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Replace last PushOverrideSearchPath() call with set_config_option().

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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
This commit is contained in:
Noah Misch
2023-05-08 06:14:07 -07:00
parent 76a3e1d7a8
commit 01e8182c73
7 changed files with 165 additions and 11 deletions
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contrib/seg/Makefile
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@@ -13,7 +13,7 @@ PGFILEDESC = "seg - line segment data type"
HEADERS = segdata.h
REGRESS = seg
REGRESS = security seg
EXTRA_CLEAN = y.tab.c y.tab.h