GHSA-r82h-mqw3-fc56
plone.app.event vulnerable to denial of service via iCalendar import
Quick fix
GHSA-r82h-mqw3-fc56 — plone-app-event: upgrade to the fixed version with the command below.
pip install --upgrade 'plone-app-event>=5.2.4'Details
### Impact By abusing the iCalendar import functionality, a logged-in editor could take the whole site offline, make the server reach into the internal network and read calendar files off disk (SSRF), and store XSS.
### Patches The problem has been patched in `plone.app.event`.
* For Plone 6.2: upgrade to `plone.app.event` 6.0.1 * For Plone 6.1: upgrade to `plone.app.event` 5.2.4 * For Plone 6.0: upgrade to `plone.app.event` 5.2.4
### Workarounds In the site root, go to the Security tab of the Zope Management Interface (`manage_access`), look for the "plone.app.event: Import Ical" permission, and grant this only to the Manager role. Then only users with the Manager role can use the ical import form.
There is no workaround for the stored XSS in the URL field of events.
The vulnerabilities were discovered by Timothy Dudley and responsibly reported to the [Plone Security Team](mailto:security@plone.org). Thank you!
Are you affected?
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Affected packages
0Fixed in: 5.2.4pip install --upgrade 'plone-app-event>=5.2.4'6.0.0a1Fixed in: 6.0.1pip install --upgrade 'plone-app-event>=6.0.1'References
- https://github.com/plone/plone.app.event/security/advisories/GHSA-r82h-mqw3-fc56[WEB]
- https://github.com/plone/plone.app.event/commit/1e3c83c15a24d1a789cdb012593505bc5620e28e[WEB]
- https://github.com/plone/plone.app.event/commit/4de5eb3ea9e4f7f1781622e6d64fc086629d1437[WEB]
- https://github.com/plone/plone.app.event[PACKAGE]
- https://github.com/plone/plone.app.event/releases/tag/5.2.4[WEB]
- https://github.com/plone/plone.app.event/releases/tag/6.0.1[WEB]