Postgresql cleartext password storage

[rvdm () CISTRON NL (Robert van der Meulen)]

Hi,

While migrating some postgres databases to a different server (including
user accounts) i noticed the following problem in the way postgres stores
user passwords:

SmellyCat:/var/postgres/data# strings pg_shadow
someaccountname
someaccountpassword
anotheraccountname
anotheraccountpassword
SmellyCat:/var/postgres/data#

This means postgresql stores usernames and passwords, cleartext, in
pg_shadow.
pg_shadow (and the other administrative tables) are owned by user postgres,
and only readable by user postgres, although modifying them trough the pgsql
monitor is usually protected by a password.

The passwords being cleartext, and readable by user postgres (and root,
ofcourse), allows bypassing the password mechanism, and gives access to all
databases. (compromising user 'postgres' or reading the pg_shadow file gives
access to the usernames/passwords)

Ofcourse this came in handy for me, but i think it's not the way it should
be:)
I tested this on postgres versions 6.3.2 and 6.5.3 , others probably
experience this problem as well.

This message is mailed to bugtraq, and Cc'd to the postgresql developers.

Greets,
        Robert van der Meulen/Emphyrio

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