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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT Security Bulletin ASB-2018.0041 WordPress Autoupdate Regression in 4.9.3 9 February 2018 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: WordPress Operating System: UNIX variants (UNIX, Linux, OSX) Windows Impact/Access: Reduced Security -- Existing Account Resolution: Patch/Upgrade Member content until: Sunday, March 11 2018 OVERVIEW WordPress has announced a bug in version 4.9.3 which breaks the automatic update feature. [1] IMPACT 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."" [1] MITIGATION WordPress advises that users will need to upgrade to version 4.9.4 manually in order restore automatic updates. [1] REFERENCES [1] WordPress 4.9.4 Maintenance Release https://wordpress.org/news/2018/02/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 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. =========================================================================== -----BEGIN PGP SIGNATURE----- Comment: http://www.auscert.org.au/render.html?it=1967 iQIVAwUBWn0fw4x+lLeg9Ub1AQjO2g//dkM0o3ZDIlFIUsNEN+uw5M4N7Bt55HQ+ o6+7amOR+ARwkWzyyK0UindNcMwikqcPLsKbpmBsr9iS++NM2gENZs4JgXk9SQyV vc5y7JJNNdXWLAsC2EOBf5tt3/CMs0hac1kKlwK/if2L5IFhI52LSslPp8xhisgw kUSjdDhuw1MdoXKfLbzw3RVLoGtqWAZ5fJKI3hqDxLCgum4jD25K6isyLwuyS+/U +I2lqLF3YOaRGzgMK5+mIYZ05gU0BGb5BV6vMWXOfr2fGPKDcHCzkhk0AYTLAd2s yQYekGFFZQSK8ngZ/YYTcjUQJ55YzyvhVMTNj46jnhqvj8fGZQMUm0QYtMHgFcsC Qfii+a9XsBxAaDFn8hDGNVdT4Re7p7J8fR6mQZ49FmbzRQwXI2CMsqNiTCBhk2IR teYlKjNavQ4TYVxW6xCm5ZNtoTXtoklK2yAtipuU4x8uy9dAWFh06MyYf8t2JPHV WCJXeu/HSH81CmOrW2avHJZ5io3Gwo8wy9SqmGEg+eTtj99IBf4nuITI76MgpKw+ BYmX7Yb81qPhRgG7ugxegv7mC5hC3HIGBuOR1in//c0QVkmN1tvSUwx3qcpn8APC AEpPPfzpMTiDezAgtVLPKFIlpjyaGmhFrU9C+tHfI8gNFVgKzdJDP4O8FK7+c+kk 9RtoWyKHG0A= =sDui -----END PGP SIGNATURE-----