[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Another SQL injection in ProFTPd with mod_mysql (probably postgres as well)
- To: bugtraq@xxxxxxxxxxxxxxxxx
- Subject: Another SQL injection in ProFTPd with mod_mysql (probably postgres as well)
- From: gat3way@xxxxxxxxxx
- Date: 10 Feb 2009 19:49:53 -0000
Hello,
Just found out a problem with proftpd's sql authentication. The problem is
easily reproducible if you login with username like:
USER %') and 1=2 union select 1,1,uid,gid,homedir,shell from users; --
and a password of "1" (without quotes).
which leads to a successful login. Different account logins can be made
successful using the limit clase (e.g appending "LIMIT 5,1" will make you login
with as the 5th account in the users table).
As far as I can see in the mysql logs the query becomes:
SELECT userid, passwd, uid, gid, homedir, shell FROM users WHERE
(userid='{UNKNOWN TAG}') and 1=2 union select 1,1,uid,gid,homedir,shell from
users limit 1,1; -- ') LIMIT 1
I think the problem lies in the handling of the "%" character (probably that's
some way to sanitize input to avoid format string things?).
Anyway, %' effectively makes the single quote unescaped and that eventually
allows for an SQL injection during login.