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Category:   Application (Web Browser)  >   Mozilla Firefox Vendors:   Mozilla.org
(Red Hat Issues Fix) Mozilla Firefox Flaws Lets Remote Users Obtain Potentially Sensitive Information on the Target System
SecurityTracker Alert ID:  1039957
SecurityTracker URL:  http://securitytracker.com/id/1039957
CVE Reference:   CVE-2017-7843   (Links to External Site)
Date:  Dec 5 2017
Impact:   Disclosure of system information, Disclosure of user information
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): prior to 57.0.1
Description:   Two vulnerabilities were reported in Mozilla Firefox. A remote user can obtain potentially sensitive information on the target system.

A remote user can create specially crafted HTML that, when loaded by the target user in Private Browsing mode, will write data to IndexedDB that can be stored to persist across multiple private browsing mode sessions [CVE-2017-7843].

A remote user can create a specially crafted SVG image that, when loaded by the target user, will query user history and determine other pages a user has in their history [CVE-2017-7844]. Version 57 is affected.

Daniel Jackson and Konark reported these vulnerabilities.

Impact:   A remote user can obtain potentially sensitive information on the target system.
Solution:   Red Hat has issued a fix for CVE-2017-7843.

The Red Hat advisory is available at:

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

Vendor URL:  access.redhat.com/errata/RHSA-2017:3382 (Links to External Site)
Cause:   Access control error
Underlying OS:  Linux (Red Hat Enterprise)
Underlying OS Comments:  6, 7

Message History:   This archive entry is a follow-up to the message listed below.
Dec 5 2017 Mozilla Firefox Flaws Lets Remote Users Obtain Potentially Sensitive Information on the Target System



 Source Message Contents

Subject:  [RHSA-2017:3382-01] Important: firefox security update

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

=====================================================================
                   Red Hat Security Advisory

Synopsis:          Important: firefox security update
Advisory ID:       RHSA-2017:3382-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://access.redhat.com/errata/RHSA-2017:3382
Issue date:        2017-12-04
CVE Names:         CVE-2017-7843 
=====================================================================

1. Summary:

An update for firefox is now available for Red Hat Enterprise Linux 6 and
Red Hat Enterprise Linux 7.

Red Hat Product Security has rated this update as having a security impact
of Important. A Common Vulnerability Scoring System (CVSS) base score,
which gives a detailed severity rating, is available for each vulnerability
from the CVE link(s) in the References section.

2. Relevant releases/architectures:

Red Hat Enterprise Linux Client (v. 7) - x86_64
Red Hat Enterprise Linux Client Optional (v. 7) - x86_64
Red Hat Enterprise Linux Desktop (v. 6) - i386, x86_64
Red Hat Enterprise Linux Desktop Optional (v. 6) - x86_64
Red Hat Enterprise Linux HPC Node Optional (v. 6) - x86_64
Red Hat Enterprise Linux Server (v. 6) - i386, ppc64, s390x, x86_64
Red Hat Enterprise Linux Server (v. 7) - ppc64, ppc64le, s390x, x86_64
Red Hat Enterprise Linux Server Optional (v. 6) - ppc64, s390x, x86_64
Red Hat Enterprise Linux Server Optional (v. 7) - ppc64, s390x, x86_64
Red Hat Enterprise Linux Workstation (v. 6) - i386, x86_64
Red Hat Enterprise Linux Workstation (v. 7) - x86_64
Red Hat Enterprise Linux Workstation Optional (v. 6) - x86_64
Red Hat Enterprise Linux Workstation Optional (v. 7) - x86_64
Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server (v. 7) - aarch64, ppc64le

3. Description:

Mozilla Firefox is an open source web browser.

This update upgrades Firefox to version 52.5.1 ESR.

Security Fix(es):

* 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. (CVE-2017-7843)

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

4. Solution:

For details on how to apply this update, which includes the changes
described in this advisory, refer to:

https://access.redhat.com/articles/11258

After installing the update, Firefox must be restarted for the changes to
take effect.

5. Bugs fixed (https://bugzilla.redhat.com/):

1518566 - CVE-2017-7843 Mozilla: Web worker in Private Browsing mode can write IndexedDB data

6. Package List:

Red Hat Enterprise Linux Desktop (v. 6):

Source:
firefox-52.5.1-1.el6_9.src.rpm

i386:
firefox-52.5.1-1.el6_9.i686.rpm
firefox-debuginfo-52.5.1-1.el6_9.i686.rpm

x86_64:
firefox-52.5.1-1.el6_9.x86_64.rpm
firefox-debuginfo-52.5.1-1.el6_9.x86_64.rpm

Red Hat Enterprise Linux Desktop Optional (v. 6):

x86_64:
firefox-52.5.1-1.el6_9.i686.rpm
firefox-debuginfo-52.5.1-1.el6_9.i686.rpm

Red Hat Enterprise Linux HPC Node Optional (v. 6):

Source:
firefox-52.5.1-1.el6_9.src.rpm

x86_64:
firefox-52.5.1-1.el6_9.i686.rpm
firefox-52.5.1-1.el6_9.x86_64.rpm
firefox-debuginfo-52.5.1-1.el6_9.i686.rpm
firefox-debuginfo-52.5.1-1.el6_9.x86_64.rpm

