![]() Disable all four options and check the results. On Safari, navigate to Preferences, select AutoFill, and go to AutoFill settings. Restart your browser, launch LastPass and check if you notice any improvements.Toggle off Offer to save passwords and Auto Sign-in.Then click on Autofill and select Passwords.So, disable this option and check the results. If your browser’s autofill feature is enabled, it could block LastPass from auto-filling your login information. If you use Safari, navigate to Preferences, click Extensions and untick the checkboxes corresponding to your extensions. Then select Extensions and switch all of them off. If you use Google Chrome or another Chromium-based browser, click the menu and go to More tools. One quick way to test this hypothesis is to disable all your extensions and check if the autofill option works. Adblockers and privacy extensions are known to block the scripts of the websites you’re visiting, as well as interfere with other extensions. If you use any browser extensions, some might interfere with LastPass blocking the tool’s autofill feature. If the tool is not auto-filling your login information for specific websites, remove the webpages from the Never URLs list. LastPass has a nifty feature called Never URLs that allows you to disable the password manager for specific websites. Make sure to enable Automatically fill login information.Next, navigate to Account Options and select Extension Preferences.Select General and turn on the Automatically fill login information option.Locate LastPass, click on More, and select Options.Click the Extensions icon in your browser.Fix LastPass Autofill Not Working on Windows 10 and Mac Check Autofill Settingsįirst of all, make sure you enabled the autofill option. Install the latest LastPass version and check the results. If the webpage you’re visiting is built on either of these platforms, autofill won’t work.Īnother reason why LastPass autofill won’t work is that you’re using an outdated app or extension version. It is also worth mentioning that LastPass does not support Flash-based or Silverlight-based websites. But you can always manually enter the login data on HTTP webpages. If the website you’re visiting is not secure, LastPass won’t trigger the autofill function. ![]() ![]() Update #2 2016.07.28: Lastpass have made a comment regarding Mathias finding on their blog.By design, Autofill via LastPass doesn’t work on HTTP webpages for obvious security reasons. At the time Mathias submitted this they didn’t have a bug bounty so he was more than satisfied with $1,000. Update #1 2016.07.28: There has been a lot of comments regarding the reward Mathias received from Lastpass. They are still much better than the alternative (password reuse).Īlthough, taking a second to disable autofill functionality is a good move because this isn’t the first autofill bug we’ve seen, and I doubt it will be the last.Īlso, this would not work if multi factor authentication was on, so you should probably enable that as well. Should we stop using password managers? No. The fix was pushed in less than a day(!), and they even awarded me with a bug bounty of $1,000. I reported this to LastPass through their responsible disclosure page and the report was handled very professionally. After that I could simply go through other commonly used sites and extract credentials for those too. Too bad to be true?īelow you see that the extension would fill my form with the stored credentials for. Since the code only URL encodes the last occurence of the actual domain is treated as the username portion of the URL. Var fixedURL = & (url = url.substring(0, fixedURL.length) + "%40")) īy browsing this URL: the browser would treat the current domain as while the extension would treat it as. This was the code (lpParseUri function, un-minified): However, the URL parsing code was flawed (bug in URL parsing? shocker!). First, the code parsed the URL to figure out which domain the browser was currently at, then it filled any login forms with the stored credentials. The bug that allowed me to extract passwords was found in the autofill functionality. A few cups of coffee later, I found something that looked really, really bad. I started by noticing that the extension added some HTML code to every page I visited, so I decided to dig into how that worked. Sounds too bad to be true? That’s what I thought too before I decided to check out the security of the LastPass browser extension.įor those who don’t know, LastPass is one of the world’s most popular password managers. Stealing all your passwords by just visiting a webpage. Note: This issue has already been resolved and pushed to the Lastpass users.
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