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AUSCERT Security Bulletin
WordPress Autoupdate Regression in 4.9.3
9 February 2018
AusCERT Security Bulletin Summary
Operating System: UNIX variants (UNIX, Linux, OSX)
Impact/Access: Reduced Security -- Existing Account
Member content until: Sunday, March 11 2018
WordPress has announced a bug in version 4.9.3 which breaks the
automatic update feature. 
The vendor has provided the following information:
"WordPress 4.9.4 is now available.
This maintenance release fixes a severe bug in 4.9.3, which will cause sites
that support automatic background updates to fail to update automatically, and
will require action from you (or your host) for it to be updated to 4.9.4.
Four years ago with WordPress 3.7 "Basie", we added the ability for WordPress to
self-update, keeping your website secure and bug-free, even when you weren't
available to do it yourself. For four years it's helped keep millions of
installs updated with very few issues over that time. Unfortunately yesterdays
4.9.3 release contained a severe bug which was only discovered after release.
The bug will cause WordPress to encounter an error when it attempts to update
itself to WordPress 4.9.4, and will require an update to be performed through
the WordPress dashboard or hosts update tools.
WordPress managed hosting companies who install updates automatically for their
customers can install the update as normal, and we'll be working with other
hosts to ensure that as many customers of theirs who can be automatically
updated to WordPress 4.9.4 can be.
For more technical details of the issue, we've posted on our Core Development
blog. For a full list of changes, consult the list of tickets.
Download WordPress 4.9.4 or visit Dashboard -> Updates and click "Update Now.""
WordPress advises that users will need to upgrade to version 4.9.4
manually in order restore automatic updates. 
 WordPress 4.9.4 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
Internet Email: firstname.lastname@example.org
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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