Bug 1361978 – CVE-2016-5251 Mozilla: Location bar spoofing via data URLs with malformed/invalid mediatypes (MFSA 2016-66)

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Bug 1361978 - (CVE-2016-5251) CVE-2016-5251 Mozilla: Location bar spoofing via data URLs with malformed/invalid mediatypes (MFSA 2016-66)

Summary:	CVE-2016-5251 Mozilla: Location bar spoofing via data URLs with malformed/inv...

Status:	CLOSED NOTABUG

Aliases:	CVE-2016-5251

Product:	Security Response
Classification:	Other
Component:	vulnerability (Show other bugs)
Sub Component:
Version:	unspecified
Hardware:	All Linux

Priority	medium Severity medium
Target Milestone:	---
Target Release:	---
Assigned To:	Red Hat Product Security
QA Contact:
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URL:
Whiteboard:	impact=moderate,public=20160802,repor...
Keywords:	Security

Depends On:
Blocks:	1360577
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Reported:	2016-08-01 02:20 EDT by Huzaifa S. Sidhpurwala
Modified:	2016-08-03 00:59 EDT (History)
CC List:	1 user (show)

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Last Closed:	2016-08-03 00:59:24 EDT
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Description Huzaifa S. Sidhpurwala 2016-08-01 02:20:56 EDT

Security researcher Firas Salem reported that decoding url-encoded values in data: urls for display leads to potential spoofing in the Location bar by using non-ASCII and emoji characters in a data: url's mediatype. This issue could result in the wrong URL being displayed as a location, which can mislead users to believe they are on a different site than the one loaded. 


External Reference:

https://www.mozilla.org/security/announce/2016/mfsa2016-66.html


Acknowledgements:

Name: the Mozilla project
Upstream: Firas Salem

Statement:

This issue does not affect the version of firefox and thunderbird as shipped with Red Hat Enterprise Linux 5, 6 and 7.

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