It ensures that even if someone were to get a hold of your password, they would not be able to access your account. But there are things you can do to protect yourself from such things happening again before the next Cloudbleed-like incident happens. Fitbit, OKCupid and Medium are a few, but you can find out if websites you use rely on Cloudfare with this tool. The errors generated were fed to our global error logging infrastructure for analysis and trending.
Because of the seriousness of such a bug, a cross-functional team from software engineering, infosec and operations formed in San Francisco and London to fully understand the underlying cause, to understand the effect of the memory leakage, and to work with Google and other search engines to remove any cached HTTP responses. Our natural inclination was to get news of the bug out as quickly as possible, but we felt we had a duty of care to ensure that search engine caches were scrubbed before a public announcement. When the new parser is not present the final buffer that contains data looks like this: The Email Obfuscation feature had been changed on February 13 and was the primary cause of the leaked memory, thus disabling it quickly stopped almost all memory leaks. It is in Cloudflare's use of Ragel. We compiled this as a guide to Cloudbleed and how you should respond. To modify the page, we need to read and parse the HTML to find elements that need changing. As scary as any internet security breach seems, these were pretty different. In order for the memory to leak the following had to be true: Explainer Mobile Cloudbleed bug: This blog post is rather long but, as is our tradition, we prefer to be open and technically detailed about problems that occur with our service. However, the memory space being leaked did still contain sensitive information. It ensures that even if someone were to get a hold of your password, they would not be able to access your account. We also undertook other search expeditions looking for potentially leaked information on sites like Pastebin and did not find anything. We're talking full https requests, client IP addresses, full responses, cookies, passwords, keys, data, everything. But the worst of it is over, for now. About a year ago we decided that the Ragel-based parser had become too complex to maintain and we started to write a new parser, named cf-html, to replace it. At that point it was no longer possible for memory to be returned in an HTTP response. We first used this new parser for the Automatic HTTP Rewrites feature and have been slowly migrating functionality that uses the old Ragel parser to cf-html. One obvious piece of information that had leaked was a private key used to secure connections between Cloudflare machines. The infosec team worked to identify URIs in search engine caches that had leaked memory and get them purged. Within a few seconds, those features were disabled worldwide. Adding an fhold to the error handler fixes the problem. External impact and cache clearing More concerning was that fact that chunks of in-flight HTTP requests for Cloudflare customers were present in the dumped memory. With the help of Google, Yahoo, Bing and others, we found unique URIs that had been cached and which contained leaked memory. If there is an upside to this story, it's that Cloudflare stopped the bug within 44 minutes of finding out about it and fixed the problem completely within 7 hours. Another team built test cases from malformed web pages found in the wild.
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