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README.txt

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Hotfix_2002-03-01

  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 may affect 
  some users of Zope versions 2.2.0 through 2.5.x

  The issue involves the checking of security for objects with proxy 
  roles. The context of the owner user that created the object with 
  proxy roles was not being taken into account when determining access 
  to the object with proxy roles. This flaw could allow users defined 
  in subfolders of a site with sufficient privileges to access objects 
  at higher levels in the site that they would not normally be able to 
  access.

  We highly recommend that any Zope site running Zope 2.2.0 through Zope
  2.5.x have this hotfix product installed to mitigate the issue. Zope
  2.5.1 and 2.4.4 will contain a fix for the issue, at which time the 
  hotfix can be removed.