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Issue metadata

Status: Verified
Closed: Feb 2018
EstimatedDays: ----
NextAction: ----
OS: Linux , Android , Windows , iOS , Chrome , Mac , Fuchsia
Pri: 1
Type: Bug-Security

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Security: Whole-script confusable domain label spoofing (Cyrillic)

Reported by, Feb 20 2018

Issue description

Chrome Version: 66.0.3350.0 (Official Build) canary (64-bit)
Operating System: All

REPRODUCTION CASE is shown https://шӊатѕарр.com

Note: This is similar to  issue 793628 .
Components: UI>Security>UrlFormatting UI>Internationalization
Is this a top-10K site?
I think so, since is shown as expected.

Comment 3 by, Feb 20 2018

Labels: Security_Severity-Medium Security_Impact-Stable OS-Android OS-Chrome OS-Fuchsia OS-iOS OS-Linux OS-Mac OS-Windows
Status: Assigned (was: Unconfirmed)

Comment 4 by, Feb 20 2018

Status: Started (was: Assigned)
Thanks for the report. 

U+04CA (ӊ) was missed in  bug 793628  because it didn't look like capital H with a font (Symbola ) that happenen to render the character in for the following set. (the Unicode util page specifies a bunch of fonts and the first one covering U+04CA was 'symbola' with a rather unusual shape for U+04CA). 

[:IdentifierStatus=Allowed:] &  [:Ll:] &
  [[:sc=Cyrillic:] -
  [\ua640-\ua69f][\ua720-\ua7ff]]] &
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Comment 5 by, Feb 21 2018

Labels: M-65
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Comment 6 by, Feb 21 2018

Labels: Pri-1
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Comment 7 by, Feb 21 2018

The following revision refers to this bug:

commit d52b8375cfe5b56194d3df09c18e7b64e5838369
Author: Jungshik Shin <>
Date: Wed Feb 21 18:40:39 2018

Add a few more entries to the confusables list for IDN

U+04CA (ӊ) => h
U+0E1F (ฟ) => w
U+0E23 (ร) => s

Bug: 813925,  813814 
Test: components_unittests --gtest_filter=*IDN*
Change-Id: If81ea9bf1c1729f1b6ffc71d718dc5950ac825b5
Reviewed-by: Peter Kasting <>
Commit-Queue: Jungshik Shin <>
Cr-Commit-Position: refs/heads/master@{#538159}

Comment 8 by, Feb 22 2018

Status: Fixed (was: Started)
Project Member

Comment 9 by, Feb 24 2018

Labels: -Restrict-View-SecurityTeam Restrict-View-SecurityNotify
Labels: reward-topanel
Labels: -M-65 M-66
Labels: -reward-topanel reward-unpaid reward-500
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Please do NOT publicly disclose details until a fix has been released to all our users. Early public disclosure may cancel the provisional reward. Also, please be considerate about disclosure when the bug affects a core library that may be used by other products. Please do NOT share this information with third parties who are not directly involved in fixing the bug. Doing so may cancel the provisional reward. Please be honest if you have already disclosed anything publicly or to third parties. Lastly, we understand that some of you are not interested in money. We offer the option to donate your reward to an eligible charity. If you prefer this option, let us know and we will also match your donation - subject to our discretion. Any rewards that are unclaimed after 12 months will be donated to a charity of our choosing.
Thanks! $500 for this.
Labels: -reward-unpaid reward-inprocess
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Comment 15 by, Mar 16

Labels: Merge-Request-66
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Comment 16 by, Mar 16

Labels: -Merge-Request-66 Merge-Review-66 Hotlist-Merge-Review
This bug requires manual review: Less than 28 days to go before AppStore submit on M66
Please contact the milestone owner if you have questions.
Owners: cmasso@(Android), cmasso@(iOS), josafat@(ChromeOS), abdulsyed@(Desktop)

For more details visit - Your friendly Sheriffbot
Please verify the fix in the latest canary
verified on canary 67.0.3375.0,  https://шӊатѕарр.comis is shown in punycode as expected. 
Screen Shot 2018-03-19 at 17.01.08.png
33.8 KB View Download
Labels: -Hotlist-Merge-Review -Merge-Review-66 Merge-Approved-66
Status: Verified (was: Fixed)
The CL for this bug was landed on Feb 21 (a week before 66 branch). See comment 7. 

Labels: -Merge-Approved-66
Labels: Release-0-M66
Labels: CVE-2018-6102
Labels: CVE_description-missing
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Comment 25 by, Jun 1

Labels: -Restrict-View-SecurityNotify allpublic
This bug has been closed for more than 14 weeks. Removing security view restrictions.

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