PostgreSQL 9.2.x before 9.2.4 and 9.1.x before 9.1.9 does not properly check REPLICATION privileges, which allows remote authenticated users to bypass intended backup restrictions by calling the (1) pg_start_backup or (2) pg_stop_backup functions.
http://www.ubuntu.com/usn/USN-1789-1
http://www.postgresql.org/docs/current/static/release-9-2-4.html
http://www.postgresql.org/docs/current/static/release-9-1-9.html
http://www.postgresql.org/about/news/1456/
http://www.mandriva.com/security/advisories?name=MDVSA-2013:142
http://www.debian.org/security/2013/dsa-2658
http://support.apple.com/kb/HT5892
http://support.apple.com/kb/HT5880
http://lists.opensuse.org/opensuse-security-announce/2013-04/msg00012.html
http://lists.opensuse.org/opensuse-security-announce/2013-04/msg00011.html
http://lists.opensuse.org/opensuse-security-announce/2013-04/msg00008.html
http://lists.opensuse.org/opensuse-security-announce/2013-04/msg00007.html
http://lists.fedoraproject.org/pipermail/package-announce/2013-April/102806.html
http://lists.fedoraproject.org/pipermail/package-announce/2013-April/101519.html
http://lists.apple.com/archives/security-announce/2013/Sep/msg00004.html
http://lists.apple.com/archives/security-announce/2013/Sep/msg00002.html