From 3db38b0ceffd95be81573c884f4be21f79ca954a Mon Sep 17 00:00:00 2001 From: Noah Misch Date: Mon, 26 Feb 2018 07:39:44 -0800 Subject: Empty search_path in Autovacuum and non-psql/pgbench clients. This makes the client programs behave as documented regardless of the connect-time search_path and regardless of user-created objects. Today, a malicious user with CREATE permission on a search_path schema can take control of certain of these clients' queries and invoke arbitrary SQL functions under the client identity, often a superuser. This is exploitable in the default configuration, where all users have CREATE privilege on schema "public". This changes behavior of user-defined code stored in the database, like pg_index.indexprs and pg_extension_config_dump(). If they reach code bearing unqualified names, "does not exist" or "no schema has been selected to create in" errors might appear. Users may fix such errors by schema-qualifying affected names. After upgrading, consider watching server logs for these errors. The --table arguments of src/bin/scripts clients have been lax; for example, "vacuumdb -Zt pg_am\;CHECKPOINT" performed a checkpoint. That now fails, but for now, "vacuumdb -Zt 'pg_am(amname);CHECKPOINT'" still performs a checkpoint. Back-patch to 9.3 (all supported versions). Reviewed by Tom Lane, though this fix strategy was not his first choice. Reported by Arseniy Sharoglazov. Security: CVE-2018-1058 --- src/tools/findoidjoins/findoidjoins.c | 9 +++++++++ 1 file changed, 9 insertions(+) (limited to 'src/tools/findoidjoins/findoidjoins.c') diff --git a/src/tools/findoidjoins/findoidjoins.c b/src/tools/findoidjoins/findoidjoins.c index b9818d9f316..79691bdd82f 100644 --- a/src/tools/findoidjoins/findoidjoins.c +++ b/src/tools/findoidjoins/findoidjoins.c @@ -7,6 +7,7 @@ */ #include "postgres_fe.h" +#include "fe_utils/connect.h" #include "libpq-fe.h" #include "pqexpbuffer.h" @@ -44,6 +45,14 @@ main(int argc, char **argv) exit(EXIT_FAILURE); } + res = PQexec(conn, ALWAYS_SECURE_SEARCH_PATH_SQL); + if (!res || PQresultStatus(res) != PGRES_TUPLES_OK) + { + fprintf(stderr, "sql error: %s\n", PQerrorMessage(conn)); + exit(EXIT_FAILURE); + } + PQclear(res); + /* Get a list of relations that have OIDs */ printfPQExpBuffer(&sql, "%s", -- cgit v1.2.3