The SimpleXMLRPCServer library module in Python 2.2, 2.3 before 2.3.5, and 2.4, when used by XML-RPC servers that use the register_instance method to register an object without a _dispatch method, allows remote attackers to read or modify globals of the associated module, and possibly execute arbitrary code, via dotted attributes.
http://marc.info/?l=bugtraq&m=110746469728728&w=2
http://secunia.com/advisories/14128
http://securitytracker.com/id?1013083
https://exchange.xforce.ibmcloud.com/vulnerabilities/19217
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A9811
http://www.debian.org/security/2005/dsa-666
http://www.mandriva.com/security/advisories?name=MDKSA-2005:035