Bug 1252294 – CVE-2015-4490 Mozilla: Mozilla Content Security Policy allows for asterisk wildcards in violation of CSP specification (MFSA 2015-91)

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Bug 1252294 - (CVE-2015-4490) CVE-2015-4490 Mozilla: Mozilla Content Security Policy allows for asterisk wildcards in violation of CSP specification (MFSA 2015-91)

Summary:	CVE-2015-4490 Mozilla: Mozilla Content Security Policy allows for asterisk wi...

Status:	CLOSED NOTABUG

Aliases:	CVE-2015-4490

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=20150811,repor...
Keywords:	Security

Depends On:
Blocks:	1251515
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Reported:	2015-08-11 02:35 EDT by Huzaifa S. Sidhpurwala
Modified:	2015-11-24 07:23 EST (History)
CC List:	3 users (show)

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Doc Type:	Bug Fix
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Last Closed:	2015-08-12 00:37:51 EDT
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Description Huzaifa S. Sidhpurwala 2015-08-11 02:35:07 EDT

Mozilla security engineer Christoph Kerschbaumer reported a discrepancy in Mozilla's implementation of Content Security Policy and the CSP specification. The specification states that blob:, data:, and filesystem: URLs should be excluded in case of a wildcard when matching source expressions but Mozilla's implementation allows these in the case of an asterisk wildcard. This could allow for more permissive CSP usage than expected by a web developer, possibly allowing for cross-site scripting (XSS) attacks. 


External Reference:

https://www.mozilla.org/security/announce/2015/mfsa2015-91.html


Acknowledgements:

Red Hat would like to thank the Mozilla project for reporting this issue. Upstream acknowledges Christoph Kerschbaumer as the original reporter.

Comment 1 Huzaifa S. Sidhpurwala 2015-08-24 06:00:01 EDT

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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