Ethical Hacking Learn to find vulnerabilities before the bad guys do! Gain real world hands on hacking experience in our state of the art hacking lab. Course designed and taught by expert instructors with years of penetration testing experience. 12 student maximum in every class. Certification attempt included in every package. | Computer Forensics Training at InfoSec Institute Gain the in-demand skills of a certified computer examiner, learn to recover trace data left behind by fraud, theft, and cybercrime perpetrators. Discover the source of computer crime and abuse at your organization so that it never happens again. All of our class sizes are guaranteed to be 12 students or less to facilitate one-on-one interaction with one of our expert instructors. |

| Subject: | Re: ESMTP service |
|---|---|
| Date: | Thu, 27 Dec 2007 12:55:01 +0100 |
On 2007-12-25 Sun Z wrote:
One security issue would be that the SMTP service has commands to ennumerate users of the machine
Wrong. SMTP provides commands to verify (not enumerate) a given address, or to expand a given mailing list address to its members. In any case you are dealing with mailboxes, not users. Mailboxes don't necessarily represent user accounts on that machine. The VRFY command can be turned off on most SMTP servers, too.
which can be used in brute force attempts, FTP and SSH for example.
FTP should've died a long time ago, and there are better ways to secure SSH from brute force attacks than hiding login names. Public key authentication comes to mind. Besides, users' login names can usually be guessed most easily anyway, so they shouldn't be considered a secret in the first place. Regards Ansgar Wiechers -- "All vulnerabilities deserve a public fear period prior to patches becoming available." --Jason Coombs on Bugtraq
| <Prev in Thread] | Current Thread | [Next in Thread> |
|---|---|---|
| ||
| Previous by Date: | RE: Sans GCFW - What about the "OnDemand" training version ?, Barbara L. Filkins |
|---|---|
| Next by Date: | Reflexive firewalls?, Ong Chin Kiat |
| Previous by Thread: | Re: ESMTP service, Sun Z |
| Next by Thread: | best Web application security Cert?, Mosab Sharairy |
| Indexes: | [Date] [Thread] [Top] [All Lists] |