Re: How easy is it to lose permissions in 'public' schema?

Adrian Klaver <adrian(dot)klaver(at)aklaver(dot)com> writes:
> On 4/11/22 16:10, Rob Sargent wrote:
>> I've just bumped into this.
>>
>> barnard=> select public.genome_threshold_mono('a'::text,'b'::text);
>> ERROR:  permission denied for schema public
>> LINE 1: select public.genome_threshold_mono('a'::text,'b'::text);
>>
>> I know I haven't intentionally removed 'public' from grantee's purview
>> and short of the code block above not actually getting run, any guesses
>> as to how access to 'public' got removed from grantee?

> I'm going to say someone read this:
> https://wiki.postgresql.org/wiki/A_Guide_to_CVE-2018-1058:_Protect_Your_Search_Path
> And did something along the line of this:
> REVOKE CREATE ON SCHEMA public FROM PUBLIC;

Note that that only recommends removing CREATE, though, not USAGE
which is what Rob seems to be lacking.

regards, tom lane