Bug 1315569 (CVE-2016-1954)

Summary: CVE-2016-1954 Mozilla: Local file overwriting and potential privilege escalation through CSP reports (MFSA 2016-17)
Product: [Other] Security Response Reporter: Huzaifa S. Sidhpurwala <huzaifas>
Component: vulnerabilityAssignee: Red Hat Product Security <security-response-team>
Status: CLOSED ERRATA QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: cschalle, jhorak, security-response-team, stransky
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
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Fixed In Version: Doc Type: Bug Fix
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Last Closed: 2016-03-28 05:22:39 UTC Type: ---
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
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Bug Depends On:    
Bug Blocks: 1313724    

Description Huzaifa S. Sidhpurwala 2016-03-08 06:01:19 UTC 
Security researcher Nicolas Golubovic reported that a malicious page can overwrite files on the user's machine using Content Security Policy (CSP) violation reports. The file contents are restricted to the JSON format of the report. In many cases overwriting a local file is simply be destructive, breaking the functionality of that file. The CSP error reports can include HTML fragments which could be rendered by browsers. If a user has disabled add-on signing and has installed an "unpacked" add-on, a malicious page could overwrite one of the add-on resources. Depending on how this resource is used, this could lead to privilege escalation.



External Reference:

https://www.mozilla.org/security/announce/2016/mfsa2016-17.html


Acknowledgements:

Name: the Mozilla project
Upstream: Nicolas Golubovic
Comment 1 errata-xmlrpc 2016-03-09 05:11:59 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 6
  Red Hat Enterprise Linux 7
  Red Hat Enterprise Linux 5

Via RHSA-2016:0373 https://rhn.redhat.com/errata/RHSA-2016-0373.html
Comment 2 errata-xmlrpc 2016-03-16 17:37:05 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 6
  Red Hat Enterprise Linux 5
  Red Hat Enterprise Linux 7

Via RHSA-2016:0460 https://rhn.redhat.com/errata/RHSA-2016-0460.html