Bug 1764444 (CVE-2019-11763)

Summary:	CVE-2019-11763 Mozilla: Incorrect HTML parsing results in XSS bypass technique
Product:	[Other] Security Response	Reporter:	Doran Moppert <dmoppert>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED ERRATA	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	cschalle, gecko-bugs-nobody, jhorak, security-response-team, stransky
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
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.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2019-10-25 00:51:42 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	1763558, 1763559, 1763560, 1763561, 1763562, 1763563, 1764206, 1764937, 1764938, 1764939, 1764940, 1764941, 1764942
Bug Blocks:	1763556

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