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                         AUSCERT Security Bulletin

                               ASB-2017.0017
             WordPress 4.7.3 Security and Maintenance Release
                               7 March 2017

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

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

Product:              WordPress
Operating System:     UNIX variants (UNIX, Linux, OSX)
                      Windows
Impact/Access:        Cross-site Request Forgery     -- Remote with User Interaction
                      Delete Arbitrary Files         -- Existing Account            
                      Cross-site Scripting           -- Remote with User Interaction
                      Provide Misleading Information -- Remote with User Interaction
Resolution:           Patch/Upgrade
Member content until: Thursday, April  6 2017

OVERVIEW

        Multiple vulnerabilities have been identified in WordPress prior to
        version 4.7.3. [1]


IMPACT

        The vendor has provided the following details regarding the 
        vulnerability:
        
        "Cross-site scripting (XSS) via media file metadata. Reported by 
        Chris Andrè Dale, Yorick Koster, and Simon P. Briggs.
        
        Control characters can trick redirect URL validation. Reported by 
        Daniel Chatfield.
        
        Unintended files can be deleted by administrators using the plugin 
        deletion functionality. Reported by xuliang.
        
        Cross-site scripting (XSS) via video URL in YouTube embeds. Reported
        by Marc Montpas.
        
        Cross-site scripting (XSS) via taxonomy term names. Reported by 
        Delta.
        
        Cross-site request forgery (CSRF) in Press This leading to excessive
        use of server resources. Reported by Sipke Mellema." [1]


MITIGATION

        The vendor strongly encourages users to update to the latest 
        version. [1]


REFERENCES

        [1] WordPress 4.7.3 Security and Maintenance Release
            https://wordpress.org/news/2017/03/wordpress-4-7-3-security-and-maintenance-release/

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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