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pgcrypto: Detect and report too-short crypt() salts.

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Certain short salts crashed the backend or disclosed a few bytes of
backend memory.  For existing salt-induced error conditions, emit a
message saying as much.  Back-patch to 9.0 (all supported versions).

Josh Kupershmidt

Security: CVE-2015-5288
This commit is contained in:
Noah Misch
2015-10-05 10:06:29 -04:00
parent 2ca9d5445c
commit 1d812c8b05
9 changed files with 103 additions and 6 deletions
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4
contrib/pgcrypto/expected/crypt-des.out
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@ -13,6 +13,10 @@ SELECT crypt('foox', 'NB');
NB53EGGqrrb5E
(1 row)
-- We are supposed to pass in a 2-character salt.
-- error since salt is too short:
SELECT crypt('password', 'a');
ERROR: invalid salt
CREATE TABLE ctest (data text, res text, salt text);
INSERT INTO ctest VALUES ('password', '', '');
UPDATE ctest SET salt = gen_salt('des');