Re: Blocking port 135?

["Crist Clark" <crist.clark () globalstar com>]

Bob German wrote:
> Absolutely.  All of the NetBIOS ports: 135, 137, 138, 139, 445.

Although the public exploits floating around (at the moment) attack
135/tcp, 135/udp is also vulnerable...

And for this crowd, I should point out that blocking 135/udp blocks
DCE-RPC which is used rather heavily by HP OpenView by default.

You may hear some shrieks of pain should you chose to block 135/udp.

Oh, and according to the guys who broke the story in the first place,

  http://www.securityfocus.com/archive/1/329918

Port 593/tcp is also potentially problematic.

> -----Original Message-----
> From: owner-nanog () merit edu [mailto:owner-nanog () merit edu] On Behalf Of
> Adi Linden
> Sent: Friday, August 01, 2003 2:37 PM
> To: nanog () merit edu
> Subject: Blocking port 135?
>
> http://www.cert.org/advisories/CA-2003-19.html
>
> Would blocking port 135 at the network edge be a prudent preventative
> measure?


-- 
Crist J. Clark                               crist.clark () globalstar com
Globalstar Communications                                (408) 933-4387

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