Colin Mc Hugo

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Colin Mc Hugo
Security Engineer Manager & CEO at Quantum Infinite Solutions Group Ltd.
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Cyber Security Incident Response
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Bugs in Managed DNS Services Cloud Let Attackers Spy On DNS Traffic

August 11, 2021
Managed DNS Services

Cybersecurity researchers have disclosed a brand new class of vulnerabilities impacting main DNS-as-a-Service (DNSaaS) suppliers that might permit attackers to exfiltrate delicate info from company networks.

“We discovered a easy loophole that allowed us to intercept a portion of worldwide dynamic DNS visitors going by means of managed DNS suppliers like Amazon and Google,” researchers Shir Tamari and Ami Luttwak from infrastructure safety agency Wiz said.

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Calling it a “bottomless effectively of beneficial intel,” the treasure trove of data incorporates inside and exterior IP addresses, pc names, worker names and areas, and particulars about organizations’ net domains. The findings had been presented on the Black Hat USA 2021 safety convention final week.

“The visitors that leaked to us from inside community visitors offers malicious actors all of the intel they might ever must launch a profitable assault,” the researchers added. “Greater than that, it offers anybody a hen’s eye view on what’s occurring inside firms and governments. We liken this to having nation-state degree spying functionality – and getting it was as simple as registering a site.”

The exploitation course of hinges on registering a site on Amazon’s Route53 DNS service (or Google Cloud DNS) with the identical title because the DNS title server — which offers the interpretation (aka decision) of domains and hostnames into their corresponding Web Protocol (IP) addresses — leading to a state of affairs that successfully breaks the isolation between tenants, thus permitting beneficial info to be accessed.

In different phrases, by creating a brand new area on the Route53 platform inside AWS title server with the identical moniker and pointing the hosted zone to their inside community, it causes the Dynamic DNS visitors from Route53 prospects’ endpoints to be hijacked and despatched on to the rogue and same-named server, thus creating a straightforward pathway into mapping company networks.

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“The dynamic DNS visitors we wiretapped got here from over 15,000 organizations, together with Fortune 500 firms, 45 U.S. authorities companies, and 85 worldwide authorities companies,” the researchers mentioned. “The information included a wealth of beneficial intel like inside and exterior IP addresses, pc names, worker names, and workplace areas.”

Whereas Amazon and Google have since patched the problems, the Wiz analysis group has additionally released a tool to let firms take a look at if their inside DDNS updates are being leaked to DNS suppliers or malicious actors.

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