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LastPass Credential Leak From Previous Site

LastPass Credential Leak From Previous Site
Posted Sep 16, 2019
Authored by Tavis Ormandy, Google Security Research

LastPass suffers from an issue where bypassing do_popupregister() leaks credentials from the previous site.

tags | exploit
SHA-256 | e91aef0b7b7de488bc6fb1b7167218cb57d0484b98f8e1376f39b3cadbd7f574

LastPass Credential Leak From Previous Site

Change Mirror Download
lastpass: bypassing do_popupregister() leaks credentials from previous site

I noticed that you can create a popup without calling do_popupregister() by iframing popupfilltab.html (i.e. via moz-extension, ms-browser-extension, chrome-extension, etc). It's a valid web_accessible_resource.

Because do_popupregister() is never called, ftd_get_frameparenturl() just uses the last cached value in g_popup_url_by_tabid for the current tab. That means via some clickjacking, you can leak the credentials for the previous site logged in for the current tab.

I don't consider this a *critical* issue, because I don't think there's a way to control which site you leak credentials from (just the last visited site), but it does seem serious enough to fix.

To reproduce the issue:

1. Go to a site you have credentials saved for and click the little \"...\" icon.
2. Go to https://example.com
3. Enter this in the console:

y = document.createElement(\"iframe\");
y.height = 1024;
y.width = \"100%\";
y.src=\"chrome-extension://hdokiejnpimakedhajhdlcegeplioahd/popupfilltab.html\";
// or y.src=\"moz-extension://...\";
// or y.src=\"ms-browser-extension://...\";
document.body.appendChild(y);


This bug is subject to a 90 day disclosure deadline. After 90 days elapse
or a patch has been made broadly available (whichever is earlier), the bug
report will become visible to the public.





Found by: taviso@google.com

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