Account Options

  1. Sign in
The old Google Groups will be going away soon, but your browser is incompatible with the new version.
Google Groups Home
« Groups Home
comp.os.vms
+ new post
About this group
Subscribe to this group
This is a Usenet group - learn more
Message from discussion VMS security vulnerability (POP server)
The group you are posting to is a Usenet group. Messages posted to this group will make your email address visible to anyone on the Internet.
Your reply message has not been sent.
Your post was successful
 
From:
To:
Cc:
Followup To:
Add Cc | Add Followup-to | Edit Subject
Subject:
Validation:
For verification purposes please type the characters you see in the picture below or the numbers you hear by clicking the accessibility icon. Listen and type the numbers you hear
 
davi...@alpha2.mdx.ac.uk  
View profile  
 More options Jul 3 2007, 9:18 am
Newsgroups: comp.os.vms
From: davi...@alpha2.mdx.ac.uk
Date: Tue, 3 Jul 2007 13:18:24 +0000 (UTC)
Local: Tues, Jul 3 2007 9:18 am
Subject: Re: VMS security vulnerability (POP server)
Print | View thread | Show original | Report this message | Find messages by this author

In article <op.tut97bj98vl...@murphus.linden>, "Tom Linden" <tom-rem...@kednos.com> writes:
>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 fro=
>m
>>> 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=3D110 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 ca=
>n  =

>> 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?

Telnet in this instance is just being used to setup a connection to the POP
server port and then to pass the same commands that a pop client would send.
Telnet is often used in this manner. The telnet connection could come from
anywhere and the only way to stop telnet connections to the POP server port
would basically be to stop anyone connecting to that port eg not to run the POP
server.

David Webb
Security team leader
CCSS
Middlesex University

>-- =

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


 
You must Sign in before you can post messages.
To post a message you must first join this group.
Please update your nickname on the subscription settings page before posting.
You do not have the permission required to post.
Create a group - Google Groups - Google Home - Terms of Service - Privacy Policy
©2012 Google