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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Jules,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Could you make it so were only allowed 1 active upload stream as well? That way even if tried creating lots of extra files whilst a larger one was uploading
then it wouldn’t work as an exploit…<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Jason<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span lang="EN-US" style="font-size:10.0pt;font-family:"Tahoma","sans-serif";color:windowtext">From:</span></b><span lang="EN-US" style="font-size:10.0pt;font-family:"Tahoma","sans-serif";color:windowtext"> zendto-bounces@zend.to [mailto:zendto-bounces@zend.to]
<b>On Behalf Of </b>Jules<br>
<b>Sent:</b> 23 May 2011 09:53<br>
<b>To:</b> ZendTo Users<br>
<b>Subject:</b> [ZendTo] Re: Antwort: Re: Zendto is vulnerable for SQL-Injection<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><br>
<br>
On 22/05/2011 15:09, <a href="mailto:patrick.gaikowski@kaufland.com">patrick.gaikowski@kaufland.com</a> wrote:
<o:p></o:p></p>
<p><span style="font-size:10.0pt;font-family:"Arial","sans-serif"">Hi,</span><br>
<br>
<span style="font-size:10.0pt;font-family:"Arial","sans-serif"">we engaged a company for penetration testing of web applications and thats why i tried to be prepared....</span><br>
<br>
<span style="font-size:10.0pt;font-family:"Arial","sans-serif"">I used the tool "burp suite" which is a http/https proxy for intercepting web requests / responses.
</span><o:p></o:p></p>
<ul type="disc">
<li class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l3 level1 lfo1">
<span style="font-size:10.0pt;font-family:"Arial","sans-serif"">i made a dropoff request without username / password --> only ReCaptcha</span><o:p></o:p></li></ul>
<p class="MsoNormal">Definitely a bug, now fixed. Well done!<br>
<br>
<o:p></o:p></p>
<ul type="disc">
<li class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l2 level1 lfo2">
<o:p> </o:p></li><li class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l2 level1 lfo2">
<span style="font-size:10.0pt;font-family:"Arial","sans-serif"">i intercepted the POST to dropoff.php</span><o:p></o:p></li></ul>
<p class="MsoNormal"><br>
<i>(See attached file: dropoff)</i><o:p></o:p></p>
<p class="MsoNormal">Great, XML, my favourite. :-)<br>
<br>
<o:p></o:p></p>
<ul type="disc">
<li class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l1 level1 lfo3">
<span style="font-size:10.0pt;font-family:"Arial","sans-serif"">in the tool you can send the POST to the repeating module and modify the POST</span>
<o:p></o:p></li><li class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l1 level1 lfo3">
<span style="font-size:10.0pt;font-family:"Arial","sans-serif"">i was able the send the upload a various times --> the limit will be the free space on the host system --></span><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:red"> can be
used for blow up the system and perhaps crash the system</span><o:p></o:p></li></ul>
<p class="MsoNormal">If you don't complete the upload, then you will be able to do that. Once the upload has finished, the auth code should be removed (and now is! :-) (unless you're a logged in user, at which point we can hunt you down anyway).<br>
I'm not particularly worried about attacks by logged in users. They can just repeat the entire upload process as many times as they like anyway, uploading either the same files or different files each time.<br>
<br>
<o:p></o:p></p>
<ul type="disc">
<li class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l0 level1 lfo4">
<o:p> </o:p></li><li class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l0 level1 lfo4">
<span style="font-size:10.0pt;font-family:"Arial","sans-serif"">i was able to change for example the email-address of the recipient (only the domain defined in preferences.php) in the POST-->
</span><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:red">can be used for SPAM if the email domain is not configured correctly</span><o:p></o:p></li></ul>
<p class="MsoNormal">Agreed. You can indeed change the email address of the recipient in the upload. But then again you can just make your automated hacking system slightly more clever and do multiple uploads to anyone you like in the the preferences.php configured
domain. So I am not worried about that either.<br>
<br>
<o:p></o:p></p>
<p class="MsoNormal"><br>
<span style="font-size:10.0pt;font-family:"Arial","sans-serif"">Is it possible to limit the lifetime of the
</span><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:red">auth-Parameter</span><span style="font-size:10.0pt;font-family:"Arial","sans-serif""> to only one request?
</span><o:p></o:p></p>
<p class="MsoNormal">Well spotted, yes that is a bug. Fixed. That should take care of the multiple uploads exploits you found above too.<br>
<br>
Many thanks for finding these for me, it is much appreciated!<br>
<br>
Cheers,<br>
<br>
<o:p></o:p></p>
<pre>Jules<o:p></o:p></pre>
<pre><o:p> </o:p></pre>
<pre>-- <o:p></o:p></pre>
<pre>Julian Field MEng CITP CEng<o:p></o:p></pre>
<pre><a href="http://www.Zend.To">www.Zend.To</a><o:p></o:p></pre>
<pre><o:p> </o:p></pre>
<pre>Follow me at twitter.com/JulesFM<o:p></o:p></pre>
<pre>PGP footprint: EE81 D763 3DB0 0BFD E1DC 7222 11F6 5947 1415 B654<o:p></o:p></pre>
<pre><o:p> </o:p></pre>
<pre>'All programs have a desire to be useful' - Tron, 1982<o:p></o:p></pre>
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