Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-svcb-https-05.txt

Joe Abley <jabley@hopcount.ca> Mon, 10 May 2021 10:08 UTC

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From: Joe Abley <jabley@hopcount.ca>
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Date: Mon, 10 May 2021 06:08:25 -0400
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To: Pieter Lexis <pieter.lexis@powerdns.com>
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Subject: Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-svcb-https-05.txt
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On May 10, 2021, at 05:42, Pieter Lexis <pieter.lexis@powerdns.com> wrote:

>> On 5/9/21 2:01 PM, Dick Franks wrote:
>> Pre-processing of '\\,' into the RFC1035 standard '\,' is
>> superficially attractive, but also fraught with danger.
>> 
>> A parser could have some fun with this one:
>> 
>>    $ORIGIN example.com
>>    @   SVCB   1 foo
>> key6="\032\001\013\184\000\000\000\000\000\000\000\000\\\\,\000"
>>    ; a.k.a.   ipv6hint=2001:db8::5c5c:2c00
> 
> A zone owner/editor would never even think of typing in IP addresses
> like that.

Right, but an attacker who wants to take advantage of the impact of that observation in the construction of some parser might, which is why it's a security concern. 


Joe