|The xml_parse function in the libxml2 support in the core server
component in PostgreSQL 8.3 before 8.3.20, 8.4 before 8.4.13, 9.0
before 9.0.9, and 9.1 before 9.1.5 allows remote authenticated users
to determine the existence of arbitrary files or URLs, and possibly
obtain file or URL content that triggers a parsing error, via an XML
value that refers to (1) a DTD or (2) an entity, related to an XML
External Entity (aka XXE) issue.