Colin Mc Hugo

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Colin Mc Hugo
Security Engineer Manager & CEO at Quantum Infinite Solutions Group Ltd.

DNSpooq bugs expose millions of devices to DNS cache poisoning

January 29, 2021

Safety flaws in a extensively used DNS software program bundle might enable attackers to ship customers to malicious web sites or to remotely hijack their units

Hundreds of thousands of units may very well be susceptible to Domain Name System (DNS) cache poisoning and distant code execution assaults as a result of seven safety flaws in dnsmasq, DNS forwarding and caching software program generally present in smartphones, desktops, servers, routers and different Web of Issues units, in keeping with Israel-based safety firm JSOF, which discovered the security holes.

Collectively dubbed DNSpooq, the vulnerabilities within the open-source utility have an effect on quite a lot of units and firmware, together with these made by a number of the world’s main tech firms.

“Among the DNSpooq vulnerabilities enable for DNS cache poisoning and one of many DNSpooq vulnerabilities might allow a possible Distant Code execution that might enable a takeover of many manufacturers of house routers and different networking tools, with hundreds of thousands of units affected, and over 1,000,000 cases immediately uncovered to the Web,” warned JSOF. In accordance with Shodan, there are virtually 1.2 million dnsmasq servers uncovered to the web, with but extra susceptible units confined to inside networks but additionally in danger.

RELATED READING: DNS attacks: How they try to direct you to fake pages

Researchers recognized no fewer than 40 distributors that use dnsmasq in a variety of merchandise and in numerous items of firmware and software program. The checklist consists of massive names comparable to Cisco, Asus, AT&T, Comcast, Siemens, Dell, Linksys, Qualcomm, Motorola, and IBM, to say however just a few. Whether or not and to what extent units are affected is dependent upon how they use dnsmasq

DNSpooq consists of seven vulnerabilities divided into two teams – three that might enable DNS cache poisoning assaults and 4 buffer overflow vulnerabilities, certainly one of which might result in distant code execution and system takeover.

An summary of the DNSpooq vulnerabilities (supply: JSOF)

“The impression of DNS cache poisoning of the routing tools DNS forwarding server can probably result in totally different sorts of fraud if customers consider they’re looking to 1 web site however are literally routed to a different,” the researchers mentioned. They went on so as to add that every system inclined to DNS cache poisoning may additionally be taken over by an attacker.

Whereas on their very own the safety bugs current a restricted danger, as soon as chained and mixed they may be used to conduct Distributed Denial-of-Service (DDoS) assaults in addition to wormable assaults that might unfold malware between units and networks.

Researchers disclosed the vulnerabilities in August 2020 and went public with their discovery after the embargo ended this month. Whereas highlighting plenty of workarounds in its technical whitepaper to DNSpooq, JSOF suggested everyone to use one of the best “antidote” – replace to dnsmasq version 2.83. Within the meantime, a number of distributors have launched their respective advisories, mitigations, workarounds and patches, which at the moment are neatly listed on the web site of the CERT Coordination Center at Carnegie Mellon College. The Cybersecurity and Infrastructure Safety Company (CISA) additionally had some advice to share for organizations that use susceptible merchandise.

In June 2020, JSOF found and disclosed 19 safety vulnerabilities that had been collectively dubbed Ripple20 and had been discovered to have an effect on a preferred TCP/IP software program library utilized by hundreds of thousands of linked units.

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