CSRF Basics
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Csrf / Xsrf Basics defines CSRF as a type of web application vulnerability that allows a malicious website to send unauthorized requests to a vulnerable website using active sessions of its authorized users. CSRF tricks the victim into loading a page that contains a malicious request, which inherits the victim's identity and privileges to perform an undesired function like changing passwords. CSRF attacks target functions that cause state changes on the server but can also access sensitive data. The synchronizer token pattern is a server-side prevention technique that establishes a token on the server to validate submissions through a corresponding token in a hidden form field, marking tokens as invalid after single use.
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Cross Site Request Forgery (CSRF) Scripting Explained
Cross Site Request Forgery (CSRF) Scripting ExplainedValency Networks Key Points
What is Cross Site Request Forgery (CSRF)?
How Attack Can Happen?
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What is Cross Site Request Forgery (CSRF)?
CSRF is an attack in which attacker forges the request as a trusted user. The request is essentially made to send unintended data to the site. A vulnerable web application assumes that the data is coming from a trusted user.
The root cause is – request coming from browser is trusted by server blindly, if CSRF protection is not implemented.
This “blind trust” lets attacker create a forged request, and make the victim perform that request.
How Attack Can Happen?
Attacker knows about target application, on which the attack is to be performed
Attacker forges request and sends it to victim who may be logged into the website by embedding that forged request into a hyperlink
Victim clicks on it, and unknowingly sends malicious request to website
Website accepts it and processes it. Thus the attacker is successful in performing the attack.
Damages caused by CSRF?
In Net-banking attacker can forge the request and send it to victim to steal money from Victim’s account
Personal health information can be stolen or modified in a hospital database
Attacker force victim to perform unwanted action which affect their profile
Mitigation Techniques
Can be mitigate by two ways
CSRF token (a cookie which is introduced in each form and validated by web app)
Captcha (implemented to ensure that the request is being performed by a human interaction)
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There are lots of defense techniques introduced nowadays and even though the coding methods used by developers are evolving to counter attack cross site scripting techniques, still the security threat persist in many web applications for the following reasons:
• The complexity of implementing the codes or methods.
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What is Cross Site Request Forgery (CSRF)?
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CSRF is an attack in which attacker forges the request as a trusted user. The request is essentially made to send unintended data to the site. A vulnerable web application assumes that the data is coming from a trusted user.
The root cause is – request coming from browser is trusted by server blindly, if CSRF protection is not implemented.
This “blind trust” lets attacker create a forged request, and make the victim perform that request.
How Attack Can Happen?
Attacker knows about target application, on which the attack is to be performed
Attacker forges request and sends it to victim who may be logged into the website by embedding that forged request into a hyperlink
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There are lots of defense techniques introduced nowadays and even though the coding methods used by developers are evolving to counter attack cross site scripting techniques, still the security threat persist in many web applications for the following reasons:
• The complexity of implementing the codes or methods.
• Non-existence of input data validation and output sanitization in all input fields of the application.
• Lack of knowledge in identifying hidden XSS issues etc.
This proposed project report will briefly discuss what cross site scripting is and highlight the security features and defense techniques that can help against this widely versatile attack.
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* Any security issues that are found will be presented to the system owner, together with an assessment of the impact, a proposal for mitigation or a technical solution.
A4 A K S H A Y B H A R D W A J
A4 A K S H A Y B H A R D W A Jbhardwajakshay CSRF, or cross-site request forgery, occurs when a malicious website causes a user's browser to perform unintended actions on a website where the user is authenticated. Attackers can use CSRF to perform actions like transferring money from a user's bank account without their knowledge or consent. To prevent CSRF, websites should use POST requests instead of GET, assign random tokens for requests, and include CSRF protections in frameworks. Major sites have been vulnerable to CSRF in the past, so defenses against it are important.
Understanding CSRF
Understanding CSRFPotato This document discusses cross-site request forgery (CSRF) attacks. It defines CSRF as an attack that forces an authenticated user's browser to execute unwanted actions on a web application. The attacker uses social engineering like links or forms to trick the user into submitting requests. This allows the attacker to perform functions like funds transfers without the user's consent. Common prevention methods like secret cookies, only accepting POST requests, or URL rewriting do not fully prevent CSRF. The document includes examples of CSRF attacks using forms and clickjacking.
