Wordpress: Multiple vulnerabilities

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                         AUSCERT Security Bulletin

                               ASB-2020.0094
             WordPress 5.4.1 Security and Maintenance Release
                                1 May 2020

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

Product:              Wordpress
Operating System:     Windows
                      UNIX variants (UNIX, Linux, OSX)
Impact/Access:        Cross-site Scripting     -- Remote with User Interaction
                      Access Confidential Data -- Remote/Unauthenticated      
                      Reduced Security         -- Remote/Unauthenticated      
Resolution:           Patch/Upgrade
Member content until: Sunday, May 31 2020

OVERVIEW

        A number of vulnerabilities have been identified in WordPress prior
        to version 5.4.1. [1]


IMPACT

        The vendor has provided the following information:
        
        "WordPress 5.4.1 is now available!
        
        This security and maintenance release features 17 bug fixes in addition to 7
        security fixes. Because this is a security release , it is recommended that you
        update your sites immediately. All versions since WordPress 3.7 have also been
        updated.
        
        WordPress 5.4.1 is a short-cycle security and maintenance release. The next
        major release will be version 5.5.
        
        You can download WordPress 5.4.1 by downloading from WordPress.org, or visit
        your Dashboard -> Updates and click Update Now.
        
        If you have sites that support automatic background updates, they've already
        started the update process.
        
        Security Updates
        
        Seven security issues affect WordPress versions 5.4 and earlier. If you haven't
        yet updated to 5.4, all WordPress versions since 3.7 have also been updated to
        fix the following security issues:
        
          o Props to Muaz Bin Abdus Sattar and Jannes who both independently reported
            an issue where password reset tokens were not properly invalidated
          o Props to ka1n4t for finding an issue where certain private posts can be
            viewed unauthenticated
          o Props to Evan Ricafort for discovering an XSS issue in the Customizer
          o Props to Ben Bidner from the WordPress Security Team who discovered an XSS
            issue in the search block
          o Props to Nick Daugherty from WordPress VIP / WordPress Security Team who
            discovered an XSS issue in wp-object-cache
          o Props to Ronnie Goodrich ( Kahoots ) and Jason Medeiros who independently
            reported an XSS issue in file uploads.
          o Props to Weston Ruter for fixing a stored XSS vulnerability in the
            WordPress customizer.
          o Additionally, an authenticated XSS issue in the block editor was discovered
            by Nguyen the Duc in WordPress 5.4 RC1 and RC2. It was fixed in 5.4 RC5. We
            wanted to be sure to give credit and thank them for all of their work in
            making WordPress more secure." [1]


MITIGATION

        Wordpress recommends upgrading to the version 5.4.1 to fix these issues. [1]


REFERENCES

        [1] WordPress 5.4.1
            https://wordpress.org/news/2020/04/wordpress-5-4-1/

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.

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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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