[Pkg-javascript-devel] Bug#1034481: ckeditor: CVE-2023-28439

[Salvatore Bonaccorso]

Source: ckeditor
Version: 4.19.1+dfsg-1
Severity: important
Tags: security upstream
X-Debbugs-Cc: carnil at debian.org, Debian Security Team <team at security.debian.org>

Hi,

The following vulnerability was published for ckeditor.

CVE-2023-28439[0]:
| CKEditor4 is an open source what-you-see-is-what-you-get HTML editor.
| A cross-site scripting vulnerability has been discovered affecting
| Iframe Dialog and Media Embed packages. The vulnerability may trigger
| a JavaScript code after fulfilling special conditions: using one of
| the affected packages on a web page with missing proper Content
| Security Policy configuration; initializing the editor on an element
| and using an element other than `<textarea>` as a base; and
| destroying the editor instance. This vulnerability might affect a
| small percentage of integrators that depend on dynamic editor
| initialization/destroy mechanism. A fix is available in CKEditor4
| version 4.21.0. In some rare cases, a security fix may be considered a
| breaking change. Starting from version 4.21.0, the Iframe Dialog
| plugin applies the `sandbox` attribute by default, which restricts
| JavaScript code execution in the iframe element. To change this
| behavior, configure the `config.iframe_attributes` option. Also
| starting from version 4.21.0, the Media Embed plugin regenerates the
| entire content of the embed widget by default. To change this
| behavior, configure the `config.embed_keepOriginalContent` option.
| Those who choose to enable either of the more permissive options or
| who cannot upgrade to a patched version should properly configure
| Content Security Policy to avoid any potential security issues that
| may arise from embedding iframe elements on their web page.


If you fix the vulnerability please also make sure to include the
CVE (Common Vulnerabilities & Exposures) id in your changelog entry.

For further information see:

[0] https://security-tracker.debian.org/tracker/CVE-2023-28439
    https://www.cve.org/CVERecord?id=CVE-2023-28439
[1] https://github.com/ckeditor/ckeditor4/security/advisories/GHSA-vh5c-xwqv-cv9g
[2] https://github.com/ckeditor/ckeditor4/commit/b85af23f020a61397c6c0024aef73f2c7f62bfef

Please adjust the affected versions in the BTS as needed.

Regards,
Salvatore