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Hotfix_2001-09-28
This is a "hotfix" product. Hotfix products can be installed to
incorporate modifications to Zope at runtime without requiring
an immediate installation upgrade. Hotfix products are installed
just as you would install any other Zope product.
This hotfix addresses an important security issue that affects Zope
versions 2.2.0 through 2.4.1.
The issue involves the "fmt" attribute of dtml-var tags. Without
this correction, Zope does not check security access to methods
invoked through "fmt". This issue could allow partially trusted
users with enough knowledge of Zope to call, in a limited way,
methods they would not otherwise be allowed to access.
We highly recommend that any Zope site running Zope 2.2.0 through Zope
2.4.1 have this hotfix product installed to mitigate the issue. Zope
2.4.2 will contain a fix for the issue, at which time the hotfix can
be removed.
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