Re: SMTP service on Cisco VPN Concentrator

[Dirk Wetter <spam () drwetter org>]

Hi,

I don't know about those ports on the VPN concentrators but
if you don't know whether it's a false alarm and don't have access
to the system either, best is to use tcpdump/(t)ethereal while you
netcat/telnet to the port. If you get no TCP packet back the it's
very likely a false positive.


Cheers,

    Dirk


Rick Zhong wrote:
> Hi,
> I was carrying out a pen-test on a Cisco VPN Concentrator (3000),
> nessus 3.0 scan discovered a number of mail-related ports such as SMTP
> at 988, imaps at 993 and https at 443.  I try to telnet to the port
> 988 to verify but cannot get anything even a banner.
>
> Initially i considered this as false positive, but after some search
> on google,  it seems Cisco VPN Concentrator do has some smtp proxy at
> port 988 and imaps services.   I cannot find any other traces of these
> smtp ports besides the nessus report.
>
> Is there anyone has more information on these smtp proxy services on
> Cisco VPN concentrator (3000)? Any known security issues with these
> services on? Thanks.
>
> regards,
> Rick Zhong
>
> www.sinfosec.org
> www.security.org.sg


-- 
Dirk Wetter, Dr. Wetter IT-Consulting
IT-Security + Open Source                        http://drwetter.org
Key fingerprint = 2AD6 BE0F 9863 C82D 21B3  64E5 C967 34D8 11B7 C62F


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