exploit the possibilities

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
MD5 | 868ccacf1a79234f0073d4e84c526158

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

Login or Register to add favorites

File Archive:

August 2020

  • Su
  • Mo
  • Tu
  • We
  • Th
  • Fr
  • Sa
  • 1
    Aug 1st
    3 Files
  • 2
    Aug 2nd
    2 Files
  • 3
    Aug 3rd
    32 Files
  • 4
    Aug 4th
    0 Files
  • 5
    Aug 5th
    0 Files
  • 6
    Aug 6th
    0 Files
  • 7
    Aug 7th
    0 Files
  • 8
    Aug 8th
    0 Files
  • 9
    Aug 9th
    0 Files
  • 10
    Aug 10th
    0 Files
  • 11
    Aug 11th
    0 Files
  • 12
    Aug 12th
    0 Files
  • 13
    Aug 13th
    0 Files
  • 14
    Aug 14th
    0 Files
  • 15
    Aug 15th
    0 Files
  • 16
    Aug 16th
    0 Files
  • 17
    Aug 17th
    0 Files
  • 18
    Aug 18th
    0 Files
  • 19
    Aug 19th
    0 Files
  • 20
    Aug 20th
    0 Files
  • 21
    Aug 21st
    0 Files
  • 22
    Aug 22nd
    0 Files
  • 23
    Aug 23rd
    0 Files
  • 24
    Aug 24th
    0 Files
  • 25
    Aug 25th
    0 Files
  • 26
    Aug 26th
    0 Files
  • 27
    Aug 27th
    0 Files
  • 28
    Aug 28th
    0 Files
  • 29
    Aug 29th
    0 Files
  • 30
    Aug 30th
    0 Files
  • 31
    Aug 31st
    0 Files

Top Authors In Last 30 Days

File Tags

Systems

packet storm

© 2020 Packet Storm. All rights reserved.

Services
Security Services
Hosting By
Rokasec
close