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Netgear has this habit of marketing its routers according to their technical specifications rather than their actual model numbers, and as a result customers will have to check their routers for stickers that designate the model number.Īll three models affected look like the router in the photo above, except that the D7800 has four antennae while the other two have three. The three Netgear models affected are the D7800, otherwise known as the AC2600 WiFi VDSL/ADSL Modem Router the R6400v2, aka the AC1750 Smart WiFi Router 802.11ac Dual Band Gigabit and the R6700v3, also known as the Nighthawk AC1750 Smart WiFi Dual Band Gigabit Router.
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9, 2021, and a NetUSB patch fixing the flaw was issued to vendors on Oct. Sentinel Labs notified KCodes of the flaw on Sept.
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"While these restrictions make it difficult to write an exploit for this vulnerability," he wrote, "we believe that it isn't impossible and so those with Wi-Fi routers may need to look for firmware updates for their router." How to update affected Netgear routers Van Amerongen admitted that for technical reasons, doing this properly was a bit tricky but still feasible for skilled attackers. He found it possible to create a memory-buffer overflow by sending NetUSB specific commands on that port number, gaining control over a router's Linux kernel.
Van Amerongen of Sentinel Labs noticed that NetUSB listens for not only local-network commands on port 20005, but internet commands as well, with no password or other authentication required. The problem exists in NetUSB, a Linux kernel module developed by Taiwanese company KCodes that lets devices - such as a printer or network-ready storage drive - get local-network access through the router's USB port.
In the meantime, we suggest that users of those other brands bother the manufacturers' tech-support teams with email messages asking for information about which models might be affected and if and when the router makers plan to fix the flaw.
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If you have one of the three Netgear models known to be vulnerable - the D7800, R6400v2 and R6700v3 - we have update instructions below.įor its part, D-Link has posted a brief note on its website stating that the company is "currently investigating this reported security issue" and "will provide further updates as soon as we have more information."Ī D-Link spokesperson told us that the company has not used the affected software in new models for several years following a similar vulnerability discovered in 2015.Īs for the other router brands, we've sent them requests for information and will update this story when we receive replies. While there are no known exploits of this flaw in the wild yet, Van Amerongen added that "there is a chance that one may become public in the future despite the rather significant complexity involved in developing one." Which router makers are doing what
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