Bug 1265775 - (CVE-2015-4516) CVE-2015-4516 Mozilla: JavaScript immutable property enforcement can be bypassed (MFSA 2015-109)
CVE-2015-4516 Mozilla: JavaScript immutable property enforcement can be bypas...
Status: CLOSED NOTABUG
Product: Security Response
Classification: Other
Component: vulnerability (Show other bugs)
unspecified
All Linux
high Severity high
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Assigned To: Red Hat Product Security
impact=important,public=20150922,repo...
: Security
Depends On:
Blocks: 1261782
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Reported: 2015-09-23 13:47 EDT by Prasad J Pandit
Modified: 2015-09-24 12:42 EDT (History)
4 users (show)

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Doc Type: Bug Fix
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Last Closed: 2015-09-24 12:31:33 EDT
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Description Prasad J Pandit 2015-09-23 13:47:20 EDT
Mozilla developer Jeff Walden reported that in Gecko's implementation of
ECMAScript 5 API's enforces non-configurable properties with logic specific to
each API.  Scripts that do not go through these APIs can bypass these
protections and make changes to the immutable properties in violation of
security protections. This could potentially allow for web content to run in a
privileged context leading to arbitrary code execution.

External Reference:

https://www.mozilla.org/en-US/security/advisories/mfsa2015-109/
Comment 1 Martin Prpič 2015-09-24 08:37:13 EDT
Acknowledgements:

Red Hat would like to thank the Mozilla project for reporting this issue. Upstream acknowledges Jeff Walden as the original reporter.
Comment 2 Martin Prpič 2015-09-24 12:31:33 EDT
This issue was fixed in Firefox version 41.

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