Tuesday 25 September 2018

[XSS] survey.dropbox.com


survey.dropbox.com was pointing to mysurveylab.com and any mysurveylab.com's forms was accessible through survey.dropbox.com. This lead to stored xss at survey.dropbox.com because mysurveylab.com's forms were vulnerable to xss.

Impact: Nothing as far as I know. Except phishing!


Vulnerable section:

  • Reported: Jan 14th 2017
  • Closed as Informative: Jan 14th 2017
  • MySurveyLab fixed the bug within week(not sure).

Thursday 20 September 2018

DBID leakage through Dropbox Chooser


  • Chooser:
The Chooser is the fastest way to get files from Dropbox into your web app. It's a small JavaScript component that enables your app to get files from Dropbox without having to worry about the complexities of implementing a file browser, authentication, or managing uploads and storage. -Dropbox

  • DBID :

    DBID is a dropbox account id from which you can get the Account Owner Name and Email id attached to it through this endpoint.

How Chooser works:

  • A third party website embeds the chooser.
  • Then anyone visiting that website can share their files from Dropbox to that particular website.
  • You can try this at https://www.dropbox.com/developers/chooser.


As it can be seen, chooser was not only sharing the temporary download link to the third party but also DBID.


  • Reported: Jan 7th 2018
  • Triaged: Jan 9th 2018
  • Closed as resolved: Jan 20th 2018