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Message from discussion VMS security vulnerability (POP server)
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Tom Linden  
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 More options Jul 2 2007, 9:24 am
Newsgroups: comp.os.vms
From: "Tom Linden" <tom-rem...@kednos.com>
Date: Mon, 02 Jul 2007 06:24:37 -0700
Local: Mon, Jul 2 2007 9:24 am
Subject: Re: VMS security vulnerability (POP server)
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On Sun, 01 Jul 2007 23:00:44 -0700, JF Mezei  

<jfmezei.spam...@vaxination.ca> wrote:
> 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.

What happens if you disable telnet and only allow ssh?

--
PL/I for OpenVMS
www.kednos.com


 
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