Arch Linux

Description: Five vulnerabilities deemed "critical" have been addressed in PostgreSQL. The fixed versions are 8.2.6, 8.1.11, 8.0.15, 7.4.19, 7.3.21.

Additional info:

Full details can be found here: http://www.postgresql.org/about/news.905

The following is an excerpt from the announcement which details the vulnerabilities themselves (CVE-2007-6600, CVE-2007-4772, CVE-2007-6067, CVE-2007-4769, CVE-2007-6601):

"""
Index Functions Privilege Escalation (CVE-2007-6600): as a unique feature, PostgreSQL allows users to create indexes on the results of user-defined functions, known as "expression indexes". This provided two vulnerabilities to privilege escalation: (1) index functions were executed as the superuser and not the table owner during VACUUM and ANALYZE, and (2) that SET ROLE and SET SESSION AUTHORIZATION were permitted within index functions. Both of these holes have now been closed.

Regular Expression Denial-of-Service (CVE-2007-4772, CVE-2007-6067, CVE-2007-4769): three separate issues in the regular expression libraries used by PostgreSQL allowed malicious users to initiate a denial-of-service by passing certain regular expressions in SQL queries. First, users could create infinite loops using some specific regular expressions. Second, certain complex regular expressions could consume excessive amounts of memory. Third, out-of-range backref numbers could be used to crash the backend. All of these issues have been patched.

DBLink Privilege Escalation (CVE-2007-6601): DBLink functions combined with local trust or ident authentication could be used by a malicious user to gain superuser privileges. This issue has been fixed, and does not affect users who have not installed DBLink (an optional module), or who are using password authentication for local access. This same problem was addressed in the previous release cycle (see CVE-2007-3278), but that patch failed to close all forms of the loophole.
"""