[Zope] Zope 4.6.1 and 5.2.1 released with an important security fix

[Jens Vagelpohl]

On behalf of Zope developer community I am pleased to announce the releases of Zope 4.6.1 and 5.2.1.

This bugfix release solves a few minor issues and also contains an important security fix, see below. For the full list of changes see the change logs at https://zope.readthedocs.io/en/4.x/changes.html#id1 and https://zope.readthedocs.io/en/latest/changes.html#id1

Installation instructions can be found at https://zope.readthedocs.io/en/4.x/INSTALL.html and https://zope.readthedocs.io/en/latest/INSTALL.html.

NOTE: These releases contain an expanded security fix that prevents remote code execution through TAL expressions. The first iteration of the security fix in Zope 4.6 and 5.2 did not catch all cases of unauthorized TAL path expression traversal. Just like the first fix, you will only ever be at risk if you allow untrusted users to add or edit Zope Page Template objects, which is a very unusual non-standard site configuration. For more details, see the security advisory at https://github.com/zopefoundation/Zope/security/advisories/GHSA-rpcg-f9q6-2mq6. A CVE has been requested through GitHub.

NOTE FOR PLONE USERS: Make sure to install the latest version of PloneHotfix20210518 first, which should appear shortly after this Zope release. See https://plone.org/security/hotfix/20210518. Don't install Zope 4.6.1 or 5.2.1 into an existing Plone setup without testing. The security changes in Zope break some Plone add-ons that relied on the old insecure traversal behavior. PloneHotfix20210518 ensures support for those Plone add-ons.

Jens Vagelpohl

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