LinkedIn’s AutoFill Plugin Could Leak user Data, Secret Fix Failed (techcrunch.com)

TechCrunch reports of a flaw in LinkedIn’s AutoFill plugin that could have allowed hackers to steal your full name, phone number, email address, location (ZIP code), company, and job title. “Malicious sites have been able to invisibly render the plugin on their entire page so if users who are logged into LinkedIn click anywhere, they’d effectively be hitting a hidden ‘AutoFill with LinkedIn’ button and giving up their data.” From the report: Researcher Jack Cable discovered the issue on April 9th, 2018 and immediately disclosed it to LinkedIn. The company issued a fix on April 10th but didn’t inform the public of the issue. Cable quickly informed LinkedIn that its fix, which restricted the use of its AutoFill feature to whitelisted sites who pay LinkedIn to host their ads, still left it open to abuse. If any of those sites have cross-site scripting vulnerabilities, which Cable confirmed some do, hackers can still run AutoFill on their sites by installing an iframe to the vulnerable whitelisted site. He got no response from LinkedIn over the last 9 days so Cable reached out to TechCrunch. A LinkedIn spokesperson issued this statement to TechCrunch: “We immediately prevented unauthorized use of this feature, once we were made aware of the issue. We are now pushing another fix that will address potential additional abuse cases and it will be in place shortly. While we’ve seen no signs of abuse, we’re constantly working to ensure our members’ data stays protected. We appreciate the researcher responsibly reporting this and our security team will continue to stay in touch with them. For clarity, LinkedIn AutoFill is not broadly available and only works on whitelisted domains for approved advertisers. It allows visitors to a website to choose to pre-populate a form with information from their LinkedIn profile.”

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