[SECURITY] [DLA 2371-1] wordpress security update

Debian LTS Advisory DLA-2371-1 [email protected]
https://www.debian.org/lts/security/
September 11, 2020 https://wiki.debian.org/LTS

Package : wordpress
Version : 4.7.18+dfsg-1+deb9u1
CVE ID : CVE-2019-17670 CVE-2020-4047 CVE-2020-4048 CVE-2020-4049
CVE-2020-4050
Debian Bug : 942459 962685

Multiple vulnerabilities were discovered in Wordpress, a popular
content management framework.

CVE-2019-17670

WordPress has a Server Side Request Forgery (SSRF) vulnerability
because Windows paths are mishandled during certain validation of
relative URLs.

CVE-2020-4047

Authenticated users with upload permissions (like authors) are
able to inject JavaScript into some media file attachment pages in
a certain way. This can lead to script execution in the context of
a higher privileged user when the file is viewed by them.

CVE-2020-4048

Due to an issue in wp_validate_redirect() and URL sanitization, an
arbitrary external link can be crafted leading to unintended/open
redirect when clicked.

CVE-2020-4049

When uploading themes, the name of the theme folder can be crafted
in a way that could lead to JavaScript execution in /wp-admin on
the themes page.

CVE-2020-4050

Misuse of the `set-screen-option` filter's return value allows
arbitrary user meta fields to be saved. It does require an admin
to install a plugin that would misuse the filter. Once installed,
it can be leveraged by low privileged users.

Additionally, this upload ensures latest comments can only be viewed
from public posts, and fixes back the user activation procedure.

For Debian 9 stretch, these problems have been fixed in version
4.7.18+dfsg-1+deb9u1.

We recommend that you upgrade your wordpress packages.

For the detailed security status of wordpress please refer to
its security tracker page at:
https://security-tracker.debian.org/tracker/wordpress

Further information about Debian LTS security advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://wiki.debian.org/LTS