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Date: Fri, 7 Jun 2013 09:46:52 -0300
From: Felipe Pena <felipensp@...il.com>
To: oss-security@...ts.openwall.com
Subject: Broken authentication on Monkey HTTPD Auth plugin
I've found an issue in the way as Monkey HTTPD Auth login performs
authentication:
CVE-2013-2159 - Broken username checking on Auth plugin
Due strncmp() misuse the username checking phase was matching different
usernames when checking N initial bytes from username list.
$ ./mk_passwd -c -b ../plugins/auth/users.mk felipe123 bar
[+] Adding user felipe123
$ ./mk_passwd -b ../plugins/auth/users.mk felipe foo
[+] Adding user felipe
On this scenario, we only manage to log in with 'felipe' username using
'bar' as password, since the strncmp() was using the first 6 bytes to match
the usernames.
The bug has been fixed, more details at
http://bugs.monkey-project.com/ticket/183
--
Regards,
Felipe Pena
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