card numbers • AOL and User Data • 19 million queries from 650,000 subscribers • PaineWebber logic bomb • 2000 servers, over $3.1 million just to restore

Web App specific numbers • Symantec ISTR Jul-Dec 2006 (from March 2007) • 2,526 vulnerabilities in 2006 (second half) • 66% affected Web Applications!!! • Government Sector had the highest percentage of data breaches that could lead to identity theft • CIO Magazine interviews Jeremiah Grossman (5/07) • Vulnerabilities in 80% of websites analyzed • Remaining 20% are mostly static sites • Most C-level execs they talk to think firewalls protect against web application attacks -- THIS IS NOT TRUE!!!

The bottom line -- Liability • Liability is not only very costly, it can damage intangibles. • Public sector groups often care more about intangibles. Private sector financial damages can put you out of business. • Regardless of the who the bad guy is, the liability lies with the people who create and maintain these systems and their management.

OWASP Top 10 • Cross Site Scripting (XSS) • Injection Flaws • Malicious File Execution • Insecure Direct Object Reference • Cross Site Request Forgery (CSRF) • Information Leakage and Error Handling • Broken Authentication and Session Management • Insecure Cryptographic Storage • Insecure Communications • Failure to Restrict URL Access

Cross Site Scripting • What is Cross Site Scripting? • Getting the user to execute arbitrary code in their web browser • Why is XSS So Dangerous? • Compromise victim computer • Can steal user’s authentication credentials • Intranet Port scanning • Stealing Sensitive Data • Key/Mouse logging • WebWorms • XSS is everywhere • FBI, AOL, HBO, CNN, BBC, FOX, Weather.com… to name a few

Injection Flaws • Come in many flavors: SQL, LDAP, XPath, XSLT, HTML, XML, OS command injection, and more • SQL Injection • What is SQL injection? • Injecting code to modify the intent of a SQL query • What happens if I set my password to ‘ OR ‘z’=‘z? • What can I do with SQL Injection? • Break or bypass Authentication • Has the potential to expose your database data to an attacker • Attacker can potentially modify your database structure and data Select * from users where uname =‘’ and pw=‘’OR ‘Z’=‘Z’ p\/\/nd

Fixing Injection Flaws • The top two flaws are based on Injection • Most of these are easily solved by following a few simple concepts religiously, in the way that works for your environment. • Don’t trust ANYTHING that comes from the client. Ever. • Validate and type all input as strictly as you can. • Encode and control all output as strictly as you can.

Malicious File Execution • Often found when developers directly use user input with file streams • Can allow for remote code execution, root kit installation and more. • Include $userinput.”.php”

Insecure Direct Object Reference • Occurs when a resource object is directly called via user input. • Examples • Directory Traversal • Source code disclosure

Fixing Object Access Flaws • Don’t trust ANYTHING that comes from the client. Ever. • Validate and type all input as strictly as you can. • Encode and control all output as strictly as you can. • Do you sense a trend here? • In fact, let’s talk about this for a moment

Input and Output • Input Validation • Client side -- doesn’t really do anything for security, though it still has its uses • Server side – The only place where your validation provides security • Double-escaping and understanding the logic of how this works • Regex – Your new best friend <3 • Output Encoding • Output should be encoded to match the delivery medium • HTML Entity encoding will stop 99% of XSS attacks • < = &lt; > = &gt; & = &amp; ……

Mechanics of good Validation • Techniques • White listing – Pass only when content contains only known good input • Black Listing – Fail when a known bad is detected • Sanitization – “Clean” data before using it based on Black or White List • Examples • Lets generate a white list for a “name” field • Lets generate a black list for the same “name” field

Sanitization Issues • Lets sanitize the name field against script injection • String name = request.getParameter( "name" ); • name.replaceALL(“script”, “”); • out.println(name); • Is this a white or black list? • Test cases • Name = “<script>alert(‘I pwnt j00’);</script>” • Result: <>alert(‘I pwnt j00’);</> • Name = “<scrscriptipt>alert(‘I pwnt j00’);</scrscriptipt>” • Result: <script>alert(‘I pwnt j00’);</script> • Sometimes this is a necessary evil • How would you take care of a text area?

Object Access, Part II • This (and other things on the list) is not strictly a code issue • Server configuration is also key, and flaws in server software need to be patched ASAP. • If you don’t need the functionality in the application, don’t have it, or make sure you do it safely.

Cross Site Request Forgery (CSRF) • When an attacker forces a victim’s browser to submit a request the victim did not intend to submit • Also known as a “One click attack” or session riding or XSRF • Exploits pre-established trust relationship (session) to force authorization • High remediation costs • Malicious requests and legitimate requests are indistinguishable. • Origionally dates to 1998 but is just becoming well understood • Example • Victim logs into their bank website • Victim views attacker’s blog or infected page • CSRF Exploit initiates a request to the bank website to make a money transfer • User’s state automatically appended to CSRF Request • Bank sees an authenticated and valid request to the transfer action to transfer funds and executes it • Attacker gets victim’s money

Fixing CSRF • CSRF is often labeled as “unfixable,” it’s inherent in how the web works. But you can take steps to help. • Problems and safeguards • Data returned as javascript (Gmail) -- fixed by while(); loop • Digg article -- fix: secret tokens • Amazon One-Click -- fix: Password re-entered • Fixes work -- unless you combine with XSS. Then the rules change, and some standard fixes go out the window (like secret tokens)

The rest of the OWASP Top 10 • Information Leakage • Error messages provide vital tools to an attacker • Broken Session Management • Insecure Cryptographic Storage • Insecure Communications • SSL is a web attacker’s best friend • Failure to restrict URL access • What happens when I request an admin page directly without logging in first? • “Logic flaws” and why they are only really found by people.

The AJAX question • Does AJAX and other similar technologies make for “worse” application security? What about web services? • Hot topic of debate -- Asynchronous applications and web services aren’t innately more “insecure,” but greatly increase complexity and attack surface. • Both Asynchronous and Web Service style applications have the potential to reintroduce a lot of old problems, and hide exploitation from being readily visible. • Minimalist approach is best

The Sky is Falling? • The sky is NOT falling! • All of the vulnerabilities mentioned here can be fixed • Developer education and a robust software security program can help mitigate these issues • Educate yourselves • Educate your customers

Pick a place, we can add security • Already up and running? • Assessments -- Humans and Tools • Managed Services • WAF/IPS/IDS -- Monitor, Monitor, Monitor!!!! • Deployment • Make sure it’s secure before it goes out the door • Development • Educate your developers • Code review -- Humans and Tools • Architecture • Educate your architects • consider security from day one

How do I get started? • LEARN! What threats are out there and how they apply to your organization? • Classify what data is most important to your organization • Identify all of your web applications and assign them criticalities based on business needs and data classification • Perform vulnerability assessments to determine how big the problem is • “Bake security in” to your SDLC

Resources • Sites • http://www.owasp.org • http://www.webappsec.org/ • http://ha.ckers.org • http://www.sans-ssi.org/ • Books • How to Break Web Software • Hacking Exposed : Web Applications • XSS ATTACKS • Training • Certified Ethical Hacker (CEH) • Foundstone Ultimate Web Hacking • SANS Training • Securing Critical Web Applications and Web Services (Aspect Security) • Writing Secure Web Applications: Developer Training

Questions? Doug Wilson -- [email protected] Mark Bristow -- [email protected]

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