Bug 1236953 (CVE-2015-2731)

Summary: CVE-2015-2731 Mozilla: Use-after-free in Content Policy due to microtask execution error (MFSA 2015-63)
Product: [Other] Security Response Reporter: Huzaifa S. Sidhpurwala <huzaifas>
Component: vulnerabilityAssignee: Red Hat Product Security <security-response-team>
Status: CLOSED ERRATA QA Contact:
Severity: urgent Docs Contact:
Priority: urgent    
Version: unspecifiedCC: chazlett, cschalle, jhorak, jrusnack, 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: 2015-07-20 17:53:33 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: 1235754    

Description Huzaifa S. Sidhpurwala 2015-06-30 05:02:42 UTC 
Security researcher Herre reported a use-after-free vulnerability when a Content Policy modifies the Document Object Model to remove a DOM object, which is then used afterwards due to an error in microtask implementation. This leads to an exploitable crash.

In general this flaw cannot be exploited through email in the Thunderbird product because scripting is disabled, but is potentially a risk in browser or browser-like contexts.


External Reference:

http://www.mozilla.org/security/announce/2015/mfsa2015-63.html


Acknowledgements:

Red Hat would like to thank the Mozilla project for reporting this issue. Upstream acknowledges Herre as the original reporter.
Comment 1 errata-xmlrpc 2015-07-03 05:13:25 UTC 
This issue has been addressed in the following products:

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

Via RHSA-2015:1207 https://rhn.redhat.com/errata/RHSA-2015-1207.html
Comment 2 errata-xmlrpc 2015-07-20 16:35:50 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-2015:1455 https://rhn.redhat.com/errata/RHSA-2015-1455.html