The libxslt support in contrib/xml2 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 does not properly restrict access to files and URLs, which allows remote authenticated users to modify data, obtain sensitive information, or trigger outbound traffic to arbitrary external hosts by leveraging (1) stylesheet commands that are permitted by the libxslt security options or (2) an xslt_process feature, related to an XML External Entity (aka XXE) issue.
https://bugzilla.redhat.com/show_bug.cgi?id=849172
https://blogs.oracle.com/sunsecurity/entry/multiple_vulnerabilities_in_postgresql2
http://www.ubuntu.com/usn/USN-1542-1
http://www.securityfocus.com/bid/55072
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.mandriva.com/security/advisories?name=MDVSA-2012:139
http://www.debian.org/security/2012/dsa-2534
http://secunia.com/advisories/50946
http://secunia.com/advisories/50859
http://secunia.com/advisories/50718
http://secunia.com/advisories/50636
http://secunia.com/advisories/50635
http://rhn.redhat.com/errata/RHSA-2012-1264.html
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
http://kb.juniper.net/InfoCenter/index?page=content&id=JSA10705