How can CSRF been exploited if the content-type is not plain and the browser as the SOP policy
I have a GWT application. The HTTP request is always a POST, and on server side GET methods throw an exception (method not supported). The header on the POST request contains, among other stuff:
Content-Type: text/x-gwt-rpc; charset=UTF-8
X-GWT-Module-Base: xxxxx
X-GWT-Permutation: xxxxxx
Could someone explain me how can someone exploit a CSRF here? Wouldn't the attacker be forging an malicious HTML like this ?
var xhr = new XMLHttpRequest();
xhr.open("POST", 'URL', true);
xhr.setRequestHeader('Content-type', 'text/x-gwt-rpc; charset=utf-8');
xhr.setRequestHeader('X-GWT-Permutation', 'XXXXXX');
xhr.setRequestHeader('X-GWT-Module-Base','XXXXXX');
xhr.send(data);
In that case wherever this page is hosted, since the content-type is not plain or simple, it will produce a cross origin call and the browser (any browser now) will issue an OPTION pre flight request in which case will fail because my app doesn't respond to OPTION and doesn't return Access-Control-Allow-Origin to random websites.
Even we the above protection, how can an attacker find is way around the browser OPTION pre-flight ? Can it be bypassed somehow?
gwt csrf option
asked Nov 13 '18 at 11:05
MarcoMarco
867
add a comment |
I have a GWT application. The HTTP request is always a POST, and on server side GET methods throw an exception (method not supported). The header on the POST request contains, among other stuff:
Content-Type: text/x-gwt-rpc; charset=UTF-8
X-GWT-Module-Base: xxxxx
X-GWT-Permutation: xxxxxx
Could someone explain me how can someone exploit a CSRF here? Wouldn't the attacker be forging an malicious HTML like this ?
var xhr = new XMLHttpRequest();
xhr.open("POST", 'URL', true);
xhr.setRequestHeader('Content-type', 'text/x-gwt-rpc; charset=utf-8');
xhr.setRequestHeader('X-GWT-Permutation', 'XXXXXX');
xhr.setRequestHeader('X-GWT-Module-Base','XXXXXX');
xhr.send(data);
In that case wherever this page is hosted, since the content-type is not plain or simple, it will produce a cross origin call and the browser (any browser now) will issue an OPTION pre flight request in which case will fail because my app doesn't respond to OPTION and doesn't return Access-Control-Allow-Origin to random websites.
Even we the above protection, how can an attacker find is way around the browser OPTION pre-flight ? Can it be bypassed somehow?
gwt csrf option
asked Nov 13 '18 at 11:05
MarcoMarco
867
You can also ask GWT questions from GWT developers here: gitter.im/gwtproject/gwt
– xybrek
Nov 13 '18 at 23:16
add a comment |
I have a GWT application. The HTTP request is always a POST, and on server side GET methods throw an exception (method not supported). The header on the POST request contains, among other stuff:
Content-Type: text/x-gwt-rpc; charset=UTF-8
X-GWT-Module-Base: xxxxx
X-GWT-Permutation: xxxxxx
Could someone explain me how can someone exploit a CSRF here? Wouldn't the attacker be forging an malicious HTML like this ?
var xhr = new XMLHttpRequest();
xhr.open("POST", 'URL', true);
xhr.setRequestHeader('Content-type', 'text/x-gwt-rpc; charset=utf-8');
xhr.setRequestHeader('X-GWT-Permutation', 'XXXXXX');
xhr.setRequestHeader('X-GWT-Module-Base','XXXXXX');
xhr.send(data);
In that case wherever this page is hosted, since the content-type is not plain or simple, it will produce a cross origin call and the browser (any browser now) will issue an OPTION pre flight request in which case will fail because my app doesn't respond to OPTION and doesn't return Access-Control-Allow-Origin to random websites.
Even we the above protection, how can an attacker find is way around the browser OPTION pre-flight ? Can it be bypassed somehow?
gwt csrf option
asked Nov 13 '18 at 11:05
MarcoMarco
867
I have a GWT application. The HTTP request is always a POST, and on server side GET methods throw an exception (method not supported). The header on the POST request contains, among other stuff:
Content-Type: text/x-gwt-rpc; charset=UTF-8
X-GWT-Module-Base: xxxxx
X-GWT-Permutation: xxxxxx
Could someone explain me how can someone exploit a CSRF here? Wouldn't the attacker be forging an malicious HTML like this ?
var xhr = new XMLHttpRequest();
xhr.open("POST", 'URL', true);
xhr.setRequestHeader('Content-type', 'text/x-gwt-rpc; charset=utf-8');
xhr.setRequestHeader('X-GWT-Permutation', 'XXXXXX');
xhr.setRequestHeader('X-GWT-Module-Base','XXXXXX');
xhr.send(data);
In that case wherever this page is hosted, since the content-type is not plain or simple, it will produce a cross origin call and the browser (any browser now) will issue an OPTION pre flight request in which case will fail because my app doesn't respond to OPTION and doesn't return Access-Control-Allow-Origin to random websites.
Even we the above protection, how can an attacker find is way around the browser OPTION pre-flight ? Can it be bypassed somehow?
gwt csrf option
gwt csrf option
asked Nov 13 '18 at 11:05
MarcoMarco
867
asked Nov 13 '18 at 11:05
MarcoMarco
867
asked Nov 13 '18 at 11:05
MarcoMarco
867
asked Nov 13 '18 at 11:05
MarcoMarco
867
asked Nov 13 '18 at 11:05
MarcoMarco
867
867
You can also ask GWT questions from GWT developers here: gitter.im/gwtproject/gwt
– xybrek
Nov 13 '18 at 23:16
add a comment |
You can also ask GWT questions from GWT developers here: gitter.im/gwtproject/gwt
– xybrek
Nov 13 '18 at 23:16
You can also ask GWT questions from GWT developers here: gitter.im/gwtproject/gwt
– xybrek
Nov 13 '18 at 23:16
You can also ask GWT questions from GWT developers here: gitter.im/gwtproject/gwt
– xybrek
Nov 13 '18 at 23:16
add a comment |
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You can also ask GWT questions from GWT developers here: gitter.im/gwtproject/gwt
– xybrek
Nov 13 '18 at 23:16