Bug 1291578 - (CVE-2015-7204) CVE-2015-7204 Mozilla: Crash with JavaScript variable assignment with unboxed objects (MFSA 2015-135)
CVE-2015-7204 Mozilla: Crash with JavaScript variable assignment with unboxed...
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: 1290704
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Reported: 2015-12-15 03:24 EST by Huzaifa S. Sidhpurwala
Modified: 2016-03-01 04:28 EST (History)
2 users (show)

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Doc Type: Bug Fix
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Last Closed: 2015-12-16 04:03:17 EST
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Description Huzaifa S. Sidhpurwala 2015-12-15 03:24:39 EST
Security researcher Cajus Pollmeier reported that Firefox 41 was crashing during some Javascript variable assignments. The issue was caused by an implementation error with unboxed objects and property storing in the JavaScript engine. This error could result in a potentially exploitable crash when triggered by JavaScript content as well as leading to errors on some websites.

This crash was caused by a change to the JavaScript engine was first shipped in Firefox 41. Earlier versions of Firefox are unaffected by this problem, including Firefox ESR 38.

External Reference:



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


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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