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Cross-site request forgery, also known as a one-click attack or session riding and abbreviated as CSRF (sometimes pronounced sea-surf) or XSRF, is a type of malicious exploit of a website whereby unauthorized commands are transmitted from a user that the website trusts. Unlike cross-site scripting (XSS), which exploits the trust a user has for a particular site, CSRF exploits the trust that a site has in a user's browser.
CSRF vulnerabilities have been known and in some cases exploited since 2001. Because it is carried out from the user's IP address, some website logs might not have evidence of CSRF. Exploits are under-reported, at least publicly, and as of 2007 there are few well-documented examples. About 18 million users of eBay's Internet Auction Co. at Auction.co.kr in Korea lost personal information in February 2008 . Customers of a bank in Mexico were attacked in early 2008 with an image tag in email. The link in the image tag changed the DNS entry for the bank in their ADSL router to point to a malicious website impersonating the bank.
The attack works by including a link or script in a page that accesses a site to which the user is known (or is supposed) to have been authenticated. For example, one user, Bob, might be browsing a chat forum where another user, Fred, has posted a message. Suppose that Fred has crafted an HTML image element that references an action on Bob's bank's website (rather than an image file), e.g.,
If Bob's bank keeps his authentication information in a cookie, and if the cookie hasn't expired, then the attempt by Bob's browser to load the image will submit the withdrawal form with his cookie, thus authorizing a transaction without Bob's approval.
A cross-site request forgery is a confused deputy attack against a Web browser. The deputy in the bank example is Bob's Web browser which is confused into misusing Bob's authority at Fred's direction.
The following characteristics are common to CSRF:
At risk are web applications that perform actions based on input from trusted and authenticated users without requiring the user to authorize the specific action. A user who is authenticated by a cookie saved in the user's web browser could unknowingly send an HTTP request to a site that trusts the user and thereby causes an unwanted action.
CSRF attacks are often exploited in pair with XSS attacks, making CSRF vulnerabilities much more dangerous. Existence of an XSS vulnerability quite often allows to bypass the majority of existent anti-CSRF mechanisms. Such examples are described in details in "XSS & CSRF: Practical exploitation of post-authentication vulnerabilities in web applications" publication. 
Several things have to happen for cross-site request forgery to succeed:
Given these constraints, an attacker might have difficulty finding logged-in victims or attackable form submissions. On the other hand, attack attempts are easy to mount and invisible to victims, and application designers are less familiar with and prepared for CSRF attacks than they are for, say, password-guessing dictionary attacks.
According to the United States Department Of Homeland Security the most dangerous CSRF vulnerability ranks in at the 909th most dangerous software bug ever found, making this vulnerability more dangerous than most buffer overflows. Other severity metrics have been issued for CSRF vulnerabilities that result in remote code execution with root privileges as well as a vulnerability that can compromise a root certificate, which will completely undermine a public key infrastructure.
An attacker may forge a request to log the victim in to a target website using the attacker's credentials; this is known as login CSRF. Login CSRF makes various novel attacks possible; for instance, an attacker can later log in to the site with his legitimate credentials and view private information like activity history that has been saved in the account. The attack has been demonstrated against YouTube.
Additionally, while typically described as a static type of attack, CSRF can also be dynamically constructed as part of a payload for a cross-site scripting attack, as demonstrated by the Samy worm, or constructed on the fly from session information leaked via offsite content and sent to a target as a malicious URL. CSRF tokens could also be sent to a client by an attacker due to session fixation or other vulnerabilities, or guessed via a brute-force attack, rendered on a malicious page that generates thousands of failed requests. The attack class of "Dynamic CSRF", or using a per-client payload for session-specific forgery, was described in 2009 by Nathan Hamiel and Shawn Moyer at the BlackHat Briefings, though the taxonomy has yet to gain wider adoption.
A new vector for composing dynamic CSRF attacks was presented by Oren Ofer at a local OWASP chapter meeting on January 2012 - "AJAX Hammer - Dynamic CSRF".
Individual Web users using unmodified versions of the most popular browsers can do relatively little to prevent cross-site request forgery. Logging out of sites and avoiding their "remember me" features can mitigate CSRF risk; not displaying external images or not clicking links in spam or untrusted e-mails may also help.
Browser extensions such as RequestPolicy (for Mozilla Firefox) can prevent CSRF by providing a default-deny policy for cross-site requests. However, this can significantly interfere with the normal operation of many websites. The CsFire extension (also for Firefox) can mitigate the impact of CSRF with less impact on normal browsing, by removing authentication information from cross-site requests.
Web sites have various CSRF countermeasures available:
Refererheader or(and) Checking the HTTP
An easy and effective solution is to use a CSRF filter such as OWASP's CSRFGuard. The filter intercepts responses, detects if it is a html document and inserts a token in to the forms and optionally inserts script to insert tokens in ajax functions. The filter also intercepts requests to check that the token is present.
Checking the HTTP
Referer header to see if the request is coming from an authorized page is commonly used for embedded network devices because it does not increase memory requirements. However a request that omits the
Referer header must be treated as unauthorized because an attacker can suppress the
Referer header by issuing requests from FTP or HTTPS URLs. This strict
Referer validation may cause issues with browsers or proxies that omit the
Referer header for privacy reasons. Also, old versions of Flash (before 9.0.18) allow malicious Flash to generate GET or POST requests with arbitrary http request headers using CRLF Injection. Similar CRLF injection vulnerabilities in a client can be used to spoof the referrer of an http request.
To prevent forgery of login requests, sites can use these CSRF countermeasures in the login process, even before the user is logged in.
Sites with especially strict security needs, like banks, often log users off after (for example) 15 minutes of inactivity.
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