CVE-2023-42457

Advisory

Plone.rest allows users to use HTTP verbs such as GET, POST, PUT, DELETE, etc. in Plone. Starting in the 2.x branch and prior to versions 2.0.1 and 3.0.1, when the `++api++` traverser is accidentally used multiple times in a url, handling it takes increasingly longer, making the server less responsive. Patches are available in `plone.rest` 2.0.1 and 3.0.1. Series 1.x is not affected. As a workaround, one may redirect `/++api++/++api++` to `/++api++` in one's frontend web server (nginx, Apache).

Affected package

Affected versions

Fixed versions

Vulnerability changelog

------------------

Bug fixes:


- When ``++api++`` is in the url multiple times, redirect to the proper url.
When the url is badly formed, for example ``++api++/something/++api++``, give a 404 NotFound.
Fixes a denial of service.
See `security advisory <https://github.com/plone/plone.rest/security/advisories/GHSA-h6rp-mprm-xgcq>`_.
[maurits] (1)

Resources

• https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-42457
• https://github.com/plone/plone.rest/security/advisories/GHSA-h6rp-mprm-xgcq
• https://github.com/plone/plone.rest/commit/77846a9842889b24f35e8bedc2e9d461388d3302
• https://github.com/plone/plone.rest/commit/43b4a7e86206e237e1de5ca3817ed071575882f7
• http://www.openwall.com/lists/oss-security/2023/09/22/2