[EXTERNAL] Re: Help with removing DNS shinkhole FP from Charter/Spectrum

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Thank you, Jim. Who is the vendor responsible?

Kenneth

On Tue, Apr 23, 2024 at 4:24 PM Rampley, Jim F <jim.rampley at charter.com>
wrote:

>
>
> Hi Kenneth,
>
>
>
> We have been working internally and with our third-party domain reputation
> source to get your domain removed from their malware list.
>
>
>
> Jim
>
>
>
> *From: *NANOG <nanog-bounces+jim.rampley=charter.com at nanog.org> on behalf
> of Validin Axon <axon at validin.com>
> *Date: *Tuesday, April 23, 2024 at 2:15 PM
> *To: *Tom Beecher <beecher at beecher.cc>
> *Cc: *NANOG <nanog at nanog.org>
> *Subject: *[EXTERNAL] Re: Help with removing DNS shinkhole FP from
> Charter/Spectrum
>
>
>
> CAUTION: The e-mail below is from an external source. Please exercise
> caution before opening attachments, clicking links, or following guidance.
>
>
>
> Tom,
>
>
>
> Thank you for this! It is very interesting that the behavior is
> intermittent. A friend of mine who tested it this weekend saw correct
> answers on IPv6 and incorrect answers on IPv4.
>
>
>
> Kenneth
>
>
>
> On Tue, Apr 23, 2024 at 2:56 PM Tom Beecher <beecher at beecher.cc> wrote:
>
> Validin, made an interesting observation on this. I am also a Spectrum
> residential customer,  none of their equipment, run my own DNS server
> (pihole).
>
>
>
> My DHCP Assigned DNS servers are
>
> 2001:1998:f00:1::1
> 2001:1998:f00:2::1
>
> bash-3.2$ dig -x 2001:1998:f00:1::1 +short
> dns-cac-lb-01.rr.com.
> bash-3.2$ dig -x 2001:1998:f00:2::1 +short
> dns-cac-lb-02.rr.com.
> bash-3.2$
>
>
> bash-3.2$ dig dns-cac-lb-01.rr.com +short
> 209.18.47.61
> bash-3.2$ dig dns-cac-lb-02.rr.com +short
> 209.18.47.62
> bash-3.2$
>
> bash-3.2$ dig @209.18.47.61 validin.com +short
> 157.245.112.183
> 137.184.54.107
> bash-3.2$ dig @209.18.47.62 validin.com +short
> 157.245.112.183
> 137.184.54.107
> bash-3.2$
>
> bash-3.2$ dig @2001:1998:f00:1::1 validin.com +short
> 127.0.0.54
> bash-3.2$
>
> bash-3.2$ dig @2001:1998:f00:2::1 validin.com +short
> 127.0.0.54
> bash-3.2$
>
> Same servers on V4 were returning correct info, but on V6 were not.
>
> However, a few minutes later :
>
> bash-3.2$ dig @2001:1998:f00:1::1 validin.com +short
> 157.245.112.183
> 137.184.54.107
> bash-3.2$ dig @2001:1998:f00:2::1 validin.com +short
> 157.245.112.183
> 137.184.54.107
> bash-3.2$
>
> Deltas :
>
> bash-3.2$ dig @2001:1998:f00:1::1  validin.com
>
> ; <<>> DiG 9.10.6 <<>> @2001:1998:f00:1::1 validin.com
> ; (1 server found)
> ;; global options: +cmd
> ;; Got answer:
> ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 42329
> ;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 0
>
> ;; QUESTION SECTION:
> ;validin.com.                   IN      A
>
> ;; ANSWER SECTION:
> validin.com.            60      IN      A       127.0.0.54
>
> ;; Query time: 37 msec
> ;; SERVER: 2001:1998:f00:1::1#53(2001:1998:f00:1::1)
> ;; WHEN: Tue Apr 23 13:50:03 EDT 2024
> ;; MSG SIZE  rcvd: 45
>
> bash-3.2$
>
> bash-3.2$ dig @2001:1998:f00:1::1 validin.com
>
> ; <<>> DiG 9.10.6 <<>> @2001:1998:f00:1::1 validin.com
> ; (1 server found)
> ;; global options: +cmd
> ;; Got answer:
> ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 9667
> ;; flags: qr rd ra; QUERY: 1, ANSWER: 2, AUTHORITY: 0, ADDITIONAL: 1
>
> ;; OPT PSEUDOSECTION:
> ; EDNS: version: 0, flags:; udp: 512
> ;; QUESTION SECTION:
> ;validin.com.                   IN      A
>
> ;; ANSWER SECTION:
> validin.com.            600     IN      A       157.245.112.183
> validin.com.            600     IN      A       137.184.54.107
>
> ;; Query time: 157 msec
> ;; SERVER: 2001:1998:f00:1::1#53(2001:1998:f00:1::1)
> ;; WHEN: Tue Apr 23 14:19:20 EDT 2024
> ;; MSG SIZE  rcvd: 72
>
> bash-3.2$
>
>
>
