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Fix buffer overrun after incomplete read in pullf_read_max(). 

Most callers pass a stack buffer.  The ensuing stack smash can crash the
server, and we have not ruled out the viability of attacks that lead to
privilege escalation.  Back-patch to 9.0 (all supported versions).

Marko Tiikkaja

Security: CVE-2015-0243
This commit is contained in:
Noah Misch 2015-02-02 10:00:45 -05:00
parent 29725b3db6
commit 1dc7551586
4 changed files with 54 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
contrib/pgcrypto/expected/pgp-info.out
View File

@ -74,5 +74,6 @@ from encdata order by id;
2C226E1FFE5CC7D4
B68504FD128E1FF9
FD0206C409B74875
(4 rows)
FD0206C409B74875
(5 rows)

25
contrib/pgcrypto/expected/pgp-pubkey-decrypt.out
View File

@ -564,6 +564,27 @@ GQ==
=XHkF
-----END PGP MESSAGE-----
');
-- rsaenc2048 / aes128 (not from gnupg)
insert into encdata (id, data) values (5, '
-----BEGIN PGP MESSAGE-----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=
=PHJ1
-----END PGP MESSAGE-----
');
-- successful decrypt
select pgp_pub_decrypt(dearmor(data), dearmor(seckey))
from keytbl, encdata where keytbl.id=1 and encdata.id=1;
@ -629,3 +650,7 @@ from keytbl, encdata where keytbl.id=5 and encdata.id=1;
Secret msg
(1 row)
-- test for a short read from prefix_init
select pgp_pub_decrypt(dearmor(data), dearmor(seckey))
from keytbl, encdata where keytbl.id=6 and encdata.id=5;
ERROR: Wrong key or corrupt data

1
contrib/pgcrypto/mbuf.c
View File

@ -305,6 +305,7 @@ pullf_read_max(PullFilter *pf, int len, uint8 **data_p, uint8 *tmpbuf)
break;
memcpy(tmpbuf + total, tmp, res);
total += res;
len -= res;
}
return total;
}

26
contrib/pgcrypto/sql/pgp-pubkey-decrypt.sql
View File

@ -579,6 +579,28 @@ GQ==
-----END PGP MESSAGE-----
');
-- rsaenc2048 / aes128 (not from gnupg)
insert into encdata (id, data) values (5, '
-----BEGIN PGP MESSAGE-----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=
=PHJ1
-----END PGP MESSAGE-----
');
-- successful decrypt
select pgp_pub_decrypt(dearmor(data), dearmor(seckey))
from keytbl, encdata where keytbl.id=1 and encdata.id=1;
@ -619,3 +641,7 @@ from keytbl, encdata where keytbl.id=5 and encdata.id=1;
-- password-protected secret key, right password
select pgp_pub_decrypt(dearmor(data), dearmor(seckey), 'parool')
from keytbl, encdata where keytbl.id=5 and encdata.id=1;
-- test for a short read from prefix_init
select pgp_pub_decrypt(dearmor(data), dearmor(seckey))
from keytbl, encdata where keytbl.id=6 and encdata.id=5;