Updated postgresql packages that fix several security issues are now
available for Red Hat Enterprise Linux 4 and 5.
This update has been rated as having moderate security impact by the Red
Hat Security Response Team.
PostgreSQL is an advanced Object-Relational database management system
(DBMS). The postgresql packages include the client programs and libraries
needed to access a PostgreSQL DBMS server.
Will Drewry discovered multiple flaws in PostgreSQL's regular expression
engine. An authenticated attacker could use these flaws to cause a denial
of service by causing the PostgreSQL server to crash, enter an infinite
loop, or use extensive CPU and memory resources while processing queries
containing specially crafted regular expressions. Applications that accept
regular expressions from untrusted sources may expose this problem to
unauthorized attackers. (CVE-2007-4769, CVE-2007-4772, CVE-2007-6067)
A privilege escalation flaw was discovered in PostgreSQL. An authenticated
attacker could create an index function that would be executed with
administrator privileges during database maintenance tasks, such as
database vacuuming. (CVE-2007-6600)
A privilege escalation flaw was discovered in PostgreSQL's Database Link
library (dblink). An authenticated attacker could use dblink to possibly
escalate privileges on systems with "trust" or "ident" authentication
configured. Please note that dblink functionality is not enabled by
default, and can only by enabled by a database administrator on systems
with the postgresql-contrib package installed. (CVE-2007-3278,
All postgresql users should upgrade to these updated packages, which
include PostgreSQL 7.4.19 and 8.1.11, and resolve these issues.