| Name | CVE-2021-44223 |
| Description | WordPress before 5.8 lacks support for the Update URI plugin header. This makes it easier for remote attackers to execute arbitrary code via a supply-chain attack against WordPress installations that use any plugin for which the slug satisfies the naming constraints of the WordPress.org Plugin Directory but is not yet present in that directory. |
| Source | CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) |
Vulnerable and fixed packages
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|
| wordpress (PTS) | bullseye (security), bullseye | 5.7.11+dfsg1-0+deb11u1 | vulnerable |
| bookworm, bookworm (security) | 6.1.6+dfsg1-0+deb12u1 | fixed |
| sid, trixie | 6.6.1+dfsg1-1 | fixed |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|
| wordpress | source | (unstable) | 5.8.1+dfsg1-1 | | | |
Notes
[bullseye] - wordpress <no-dsa> (Minor issue; workarounds/mitigation for older versions can be implemented)
[buster] - wordpress <no-dsa> (Minor issue; workarounds/mitigation for older versions can be implemented)
[stretch] - wordpress <no-dsa> (Minor issue; workarounds/mitigation for older versions can be implemented)
WordPress 5.8 introduces a new "Update URI" plugin header. Further mitigation
options documented in:
https://vavkamil.cz/2021/11/25/wordpress-plugin-confusion-update-can-get-you-pwned/
https://make.wordpress.org/core/2021/06/29/introducing-update-uri-plugin-header-in-wordpress-5-8/