Cross Site Request Forgery Vulnerabilities

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The document summarizes a meeting agenda about cross-site request forgery (CSRF). The agenda includes discussing CSRF's placement in the OWASP Top 10, describing the CSRF threat and impact, explaining how CSRF works, providing a threat scenario example, discussing CSRF attack vectors, and covering CSRF countermeasures and testing methods.

Cross Site Request Forgery Deep Dive In Cincinnati Chapter Meeting May 27 th , 2008 [email_address]

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Place of CSRF in the OWASP Top 10 2007 ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Description of CSRF threat and the impact ,[object Object],[object Object]

CSRF is a Same Origin Exploit ,[object Object],[object Object],[object Object],[object Object]

CSRF Countermeasures: Client/User ,[object Object],[object Object],[object Object],[object Object],[object Object]

CSRF Countermeasures: Developers ,[object Object],[object Object],[object Object],[object Object]

Black Box testing and example ,[object Object],[object Object],[object Object],[object Object],[object Object]

Gray Box testing and example ,[object Object],[object Object]

Key Points What is Cross Site Request Forgery (CSRF)? How Attack Can Happen? Damages caused by CSRF? Mitigations 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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A common solution to the issue of CSRF vulnerability is to restrict malicious requests from reaching the core of the application, where all the data and business logic is present. But the most challenging part is to identify when a request is malicious and when is it healthy. Implementing a simple solution would lead to more vulnerabilities and implementing too strict a solution would lead to breakages where projects depend on cross site requests like third party authentication and payment gateways etc. The solution being proposed in this paper constitutes the design and implementation of a request filtering mechanism that can precisely distinguish between malicious and healthy requests, and automatically decide to restrict them or allow them to get further deep into the system. This paper briefly explains what a Cross Site Request Forgery attack is, and then goes into a step by step explanation on the prevention of CSRF attacks using a middleware. The proposed system is very strict in filtering out HTTP requests but also has an option to exempt certain cross site requests based on their domain or URL, with which payment hooks and other third party authentication calls can be exempted from the CSRF middleware. Shubham Kumar Jha | Raghavendra R "CSRF Attacks and its Defence using Middleware" Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-5 | Issue-4 , June 2021, URL: https://www.ijtsrd.compapers/ijtsrd42476.pdf Paper URL: https://www.ijtsrd.comcomputer-science/world-wide-web/42476/csrf-attacks-and-its-defence-using-middleware/shubham-kumar-jha

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