30th September 2021: PostgreSQL 14 Released!

CVE-2019-10208

TYPE in pg_temp executes arbitrary SQL during SECURITY DEFINER execution

Given a suitable SECURITY DEFINER function, an attacker can execute arbitrary SQL under the identity of the function owner. An attack requires EXECUTE permission on the function, which must itself contain a function call having inexact argument type match. For example, length('foo'::varchar) and length('foo') are inexact, while length('foo'::text) is exact.

As part of exploiting this vulnerability, the attacker uses CREATE DOMAIN to create a type in a pg_temp schema. The attack pattern and fix are similar to that for CVE-2007-2138.

Writing SECURITY DEFINER functions continues to require following the considerations noted in the documentation:

https://www.postgresql.org/docs/current/sql-createfunction.html#SQL-CREATEFUNCTION-SECURITY

The PostgreSQL project thanks Tom Lane for reporting this problem.

Version Information

Affected Version Fixed In Fix Published
11 11.5 2019-08-08
10 10.10 2019-08-08
9.6 9.6.15 2019-08-08
9.5 9.5.19 2019-08-08
9.4 9.4.24 2019-08-08

For more information about PostgreSQL versioning, please visit the versioning page.

CVSS 3.0

Overall Score 7.5
Component core server
Vector AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

Reporting Security Vulnerabilities

If you wish to report a new security vulnerability in PostgreSQL, please send an email to security@postgresql.org.

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