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Check for CREATE privilege on the schema in CREATE STATISTICS.

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This omission allowed table owners to create statistics in any
schema, potentially leading to unexpected naming conflicts.  For
ALTER TABLE commands that require re-creating statistics objects,
skip this check in case the user has since lost CREATE on the
schema.  The addition of a second parameter to CreateStatistics()
breaks ABI compatibility, but we are unaware of any impacted
third-party code.

Reported-by: Jelte Fennema-Nio <postgres@jeltef.nl>
Author: Jelte Fennema-Nio <postgres@jeltef.nl>
Co-authored-by: Nathan Bossart <nathandbossart@gmail.com>
Reviewed-by: Noah Misch <noah@leadboat.com>
Reviewed-by: Álvaro Herrera <alvherre@kurilemu.de>
Security: CVE-2025-12817
Backpatch-through: 13
This commit is contained in:
Nathan Bossart
2025-11-10 09:00:00 -06:00
parent d6f0c0d6d6
commit 8a2530ebcd
3 changed files with 35 additions and 0 deletions
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8
src/backend/commands/statscmds.c
View File

@@ -33,6 +33,7 @@
#include "utils/builtins.h"
#include "utils/fmgroids.h"
#include "utils/inval.h"
#include "utils/lsyscache.h"
#include "utils/memutils.h"
#include "utils/rel.h"
#include "utils/syscache.h"
@@ -89,6 +90,7 @@ CreateStatistics(CreateStatsStmt *stmt)
bool requested_type = false;
int i;
ListCell *cell;
AclResult aclresult;
Assert(IsA(stmt, CreateStatsStmt));
@@ -167,6 +169,12 @@ CreateStatistics(CreateStatsStmt *stmt)
}
namestrcpy(&stxname, namestr);
/* Check we have creation rights in target namespace. */
aclresult = pg_namespace_aclcheck(namespaceId, GetUserId(), ACL_CREATE);
if (aclresult != ACLCHECK_OK)
aclcheck_error(aclresult, OBJECT_SCHEMA,
get_namespace_name(namespaceId));
/*
* Deal with the possibility that the statistics object already exists.
*/

14
src/test/regress/expected/stats_ext.out
View File

@@ -1745,6 +1745,18 @@ SELECT * FROM tststats.priv_test_parent_tbl t
(0 rows)
DELETE FROM tststats.priv_test_parent_tbl WHERE a <<< 0 AND b <<< 0; -- Should not leak
-- CREATE STATISTICS checks for CREATE on the schema
RESET SESSION AUTHORIZATION;
CREATE SCHEMA sts_sch1 CREATE TABLE sts_sch1.tbl (a INT, b INT);
GRANT USAGE ON SCHEMA sts_sch1 TO regress_stats_user1;
ALTER TABLE sts_sch1.tbl OWNER TO regress_stats_user1;
SET SESSION AUTHORIZATION regress_stats_user1;
CREATE STATISTICS sts_sch1.fail ON a, b FROM sts_sch1.tbl;
ERROR: permission denied for schema sts_sch1
RESET SESSION AUTHORIZATION;
GRANT CREATE ON SCHEMA sts_sch1 TO regress_stats_user1;
SET SESSION AUTHORIZATION regress_stats_user1;
CREATE STATISTICS sts_sch1.pass ON a, b FROM sts_sch1.tbl;
-- Tidy up
DROP OPERATOR <<< (int, int);
DROP FUNCTION op_leak(int, int);
@@ -1756,4 +1768,6 @@ NOTICE: drop cascades to 3 other objects
DETAIL: drop cascades to table tststats.priv_test_parent_tbl
drop cascades to table tststats.priv_test_tbl
drop cascades to view tststats.priv_test_view
DROP SCHEMA sts_sch1 CASCADE;
NOTICE: drop cascades to table sts_sch1.tbl
DROP USER regress_stats_user1;

13
src/test/regress/sql/stats_ext.sql
View File

@@ -963,6 +963,18 @@ SELECT * FROM tststats.priv_test_parent_tbl t
WHERE a <<< 0 AND (b <<< 0 OR t.* <<< (1, 1) IS NOT NULL); -- Should not leak
DELETE FROM tststats.priv_test_parent_tbl WHERE a <<< 0 AND b <<< 0; -- Should not leak
-- CREATE STATISTICS checks for CREATE on the schema
RESET SESSION AUTHORIZATION;
CREATE SCHEMA sts_sch1 CREATE TABLE sts_sch1.tbl (a INT, b INT);
GRANT USAGE ON SCHEMA sts_sch1 TO regress_stats_user1;
ALTER TABLE sts_sch1.tbl OWNER TO regress_stats_user1;
SET SESSION AUTHORIZATION regress_stats_user1;
CREATE STATISTICS sts_sch1.fail ON a, b FROM sts_sch1.tbl;
RESET SESSION AUTHORIZATION;
GRANT CREATE ON SCHEMA sts_sch1 TO regress_stats_user1;
SET SESSION AUTHORIZATION regress_stats_user1;
CREATE STATISTICS sts_sch1.pass ON a, b FROM sts_sch1.tbl;
-- Tidy up
DROP OPERATOR <<< (int, int);
DROP FUNCTION op_leak(int, int);
@@ -970,4 +982,5 @@ DROP OPERATOR <<< (record, record);
DROP FUNCTION op_leak(record, record);
RESET SESSION AUTHORIZATION;
DROP SCHEMA tststats CASCADE;
DROP SCHEMA sts_sch1 CASCADE;
DROP USER regress_stats_user1;