CVE-2007-4769

El analizador de expresiones regulares en TCL versiones anteriores a 8.4.17, como es usado en PostgreSQL versiones 8.2 anteriores a 8.2.6,versiones 8.1 anteriores a 8.1.11, versiones 8.0 anteriores a 8.0.15 y versiones 7.4 anteriores a 7.4.19, permite a usuarios autenticados remotos causar una denegación de servicio (bloqueo del backend) por medio de un número backref fuera de límites.

Index Functions Privilege Escalation: 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. Regular Expression Denial-of-Service: 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. DBLink Privilege Escalation: 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 , but that patch failed to close all forms of the loophole.