Bug 1764444 (CVE-2019-11763) - CVE-2019-11763 Mozilla: Incorrect HTML parsing results in XSS bypass technique
Summary: CVE-2019-11763 Mozilla: Incorrect HTML parsing results in XSS bypass technique
Keywords:
Status: CLOSED ERRATA
Alias: CVE-2019-11763
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 1763558 1763559 1763560 1763561 1763562 1763563 1764206 1764937 1764938 1764939 1764940 1764941 1764942
Blocks: 1763556
TreeView+ depends on / blocked
 
Reported: 2019-10-23 05:40 UTC by Doran Moppert
Modified: 2021-02-16 21:12 UTC (History)
5 users (show)

Fixed In Version: firefox 68.2, thunderbird 68.2
Doc Type: If docs needed, set a value
Doc Text:
A flaw was found in Mozilla Firefox and Thunderbird where null bytes were incorrectly parsed in HTML entities. This could lead to HTML comments being treated as code which could lead to XSS in a web application or HTML entities being masked from filters.
Clone Of:
Environment:
Last Closed: 2019-10-25 00:51:42 UTC
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2019:3193 0 None None None 2019-10-23 14:00:49 UTC
Red Hat Product Errata RHSA-2019:3196 0 None None None 2019-10-24 08:24:51 UTC
Red Hat Product Errata RHSA-2019:3210 0 None None None 2019-10-29 09:49:14 UTC
Red Hat Product Errata RHSA-2019:3237 0 None None None 2019-10-29 13:47:06 UTC
Red Hat Product Errata RHSA-2019:3281 0 None None None 2019-10-31 14:08:21 UTC
Red Hat Product Errata RHSA-2019:3756 0 None None None 2019-11-06 17:08:40 UTC

Description Doran Moppert 2019-10-23 05:40:35 UTC 
Failure to correctly handle null bytes when processing HTML entities resulted in Firefox incorrectly parsing these entities. This could have led to HTML comment text being treated as HTML which could have led to XSS in a web application under certain conditions. It could have also led to HTML entities being masked from filters - enabling the use of entities to mask the actual characters of interest from filters.



External Reference:

https://www.mozilla.org/en-US/security/advisories/mfsa2019-33/#CVE-2019-11763
Comment 1 Doran Moppert 2019-10-23 05:40:37 UTC 
Acknowledgments:

Name: the Mozilla project
Upstream: Gareth Heyes
Comment 2 errata-xmlrpc 2019-10-23 14:00:48 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2019:3193 https://access.redhat.com/errata/RHSA-2019:3193
Comment 3 errata-xmlrpc 2019-10-24 08:24:50 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2019:3196 https://access.redhat.com/errata/RHSA-2019:3196
Comment 4 Product Security DevOps Team 2019-10-25 00:51:42 UTC 
This bug is now closed. Further updates for individual products will be reflected on the CVE page(s):

https://access.redhat.com/security/cve/cve-2019-11763
Comment 5 errata-xmlrpc 2019-10-29 09:49:13 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2019:3210 https://access.redhat.com/errata/RHSA-2019:3210
Comment 6 errata-xmlrpc 2019-10-29 13:47:05 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2019:3237 https://access.redhat.com/errata/RHSA-2019:3237
Comment 7 errata-xmlrpc 2019-10-31 14:08:20 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 6

Via RHSA-2019:3281 https://access.redhat.com/errata/RHSA-2019:3281
Comment 8 errata-xmlrpc 2019-11-06 17:08:38 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 6

Via RHSA-2019:3756 https://access.redhat.com/errata/RHSA-2019:3756
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