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Message from discussion VMS security vulnerability (POP server)
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JF Mezei  
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 More options Jul 2 2007, 2:00 am
Newsgroups: comp.os.vms
From: JF Mezei <jfmezei.spam...@vaxination.ca>
Date: Mon, 02 Jul 2007 02:00:44 -0400
Local: Mon, Jul 2 2007 2:00 am
Subject: Re: VMS security vulnerability (POP server)
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Michael Moroney wrote:
> That is a nasty one, since much of what makes VMS resistant to such
> attacks is the ability to sense a breakin attempt and deny access from
> the breakin source even when it gets the password correct.

> Did the attempt seem to target VMS or was it a script kiddie hacking at
> a Windoze box or Unix box (accounts like administrator or root being
> tried)

Brute force. And VMS is even worse:

$ telnet/port=110 chain
%TELNET-I-TRYING, Trying ... 10.0.0.11
%TELNET-I-SESSION, Session 01, host chain, port 110
+OK TCPIP POP server V5.6-9, OpenVMS V8.3 Alpha at chain.vaxination.ca,
up sinc>
USER canada
-ERR No such user "canada"
USER system
+OK Password required for "system"
PASS chocolate
-ERR password supplied for "system" is incorrect.
%TELNET-S-REMCLOSED, Remote connection closed
-TELNET-I-SESSION, Session 01, host chain, port 110

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.


 
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