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[Bug] Potential origin spoofing because address bar truncates "facebook.com.evil.com" to "facebook.com..." instead of "...evil.com"

See original GitHub issue

Steps to reproduce

Open http://facebook.com.facebook.com.evil.com/
Look at the portion of the URL visible in the address bar.

I originally filed this bug against desktop Firefox. On desktop, Firefox, Chrome, Edge, and Safari all do the wrong thing (show “facebook.com”):

https://bugzilla.mozilla.org/show_bug.cgi?id=1598175

Expected behavior

The URL standard says:

When the full host cannot be rendered, browsers should elide domain labels starting from the lowest-level domain label. For example, examplecorp.com.evil.com should be elided as ...com.evil.com, not examplecorp.com…`.

Fennec and Chrome on Android do the right thing: they show ...ook.com.facebook.com.evil.com and facebook.com.evil.com, respectively.

Actual behavior

Fenix shows http://facebook.com.facebook... without showing evil.com.

Device information

Android device: Moto G5
Fenix version: 2.3.0

┆Issue is synchronized with this Jira Task

Issue Analytics

State:
Created 4 years ago
Reactions:4
Comments:12 (6 by maintainers)

Top GitHub Comments

2reactions

Mugurellcommented, Jan 11, 2021

Opera resolves this interestingly. The domain is shown but the subdomains and pages are elided.

0reactions

stale[bot]commented, Nov 19, 2022

See: https://github.com/mozilla-mobile/fenix/issues/17373 This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.