Your mobile password manager might be exposing your credentials because of Webview

A number of popular mobile password managers are inadvertently spilling user credentials due to a vulnerability in the autofill functionality of Android apps.

The vulnerability, dubbed “AutoSpill,” can expose users’ saved credentials from mobile password managers by circumventing Android’s secure autofill mechanism, according to university researchers at the IIIT Hyderabad, who discovered the vulnerability and presented their research at Black Hat Europe this week.

The researchers, Ankit Gangwal, Shubham Singh and Abhijeet Srivastava, found that when an Android app loads a login page in WebView, password managers can get “disoriented” about where they should target the user’s login information and instead expose their credentials to the underlying app’s native fields, they said. This is because WebView, the preinstalled engine from Google, lets developers display web content in-app without launching a web browser, and an autofill request is generated.


“When the password manager is invoked to autofill the credentials, ideally, it should autofill only into the Google or Facebook page that has been loaded. But we found that the autofill operation could accidentally expose the credentials to the base app.”

Gangwal notes that the ramifications of this vulnerability, particularly in a scenario where the base app is malicious, are significant. He added: “Even without phishing, any malicious app that asks you to log in via another site, like Google or Facebook, can automatically access sensitive information.”

The researchers tested the AutoSpill vulnerability using some of the most popular password managers, including 1Password, LastPass, Keeper and Enpass, on new and up-to-date Android devices. They found that most apps were vulnerable to credential leakage, even with JavaScript injection disabled. When JavaScript injection was enabled, all the password managers were susceptible to their AutoSpill vulnerability.


Source: Your mobile password manager might be exposing your credentials | TechCrunch

It’s pretty well known that you shouldn’t use in app browsers anyway though PSA: Stop Using In-App Browsers Now but I am not sure how you would avoid using webview in this case

Robin Edgar

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