Bug 1277339 (CVE-2015-4518) - CVE-2015-4518 Mozilla: CSP bypass due to permissive Reader mode whitelist (MFSA 2015-118)
Summary: CVE-2015-4518 Mozilla: CSP bypass due to permissive Reader mode whitelist (MF...
Keywords:
Status: CLOSED NOTABUG
Alias: CVE-2015-4518
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: 1275590
TreeView+ depends on / blocked
 
Reported: 2015-11-03 05:45 UTC by Huzaifa S. Sidhpurwala
Modified: 2023-05-12 11:08 UTC (History)
1 user (show)

Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Clone Of:
Environment:
Last Closed: 2015-11-04 04:57:40 UTC
Embargoed:


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Description Huzaifa S. Sidhpurwala 2015-11-03 05:45:45 UTC
Security researcher Mario Heiderich reported an issue where the security protections of Reader mode in Firefox can be bypassed, allowing scripts to be run. Mozilla developer Frederik Braun independently discovered and reported this same issue as well. This issue happens even though Reader View explicitly disables script for rendered pages through a whitelist of allowed HTML content. Mario discovered that the whitelist was too permissive and a malicious site could manipulate content to bypass CSP protections, allowing for possible cross-site scripting (XSS) attacks.



External Reference:

https://www.mozilla.org/security/announce/2015/mfsa2015-118.html


Acknowledgements:

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

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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