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)
CVE-2015-4490 Mozilla: Mozilla Content Security Policy allows for asterisk wi...
Product: Security Response
Classification: Other
Component: vulnerability (Show other bugs)
All Linux
medium Severity medium
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Assigned To: Red Hat Product Security
: 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)
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. 

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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

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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