2600 Thailand #50 From 0day to CVE
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Cross-Site Request Forgery Vulnerability: “A Sleeping Giant”
Cross-Site Request Forgery Vulnerability: “A Sleeping Giant”Capgemini Cross-site request forgery (CSRF) is a type of attack that forces end users to execute unwanted actions on a web application in which they are currently authenticated. It is currently the fifth-most-risky attack in the OWASP Top 10.
“If you have not taken specific steps to mitigate the risks of CSRF attacks, your applications are most likely vulnerable,” says expert Chris Schiflett.
This presentation provides Java professionals an anatomy of CSRF in Java web applications and answers how to avoid this in new Java applications with a secure design approach and also discusses how to remediate this issue in business-critical legacy Java web applications without redesigning them.
This presentation includes a demo of the vulnerability and the remediation approach.
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http://www.capgemini.com/oracle
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Solving Labs for Common Web Vulnerabilities: A Hands-On Guide
Solving Labs for Common Web Vulnerabilities: A Hands-On GuideBoston Institute of Analytics Dive into the world of web security with this comprehensive presentation on solving labs for common web vulnerabilities. This hands-on guide is designed to help you understand and mitigate vulnerabilities such as SQL Injection, Cross-Site Scripting (XSS), Cross-Site Request Forgery (CSRF), and more. Perfect for cybersecurity students, professionals, and enthusiasts, this presentation provides practical exercises, detailed explanations, and real-world examples to enhance your web security skills. Equip yourself with the knowledge to protect your web applications from the most prevalent threats. for more details visit https://bostoninstituteofanalytics.org/cyber-security-and-ethical-hacking/
Hack using firefox
Hack using firefoxReza Nurfachmi Judul: Hack using Mozilla FireFox
Pembicara: Ahmad Prayitno
Acara: Seminar Internasional Teknomatika
Lokasi: Auditorium UNIS
Tanggal: 23 Oktober 2016
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- 1. Csrf / Xsrf Basics --by Jovin Lobo
- 2. Definition : “CSRF / XSRF (Cross-Site Request Forgery) is a type of web application vulnerability that allows a malicious website to send unauthorized requests to a vulnerable website using active sessions of its authorized users.” --- Samvel Gevorgyan
- 3. OWASP describes CSRF as .... CSRF is an attack that tricks the victim into loading a page that contains a malicious request. It is malicious in the sense that it inherits the identity and privileges of the victim to perform an undesired function on the victim's behalf like change the victim's e-mail address, home address, or password..etc So basically CSRF attacks target functions that cause a state change on the server but can also be used to access sensitive data.
- 5. DEMO
- 6. Prevention techniques that SUCK !!! ✗ Secret cookies ✗ Accepting only POST requests ✗ Multi-Step transactions
- 7. Then how do we prevent it ?? “Adding any 'unpredictable' parameter to the requests should solve the problem............... What Say ??”
- 8. Some prevention techniques that DO NOT SUCK ... ✔ Challenge-Response : ➢ Re- Authentication. ➢ Implement CAPTCHAS. ✔ Synchronizer Token Pattern
- 9. Synchronizer Token Pattern Its a Server-Side Solution. Concept: Establish a token on the server side that indicates a valid submission, and give a token signature to the client that corresponds to that token (most likely in a hidden input field). When the client submits their form, the server validates their token and proceeds. It then marks the token as invalid so it may not be used again. The result is that any given form may only be used once and then will not work again.
- 11. Control flow with invalid tokens Ref : http://pg-server.csc.ncsu.edu/mediawiki/index.php/Image:Negative_flow.png
- 12. QUESTIONS ??
- 13. References: ● https://www.owasp.org/index.php/Cross-Site_Request_Forgery_ %28CSRF%29_Prevention_Cheat_Sheet ● http://tournasdimitrios1.wordpress.com/2012/02/16/preventing- cross-site-request-forgeries-in-php/ ● http://pg- server.csc.ncsu.edu/mediawiki/index.php/CSC/ECE_517_Fall_2009 /wiki2_3_b5
- 14. THANK YOU