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Vulnerabilities in PostgreSQL SET ROLE/SET SESSION AUTHORIZATION By issuing SET ROLE with a specially crafted argument, it is possible for any logged-in database user to acquire the privileges of any other database user, including superusers. Database superuser status allows access to the machine's filesystem and hence might be used to mount remote attacks against the rest of the server's operating system. This error exists in PostgreSQL releases 8.1.0 - 8.1.2 and is fixed in 8.1.3. The same underlying bug exists in SET SESSION AUTHORIZATION in all releases back to 7.3. This variant cannot be exploited for privilege escalation, because one must already be superuser to use SET SESSION AUTHORIZATION. However, if the server has been compiled with Asserts enabled (which is not the default), then it is possible to trigger an Assert failure before the privilege check is reached. This would cause a momentary denial of service to other database users. This is repaired in PostgreSQL releases 8.1.3, 8.0.7, 7.4.12, and 7.3.14. |
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