Important: New Plone hotfix; please patch your sites ASAP

The Plone Security team released a new hotfix this morning, "Plone 
Hotfix 20110531," addressing 4 vulnerabilities.  Please take the time as 
soon as possible to install this hotfix on any sites for which you are 
responsible.

Installation instructions for the hotfix can be found at 
http://plone.org/products/plone-hotfix/releases/20110531

The hotfix addresses the following 4 vulnerabilities:

1. Reflected XSS attack: A crafted URL can display arbitrary HTML 
output. This is a vulnerability in CMFPlone affecting all versions of 
Plone. Thanks to S. Streichsbier of SEC Consult for the responsible 
disclosure. See CVE-2011-1948 for details. 
http://plone.org/products/plone/security/advisories/CVE-2011-1948

2. Persistent XSS attack: Certain valid HTML will allow Javascript 
filtering to be bypassed. This is a vulnerability in 
Products.PortalTransforms affecting all versions of Plone using it, 
including 2.1 through 4.1. Thanks to Daniel Berlin and Dan Bentley both 
of Google and Brian Peters an independent researcher, for responsibly 
disclosing this independently of each other. See CVE-2011-1949 for 
details. http://plone.org/products/plone/security/advisories/CVE-2011-1949

3. Unauthorized data changes: One form allows users to edit the 
properties of other users. This is a vulnerability in plone.app.users 
affecting Plone 4.0 and 4.1. See CVE-2011-1950 for details. Please note: 
This vulnerability was disclosed prior to release of the hotfix, and it 
is highly recommended that site administrators and privileged users 
reset their passwords.  
http://plone.org/products/plone/security/advisories/CVE-2011-1950

4. Denial of service: A user can prevent other users from logging in. 
This is a vulnerability in Products.PluggableAuthService affecting all 
versions of Plone using it, including 2.5 through 4.1. Thanks to Alan 
Hoey of Team Rubber for the responsible disclosure. See PAS ticket 
#789858 for details. https://bugs.launchpad.net/zope-pas/+bug/789858

The hotfix is supported on Plone 3 and 4. It is also known to work on 
Plone 2.5, and may work on older versions of Plone. The fixes included 
will be incorporated into subsequent releases of Plone, so Plone 4.0.7, 
4.1rc3, and greater should not require this hotfix.

We would also appreciate your assistance in spreading word of this 
hotfix to other Plone site administrators who may not have gotten the 
word yet.

thanks,
David Glick
on behalf of the Plone Security team


----------		
David Glick
 Web Developer
 [email protected]
 206.286.1235x32

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