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.
https://bugzilla.redhat.com/show_bug.cgi?id=849173
https://blogs.oracle.com/sunsecurity/entry/multiple_vulnerabilities_in_postgresql2
http://www.ubuntu.com/usn/USN-1542-1
http://www.postgresql.org/support/security/
http://www.postgresql.org/docs/9.1/static/release-9-1-5.html
http://www.postgresql.org/docs/9.0/static/release-9-0-9.html
http://www.postgresql.org/docs/8.4/static/release-8-4-13.html
http://www.postgresql.org/docs/8.3/static/release-8-3-20.html
http://www.postgresql.org/about/news/1407/
http://www.debian.org/security/2012/dsa-2534
http://rhn.redhat.com/errata/RHSA-2012-1263.html
http://lists.opensuse.org/opensuse-updates/2012-10/msg00024.html
http://lists.opensuse.org/opensuse-updates/2012-10/msg00013.html
http://lists.opensuse.org/opensuse-updates/2012-09/msg00102.html
http://lists.apple.com/archives/security-announce/2013/Mar/msg00002.html