ASB-2017.0206 - [Win][UNIX/Linux] WordPress: Execute arbitrary code/commands - Existing account 2017-11-30

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                         AUSCERT Security Bulletin

                               ASB-2017.0206
             WordPress 4.9.1 Security and Maintenance Release
                             30 November 2017

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

Product:              WordPress
Operating System:     UNIX variants (UNIX, Linux, OSX)
                      Windows
Impact/Access:        Execute Arbitrary Code/Commands -- Existing Account
                      Provide Misleading Information  -- Existing Account
                      Reduced Security                -- Existing Account
Resolution:           Patch/Upgrade
Member content until: Saturday, December 30 2017

OVERVIEW

        Multiple vulnerabilities have been identified in WordPress prior to
        version 4.9.1. [1]


IMPACT

        The vendor has provided the following details regarding the
        vulnerability:
        
        "WordPress versions 4.9 and earlier are affected by four security 
        issues which could potentially be exploited as part of a 
        multi-vector attack. As part of the core team's ongoing commitment 
        to security hardening, the following fixes have been implemented in
        4.9.1:
        Use a properly generated hash for the newbloguser key instead of a 
        determinate substring.
        Add escaping to the language attributes used on html elements.
        Ensure the attributes of enclosures are correctly escaped in RSS and
        Atom feeds.
        Remove the ability to upload JavaScript files for users who do not 
        have the unfiltered_html capability."[1]


MITIGATION

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


REFERENCES

        [1] WordPress 4.9.1 Security and Maintenance Release
            https://wordpress.org/news/2017/11/wordpress-4-9-1-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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