> Seems like quite possibly they are intermittently caching bunk data from
> something.
>
>
>
>
>
> On Tue, Apr 23, 2024 at 1:39 PM Validin Axon <axon at validin.com> wrote:
>
> Hi Jason,
>
>
>
> > I suspect what’s happened is an incorrect assumption that DNS is even
> the issue here. Because you mentioned Spectrum Shield, I suspect it is not.
>
>
>
> I appreciate the response and links. However, I've been told repeatedly by
> Spectrum that they're not blocking with Spectrum Shield. Despite these
> assurances, I've filled out a removal request through their published
> removal process several times, and the response I received stated that
> we're not being blocked. This check agrees with that:
>
> https://www.spectrum.net/support/forms/verify_url_security
>
>
>
> "Security Shield Is Not Blocking This Site
>
> The URL provided is not being blocked by Spectrum Security Shield
> The URL you entered should be accessible."
>
> Further, checking Spectrum DNS servers on the Spectrum network show that
> my company's main domain and all subdomains resolve to 127.0.0.54. So, if
> CujoAI/Spectrum Shield are not using DNS query responses to control access,
> then it's not CujoAI/Spectrum Shield that is responsible for the incorrect
> DNS response. Using a different recursive resolve, I can resolve our
> domains just fine. I can also resolve other domains that point to the same
> IPs as the sinkholed domain just fine. However, many people use the
> Spectrum default DNS servers and cannot access my website because of this.
>
>
>
> > You should contact Charter/Spectrum to have them investigate what their
> system might be blocking this content.
>
>
>
> I have tried, for months, including spending many hours on chat and phone
> support, to reach someone within Spectrum support who is capable of both
> understanding and directing me to someone who can fix the problem, but it
> hasn't happened yet. I've asked to talk to someone on the DNS team and was
> given a flat "No." I've posted here hoping that someone in the
> ISP-connected world knows SOMEONE at Spectrum, Akamai, or whichever company
> is actually responsible for the Spectrum DNS servers who can provide a
> remediation path.
>
>
>
> Regards,
>
>
>
> Kenneth
>
>
>
> On Tue, Apr 23, 2024 at 12:59 PM 'Livingood, Jason' via axon <
> axon at validin.com> wrote:
>
> > However, there's no correction process for Spectrum's DNS sinkhole
>
> > But back to the topic: someone mentioned to me that Spectrum may not be
> the direct providers for the DNS services they provide to their customers.
> If anyone knows anything about how I might discover and reach out to the
> people responsible, please let me know.
>
>
>
> I suspect what’s happened is an incorrect assumption that DNS is even the
> issue here. Because you mentioned Spectrum Shield, I suspect it is not.
>
> Spectrum Shield (
> https://www.spectrum.com/resources/internet-wifi/benefits-of-spectrum-security-shield)
> is a customer-managed security protection service built into their gateways
> (I assume you can turn it off). The malware and content detection engine
> behind that is very likely run by CujoAI (https://cujo.com/) and it does
> not use DNS query/response exchanges as the control mechanism (in part to
> counter-act DNS-changing malware or malware using its own DoH channel for
> example).
>
> You should contact Charter/Spectrum to have them investigate what their
> system might be blocking this content.
>
> Comcast (where I work) runs a similar system (
> https://www.xfinity.com/support/articles/using-xfinity-xfi-advanced-security)
> and maintains a site to report these sorts of issues (
> https://www.xfinity.com/support/articles/report-blocked-website).
>
> Jason
>
>
>
>
>
>
>
>
>
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