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Message from discussion VMS security vulnerability (POP server)
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Chris Sharman  
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 More options Jul 2 2007, 3:16 am
Newsgroups: comp.os.vms
From: Chris Sharman <chris.shar...@sorry.nospam>
Date: Mon, 02 Jul 2007 07:16:41 GMT
Local: Mon, Jul 2 2007 3:16 am
Subject: Re: VMS security vulnerability (POP server)
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JF Mezei wrote:
> 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.

Good job IUPOP3 does intrusion detection, and is easily available &
installable - I'd often wondered whether I ought to ditch it in favour
of the latest ucx/tcpip offering, but hadn't got around to it.

You make a convincing case for IUPOP3. It's source code, too, so if it
allows checking of user names in isolation, that would be easily fixable.

Chris


 
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