mirror of
https://github.com/postgres/postgres.git
synced 2025-10-31 10:30:33 +03:00
681d9e4621
The two methods don't cooperate, so set_config_option("search_path",
...) has been ineffective under non-empty overrideStack. This defect
enabled an attacker having database-level CREATE privilege to execute
arbitrary code as the bootstrap superuser. While that particular attack
requires v13+ for the trusted extension attribute, other attacks are
feasible in all supported versions.
Standardize on the combination of NewGUCNestLevel() and
set_config_option("search_path", ...). It is newer than
PushOverrideSearchPath(), more-prevalent, and has no known
disadvantages. The "override" mechanism remains for now, for
compatibility with out-of-tree code. Users should update such code,
which likely suffers from the same sort of vulnerability closed here.
Back-patch to v11 (all supported versions).
Alexander Lakhin. Reported by Alexander Lakhin.
Security: CVE-2023-2454
33 lines
999 B
PL/PgSQL
33 lines
999 B
PL/PgSQL
--
|
|
-- Test extension script protection against search path overriding
|
|
--
|
|
|
|
CREATE ROLE regress_seg_role;
|
|
SELECT current_database() AS datname \gset
|
|
GRANT CREATE ON DATABASE :"datname" TO regress_seg_role;
|
|
SET ROLE regress_seg_role;
|
|
CREATE SCHEMA regress_seg_schema;
|
|
|
|
CREATE FUNCTION regress_seg_schema.exfun(i int) RETURNS int AS $$
|
|
BEGIN
|
|
CREATE EXTENSION seg VERSION '1.2';
|
|
|
|
CREATE FUNCTION regress_seg_schema.compare(oid, regclass) RETURNS boolean AS
|
|
'BEGIN RAISE EXCEPTION ''overloaded compare() called by %'', current_user; END;' LANGUAGE plpgsql;
|
|
|
|
CREATE OPERATOR = (LEFTARG = oid, RIGHTARG = regclass, PROCEDURE = regress_seg_schema.compare);
|
|
|
|
ALTER EXTENSION seg UPDATE TO '1.3';
|
|
|
|
RETURN i;
|
|
END; $$ LANGUAGE plpgsql;
|
|
|
|
CREATE SCHEMA test_schema
|
|
CREATE TABLE t(i int) PARTITION BY RANGE (i)
|
|
CREATE TABLE p1 PARTITION OF t FOR VALUES FROM (1) TO (regress_seg_schema.exfun(2));
|
|
|
|
DROP SCHEMA test_schema CASCADE;
|
|
RESET ROLE;
|
|
DROP OWNED BY regress_seg_role;
|
|
DROP ROLE regress_seg_role;
|