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Bug 1518566 - (CVE-2017-7843) CVE-2017-7843 Mozilla: Web worker in Private Browsing mode can write IndexedDB data
CVE-2017-7843 Mozilla: Web worker in Private Browsing mode can write IndexedD...
Status: CLOSED ERRATA
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=20171204,repo...
: Security
Depends On: 1518567 1518568 1518569 1518570
Blocks: 1518574
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Reported: 2017-11-29 03:32 EST by Huzaifa S. Sidhpurwala
Modified: 2017-12-05 01:08 EST (History)
3 users (show)

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Doc Text:
A privacy flaw was discovered in Firefox. In Private Browsing mode, a web worker could write persistent data to IndexedDB, which was not cleared when exiting and would persist across multiple sessions. A malicious website could exploit the flaw to bypass private-browsing protections and uniquely fingerprint visitors.
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Last Closed: 2017-12-05 01:08:55 EST
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RHEL 7.3 requirements from Atomic Host:
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External Trackers
Tracker ID Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2017:3382 normal SHIPPED_LIVE Important: firefox security update 2017-12-05 05:45:18 EST

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Description Huzaifa S. Sidhpurwala 2017-11-29 03:32:30 EST 
When Private Browsing mode is used, it is possible for a web worker to write persistent data to IndexedDB and fingerprint a user uniquely. IndexedDB should not be available in Private Browsing mode and this stored data will persist across multiple private browsing mode sessions because it is not cleared when exiting.
Comment 2 Huzaifa S. Sidhpurwala 2017-11-29 03:32:41 EST 
External References:

https://www.mozilla.org/en-US/security/advisories/mfsa2017-27/#CVE-2017-7843
Comment 4 Doran Moppert 2017-11-29 22:08:57 EST 
Acknowledgments:

Name: the Mozilla project
Upstream: Konark
Comment 5 errata-xmlrpc 2017-12-05 00:45:46 EST 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 6
  Red Hat Enterprise Linux 7

Via RHSA-2017:3382 https://access.redhat.com/errata/RHSA-2017:3382
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