Mark Thomas wrote:
On 16/11/2012 16:12, André Warnier wrote:
Mark Thomas wrote:
On 16/11/2012 10:01, André Warnier wrote:
Vijaya Kumar wrote:
Hi, I work on a web application that is vulnerable to CSRF(Cross Site
Request Forgery) attack. Tomcat 7 has a CSRF prevention filter. I went
through the description to configure this filter. This filter expects
that we call HttpServletResponse#encodeRedirectURL(String) or
HttpServletResponse#encodeURL(String). I see that in my application we
don't use the above mentioned methods. Can you please let me know
whether there is any other way of using this filter without making
calls to encodeURL() or encodeRedirectURL()?
To be precise, I am looking for a way to incorporate CSRF Filter in an
already existing application that doesn't use
HttpServletResponse#encodeRedirectURL(String) or
HttpServletResponse#encodeURL(String).
Any help in this regard is appreciated.
Hi.
I am a bit of a novice in this area, but as far as I understand what a
CSRF attack is
(http://en.wikipedia.org/wiki/Cross-site_request_forgery), and what this
filter does, it seems to me at least that if your are not using
HttpServletResponse#encodeRedirectURL(String) or
HttpServletResponse#encodeURL(String) in your application, then this
filter would be unnecessary, and would not help anyway.
Wrong.
In order for the CSRF prevention filter to work, an application must run
all URLs through encodeRedirectURL() or encodeURL(). If applications
don't do this, the filter can't add the nonce to the URL that is used to
provide the CSRF protection.
Well, that's essentially what I was saying. Or am I missing something
here ?
Your statement that "if you are not using encodeRedirectURL() or
encodeURL() in your application, then this filter would be unnecessary"
is wrong. It implies that if you are not using those methods then you
will not be at risk of a CSRF attack.
We're getting into semantics here. :-)
I posit that I never implied what you say here.
Let's ask the question another way : if the OP is not using encodeRedirectURL() or
encodeURL() in his application, does the CSRF prevention filter help in any way to prevent
CSRF attacks on his application ?
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