Red Hat Enterprise Linux Server (v. 6):

Source:
firefox-52.5.1-1.el6_9.src.rpm

i386:
firefox-52.5.1-1.el6_9.i686.rpm
firefox-debuginfo-52.5.1-1.el6_9.i686.rpm

ppc64:
firefox-52.5.1-1.el6_9.ppc64.rpm
firefox-debuginfo-52.5.1-1.el6_9.ppc64.rpm

s390x:
firefox-52.5.1-1.el6_9.s390x.rpm
firefox-debuginfo-52.5.1-1.el6_9.s390x.rpm

x86_64:
firefox-52.5.1-1.el6_9.x86_64.rpm
firefox-debuginfo-52.5.1-1.el6_9.x86_64.rpm

Red Hat Enterprise Linux Server Optional (v. 6):

ppc64:
firefox-52.5.1-1.el6_9.ppc.rpm
firefox-debuginfo-52.5.1-1.el6_9.ppc.rpm

s390x:
firefox-52.5.1-1.el6_9.s390.rpm
firefox-debuginfo-52.5.1-1.el6_9.s390.rpm

x86_64:
firefox-52.5.1-1.el6_9.i686.rpm
firefox-debuginfo-52.5.1-1.el6_9.i686.rpm

Red Hat Enterprise Linux Workstation (v. 6):

Source:
firefox-52.5.1-1.el6_9.src.rpm

i386:
firefox-52.5.1-1.el6_9.i686.rpm
firefox-debuginfo-52.5.1-1.el6_9.i686.rpm

x86_64:
firefox-52.5.1-1.el6_9.x86_64.rpm
firefox-debuginfo-52.5.1-1.el6_9.x86_64.rpm

Red Hat Enterprise Linux Workstation Optional (v. 6):

x86_64:
firefox-52.5.1-1.el6_9.i686.rpm
firefox-debuginfo-52.5.1-1.el6_9.i686.rpm

Red Hat Enterprise Linux Client (v. 7):

Source:
firefox-52.5.1-1.el7_4.src.rpm

x86_64:
firefox-52.5.1-1.el7_4.x86_64.rpm
firefox-debuginfo-52.5.1-1.el7_4.x86_64.rpm

Red Hat Enterprise Linux Client Optional (v. 7):

x86_64:
firefox-52.5.1-1.el7_4.i686.rpm
firefox-debuginfo-52.5.1-1.el7_4.i686.rpm

Red Hat Enterprise Linux Server (v. 7):

Source:
firefox-52.5.1-1.el7_4.src.rpm

ppc64:
firefox-52.5.1-1.el7_4.ppc64.rpm
firefox-debuginfo-52.5.1-1.el7_4.ppc64.rpm

ppc64le:
firefox-52.5.1-1.el7_4.ppc64le.rpm
firefox-debuginfo-52.5.1-1.el7_4.ppc64le.rpm

s390x:
firefox-52.5.1-1.el7_4.s390x.rpm
firefox-debuginfo-52.5.1-1.el7_4.s390x.rpm

x86_64:
firefox-52.5.1-1.el7_4.x86_64.rpm
firefox-debuginfo-52.5.1-1.el7_4.x86_64.rpm

Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server (v. 7):

Source:
firefox-52.5.1-1.el7_4.src.rpm

aarch64:
firefox-52.5.1-1.el7_4.aarch64.rpm
firefox-debuginfo-52.5.1-1.el7_4.aarch64.rpm

ppc64le:
firefox-52.5.1-1.el7_4.ppc64le.rpm
firefox-debuginfo-52.5.1-1.el7_4.ppc64le.rpm

Red Hat Enterprise Linux Server Optional (v. 7):

ppc64:
firefox-52.5.1-1.el7_4.ppc.rpm
firefox-debuginfo-52.5.1-1.el7_4.ppc.rpm

s390x:
firefox-52.5.1-1.el7_4.s390.rpm
firefox-debuginfo-52.5.1-1.el7_4.s390.rpm

x86_64:
firefox-52.5.1-1.el7_4.i686.rpm
firefox-debuginfo-52.5.1-1.el7_4.i686.rpm

Red Hat Enterprise Linux Workstation (v. 7):

Source:
firefox-52.5.1-1.el7_4.src.rpm

x86_64:
firefox-52.5.1-1.el7_4.x86_64.rpm
firefox-debuginfo-52.5.1-1.el7_4.x86_64.rpm

Red Hat Enterprise Linux Workstation Optional (v. 7):

x86_64:
firefox-52.5.1-1.el7_4.i686.rpm
firefox-debuginfo-52.5.1-1.el7_4.i686.rpm

These packages are GPG signed by Red Hat for security.  Our key and
details on how to verify the signature are available from
https://access.redhat.com/security/team/key/

7. References:

https://access.redhat.com/security/cve/CVE-2017-7843
https://access.redhat.com/security/updates/classification/#important
https://www.mozilla.org/en-US/security/advisories/mfsa2017-27/#CVE-2017-7843

8. Contact:

The Red Hat security contact is <secalert@redhat.com>. More contact
details at https://access.redhat.com/security/team/contact/

Copyright 2017 Red Hat, Inc.
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