[CSP] Unsafe-inline and nonce deployment

This is the second of four posts on our experience deploying Content Security Policy at Dropbox. If this sort of work interests you, we are hiring! We will also be at AppSec USA this week. Come say hi!

In the previous post, we discussed how to filter reports and deploy content source whitelists using CSP for the website. Typically, the most important content sources to whitelist are the source of your code, as defined by the script-src (and the object-src directive). A standard content-security-policy deployment will typically include a list of allowed domains like the main website and trusted CDNs in script-src as well as directives like 'unsafe-inline' and 'unsafe-eval'.

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[CSP] On Reporting and Filtering

This is the first of four posts on our experience deploying Content Security Policy at Dropbox. If this sort of work interests you, we are hiring! We will also be at AppSec USA this week. Come say hi!

At Dropbox, we are big fans of Content Security Policy or CSP. For those not familiar with the specification, I recommend reading Mike West’s excellent introduction to CSP. A quick recap: at its core, CSP is a declarative mechanism to whitelist content sources (such as sources for scripts,

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Dropbox Bug Bounty Program: Best Practices

Dropbox is recognizing security researchers for submitting security bugs through a bug bounty program with HackerOne and Bugcrowd. Whether you’re a security bug guru or a complete newbie, we want to make it as easy as possible to submit any bugs you find!

To this end, we’ve compiled the top 5 security bug report tips from our very own Security Engineers:

  1. Build a stronger report by including information on the actual and potential impact of the vulnerability, as well as details of how it could be exploited.
  2. Include the methodology you used to find the bug,

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Introducing the Dropbox bug bounty program

Protecting the privacy and security of our users’ information is a top priority for us at Dropbox. In addition to hiring world class experts, we believe it’s important to get all the help we can from the security research community, too. That’s why we’re excited to announce that starting today, we’ll be recognizing security researchers for their effort through a bug bounty program with HackerOne.

Bug bounties (or vulnerability rewards programs) are used by many leading companies to improve the security of their products. These programs provide an incentive for researchers to responsibly disclose software bugs,

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