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Zope hotfix: ZPublisher security update
This hotfix addresses an important security issue that affects Zope versions 2.2.0, 2.2.1, and 2.2.2.
It is sometimes possible to access, through a URL only, objects protected by a role which the user has in some context, but not in the context of the accessed object.
Currently, the validate() method of all known user folder implementations validates against the users' roles in the context of PARENTS[0]. PARENTS[0] refers to the acquisition context of the object being published. All security checks, however, should check an object's containment, not its acquisition context.
validate(), therefore, needs to verify the user's roles in the context of the object being published. This hotfix forces that to occur by temporarily leaving the object at PARENTS[0] then removing it after validation has been performed.
Unfortunately, this is not an ideal correction. In the near future all user folder validate() implementations need to perform security checks using the new Zope security policy subsystem. Until that is completed, this hotfix should close the security problem.
While we know of no instances of this issue being used to exploit a site, we recommend that any Zope 2.2.x site that is accessible by untrusted clients have this hotfix product installed to mitigate the issue.
http://www.zope.org/Products/Zope/Hotfix_2000-10-02/Hotfix_2000-10-02.tar.gz
The hotfix will work for all versions of Zope 2.2.0 and higher. A future version of Zope will contain the fix for this issue, and you will be able to uninstall the hot fix after upgrading.