Decidim prior 0.27.5/0.28.0 Upload Request cross site scripting

Summaryinfo

A vulnerability was found in Decidim. It has been classified as problematic. This affects an unknown part of the component Upload Request Handler. This manipulation causes cross site scripting. This vulnerability is registered as CVE-2023-51447. Remote exploitation of the attack is possible. No exploit is available. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability has been found in Decidim and classified as problematic. Affected by this vulnerability is an unknown code block of the component Upload Request Handler. The manipulation with an unknown input leads to a cross site scripting vulnerability. The CWE definition for the vulnerability is CWE-79. The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. As an impact it is known to affect integrity. The summary by CVE is:

Decidim is a participatory democracy framework. Starting in version 0.27.0 and prior to versions 0.27.5 and 0.28.0, the dynamic file upload feature is subject to potential cross-site scripting attacks in case the attacker manages to modify the file names of the records being uploaded to the server. This appears in sections where the user controls the file upload dialogs themselves and has the technical knowledge to change the file names through the dynamic upload endpoint. Therefore I believe it would require the attacker to control the whole session of the particular user but in any case, this needs to be fixed. Successful exploit of this vulnerability would require the user to have successfully uploaded a file blob to the server with a malicious file name and then have the possibility to direct the other user to the edit page of the record where the attachment is attached. The users are able to craft the direct upload requests themselves controlling the file name that gets stored to the database. The attacker is able to change the filename e.g. to `` if they know how to craft these requests themselves. And then enter the returned blob ID to the form inputs manually by modifying the edit page source. Versions 0.27.5 and 0.28.0 contain a patch for this issue. As a workaround, disable dynamic uploads for the instance, e.g. from proposals.

The weakness was published 02/20/2024 as GHSA-9w99-78rj-hmxq. The advisory is shared at github.com. This vulnerability is known as CVE-2023-51447 since 12/19/2023. It demands that the victim is doing some kind of user interaction. Neither technical details nor an exploit are publicly available. MITRE ATT&CK project uses the attack technique T1059.007 for this issue.

Upgrading to version 0.27.5 or 0.28.0 eliminates this vulnerability. The upgrade is hosted for download at github.com. Applying the patch aaf72787cf18beeeb6a771c1f7cbb7654b073423 is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

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Productinfo

Name

• Decidim

License

• open-source

Website

• Product: https://github.com/decidim/decidim/

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