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Message from discussion VMS security vulnerability (POP server)
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m...@null.net  
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 More options Jul 2 2007, 11:50 am
Newsgroups: comp.os.vms
From: m...@null.net
Date: Mon, 02 Jul 2007 08:50:14 -0700
Local: Mon, Jul 2 2007 11:50 am
Subject: Re: VMS security vulnerability (POP server)
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On Jul 2, 2:00 am, JF Mezei <jfmezei.spam...@vaxination.ca> wrote:

> So by checking whether the USER command returns an -ERR or +OK, you can
> narrow down which usernames are valid, and then proceed to guess their
> passwords by brute force.

Yes, but that behavior is up to the system manager.  Messages
generated by the POP server can be either FRIENDLY or SECURE.  For
example, if you don't want a potential attacker to be able to tell
whether or not a particular username exists, you can do:

   $ DEFINE /SYSTEM /EXECUTIVE_MODE TCPIP$POP_SECURITY SECURE

Of course, you'll also want to make appropriate settings around other
ways to scan for valid usernames, such as SMTP, FINGER, FTP, and other
services you have enabled.  Otherwise, the attacker who wants to know
whether user JONES exists will just try sending mail and see whether
it bounces.

For the POP server, the source of all access attempts (whether
successful or not) is captured in the file:

   SYS$SYSDEVICE:[TCPIP$POP]TCPIP$POP_RUN.LOG

If the target username exists, the login failure count is also
incremented so that the user will be notified of the failures upon the
next valid login.

             - Mark


 
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