RE: DNS ACL ?

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Date: Sun, 13 Nov 2005 10:31:55 +0200
To: "John Hally" <JHally@epnet.com>, <pen-test@securityfocus.com>

Hi John,
Correct, 53/UDP is used for DNS Queries and 53/TCP is used for Zone
transfers yet it's not always like this
MS uses 53/TCP for queries as well, but mainly the UDP is used for
queries

Thanks
 

-----Original Message-----
From: John Hally [mailto:JHally@epnet.com]
Sent: Friday, November 11, 2005 3:35 PM
To: 'pen-test@securityfocus.com'
Subject: DNS ACL ?

Hello All,

I need a sanity check regarding DNS ACLs. For external facing DNS
servers you need to allow only udp/53 inbound, correct? I know tcp/53
is used for zone transfers and requests/replies greater than a certain
size, but they shouldn't typically happen for general dns queries
correct?

Thanks in advance!

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Hackers are concentrating their efforts on attacking applications on your
website. Up to 75% of cyber attacks are launched on shopping carts, forms,
login pages, dynamic content etc. Firewalls, SSL and locked-down servers are
futile against web application hacking. Check your website for vulnerabilities
to SQL injection, Cross site scripting and other web attacks before hackers do!
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• Previous message: Sam Johnson: "RE: Core Impact references"
• Maybe in reply to: John Hally: "DNS ACL ?"
• Next in thread: Jason Muskat: "RE: DNS ACL ?"
• Messages sorted by: [ date ] [ thread ] [ subject ] [ author ] [ attachment ]