Headline
CVE-2023-42457: Denial of Service when ++api++ is used many times
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).
Package
pip plone.rest (pip)
Affected versions
2.0.0, 3.0.0
Patched versions
2.0.1, 3.0.1
Description
Impact
When the ++api++ traverser is accidentally used multiple times in a url, handling it takes increasingly longer, making the server less responsive.
Patches
Patches will be released in plone.rest 2.0.1 and 3.0.1. Series 1.x is not affected.
Workarounds
In your frontend web server (nginx, Apache) you can redirect /++api++/++api++ to /++api++.
Credits
This was reported to the Plone Security Team by Fred van Dijk. Thanks!
Related news
### Impact When the `++api++` traverser is accidentally used multiple times in a url, handling it takes increasingly longer, making the server less responsive. ### Patches Patches will be released in `plone.rest` 2.0.1 and 3.0.1. Series 1.x is not affected. ### Workarounds In your frontend web server (nginx, Apache) you can redirect `/++api++/++api++` to `/++api++`.