Setting HttpOnly cookies would prevent cookies being stolen but if the XSS vulnerability exists it means that other vulnerabilities are likely such as the one described in your scenario.
#SESSION FIXATION ATTACK CODE#
This should stop JavaScript code from being entered as the protocol will be http/ https and not javascript in the cancel link: CancelĬancel URL will also have to be correctly HTML encoded to prevent break-out of the href attribute value context. check that it begins with or Anything that does not match should be rejected and an alert flagged to them. They should be validating that Cancel URL is a valid HTTP absolute URL. I would have thought if mtgox set their cookies to be http only then that would stop this from occurring? Perform any actions on behalf of his account - "Session riding". As soon as user signs in you can use fixated SID to Your server script should run cron task every 5 minutes, checking if SID is
Someday user logs in, and his session will stay the same SID. It's called Cookie tossing, and our cookie shadows original SESSION_IDīecause more specific Path-s are sent first.ĭokie="SESSION_ID=SID Domain=. Path=/code"
Get some guest SID with server side and fixate it using this XSS. User is supposed to wait 5 seconds until setTimeout in JS assigns location to our javascript: URL. MtGox has X-Frame-Options so it won't work in Put your payload in window.name and redirect to "=cancel" Name='okie="SESSION_ID=SID Domain=. Ĭreate Checkout button and set Cancel URL to javascript:eval(name)
I discovered session fixation leading to account takeover. I am trying to understand this session fixation attack that was described in theory against mtgox (a well known bitcoin exchange):
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