Author: Tom Lane <tgl@sss.pgh.pa.us>

Branch: master [7eeb1d986] 2020-08-10 10:44:42 -0400

Branch: REL_13_STABLE [98ca64899] 2020-08-10 10:44:42 -0400

Branch: REL_12_STABLE [3ba967084] 2020-08-10 10:44:42 -0400

Branch: REL_11_STABLE [afa358786] 2020-08-10 10:44:43 -0400

Branch: REL_10_STABLE [96cbfe92d] 2020-08-10 10:44:43 -0400

Branch: REL9_6_STABLE [2ea8a60fc] 2020-08-10 10:44:43 -0400

Branch: REL9_5_STABLE [6b11a4687] 2020-08-10 10:44:43 -0400

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<para>

Make contrib modules' installation scripts more secure (Tom Lane)

</para>

<para>

Attacks similar to those described in CVE-2018-1058 could be carried

out against an extension installation script, if the attacker can

create objects in either the extension's target schema or the schema

of some prerequisite extension. Since extensions often require

superuser privilege to install, this can open a path to obtaining

superuser privilege. To mitigate this risk, be more careful about

the <varname>search_path</varname> used to run an installation

script; disable <varname>check_function_bodies</varname> within the

script; and fix catalog-adjustment queries used in some contrib

modules to ensure they are secure. Also provide documentation to

help third-party extension authors make their installation scripts

secure. This is not a complete solution; extensions that depend on

other extensions can still be at risk if installed carelessly.

(CVE-2020-14350)

</para>

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