A vulnerability has been found in the Zope Object Database (ZODB) Zope Enterprise Objects (ZEO) server implementation that allows any file readable by the server to be read by clients and any file removable by the server to be removed. The vulnerability only applies if - you are using ZEO to share a database among multiple applications or application instances, - you allow untrused clients to connect to your ZEO server, and - the ZEO server is configured to support blobs. The vulnerability was introduced in ZODB 3.8. Overview -------- This vulnerability is addressed by updates to ZODB. A new release of ZODB is available here: http://pypi.python.org/pypi/ZODB3/3.8.3 (There is also a new development release at http://pypi.python.org/pypi/ZODB3/3.9.0c2.) If you are using blobs, we recommend updating any ZEO storage servers you're running to ZODB 3.8.3 (or ZODB 3.9.0c2). These versions support ZEO clients as old as ZODB 3.2. It isn't necessary to update client software (such as Zope application servers). Restricting access to ZEO storage servers ----------------------------------------- It is very important to restrict write access to ZODB databases. These releases only protect against vulnerabilities in the ZEO network protocol. ZODB uses Python pickles to store data. Loading data from the database can cause arbitrary code to be executed as part of object deserialization. Clients have full access to manipulate database data. For this reason, it is very important that only trusted clients be allowed to write to ZODB databases. Jim -- Jim Fulton