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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
--
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-- Test extension script protection against search path overriding
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--
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CREATE ROLE regress_seg_role;
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SELECT current_database() AS datname \gset
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GRANT CREATE ON DATABASE :"datname" TO regress_seg_role;
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SET ROLE regress_seg_role;
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CREATE SCHEMA regress_seg_schema;
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CREATE FUNCTION regress_seg_schema.exfun(i int) RETURNS int AS $$
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BEGIN
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CREATE EXTENSION seg VERSION '1.2';
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CREATE FUNCTION regress_seg_schema.compare(oid, regclass) RETURNS boolean AS
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'BEGIN RAISE EXCEPTION ''overloaded compare() called by %'', current_user; END;' LANGUAGE plpgsql;
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CREATE OPERATOR = (LEFTARG = oid, RIGHTARG = regclass, PROCEDURE = regress_seg_schema.compare);
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ALTER EXTENSION seg UPDATE TO '1.3';
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RETURN i;
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END; $$ LANGUAGE plpgsql;
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CREATE SCHEMA test_schema
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CREATE TABLE t(i int) PARTITION BY RANGE (i)
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CREATE TABLE p1 PARTITION OF t FOR VALUES FROM (1) TO (regress_seg_schema.exfun(2));
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DROP SCHEMA test_schema CASCADE;
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RESET ROLE;
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DROP OWNED BY regress_seg_role;
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DROP ROLE regress_seg_role;
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