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...
Keywords:
Status: CLOSED NOTABUG
Alias: CVE-2015-4490
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:
Blocks: 1251515
TreeView+ depends on / blocked
 
Reported: 2015-08-11 06:35 UTC by Huzaifa S. Sidhpurwala
Modified: 2023-05-12 10:13 UTC (History)
3 users (show)

Fixed In Version:
Doc Type: Bug Fix
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Clone Of:
Environment:
Last Closed: 2015-08-12 04:37:51 UTC
Embargoed:

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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.
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