Bug 1252294 (CVE-2015-4490)

Summary:	CVE-2015-4490 Mozilla: Mozilla Content Security Policy allows for asterisk wildcards in violation of CSP specification (MFSA 2015-91)
Product:	[Other] Security Response	Reporter:	Huzaifa S. Sidhpurwala <huzaifas>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED NOTABUG	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	jhorak, security-response-team, stransky
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2015-08-12 04:37:51 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:
Bug Blocks:	1251515

Description Huzaifa S. Sidhpurwala 2015-08-11 06:35:07 UTC

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 10:00:01 UTC

Statement:

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