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                         AUSCERT Security Bulletin

                               ASB-2017.0207
               Mozilla Foundation Security Advisory 2017-27
                              5 December 2017

===========================================================================

        AusCERT Security Bulletin Summary
        ---------------------------------

Product:              firefox
Operating System:     UNIX variants (UNIX, Linux, OSX)
                      Windows
Impact/Access:        Reduced Security         -- Remote with User Interaction
                      Access Confidential Data -- Remote with User Interaction
Resolution:           Patch/Upgrade
CVE Names:            CVE-2017-7843 CVE-2017-7844 
Member content until: Thursday, January  4 2018

OVERVIEW

        "Security vulnerabilities fixed in Firefox 57.0.1" [1]


IMPACT

        Mozilla has given the following information concerning these
        vulnerabilities:
        
        "#CVE-2017-7843: Web worker in Private Browsing mode can write 
        IndexedDB data
        
        REPORTER	Konark
        IMPACT		HIGH
        
        Description
        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.
        
        References
        Bug 1410106
        
        #CVE-2017-7844: Visited history information leak through SVG image
        
        REPORTER	Daniel Jackson
        IMPACT		HIGH
        
        Description
        A combination of an external SVG image referenced on a page and the
        coloring of anchor links stored within this image can be used to 
        determine which pages a user has in their history. This can allow a
        malicious website to query user history.
        
        Note: This issue only affects Firefox 57. Earlier releases are not 
        affected.
        
        References
        Bug 1420001" [1]


MITIGATION

        Mozilla recommends updating Firefox to version 57.0.1


REFERENCES

        [1] Mozilla Foundation Security Advisory 2017-27
            https://www.mozilla.org/en-US/security/advisories/mfsa2017-27/

AusCERT has made every effort to ensure that the information contained
in this document is accurate.  However, the decision to use the information
described is the responsibility of each user or organisation. The decision to
follow or act on information or advice contained in this security bulletin is
the responsibility of each user or organisation, and should be considered in
accordance with your organisation's site policies and procedures. AusCERT
takes no responsibility for consequences which may arise from following or
acting on information or advice contained in this security bulletin.

===========================================================================
Australian Computer Emergency Response Team
The University of Queensland
Brisbane
Qld 4072

Internet Email: auscert@auscert.org.au
Facsimile:      (07) 3365 7031
Telephone:      (07) 3365 4417 (International: +61 7 3365 4417)
                AusCERT personnel answer during Queensland business hours 
                which are GMT+10:00 (AEST).
                On call after hours for member emergencies only.
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