Microsoft Discloses Critical Bugs Allowing Takeover of NETGEAR Routers

Cybersecurity researchers have detailed crucial safety vulnerabilities impacting NETGEAR DGN2200v1 sequence routers, which they say could be reliably abused as a jumping-off level to compromise a network’s safety and attain unfettered entry.

The 3 HTTPd authentication safety weaknesses (CVSS scores: 7.1 – 9.4) effect routers managing firmware variations prior to v1…60, and have due to the fact been preset by the company in December 2020 as part of a coordinated vulnerability disclosure course of action.

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“The mounting selection of firmware assaults and ransomware attacks by way of VPN units and other world-wide-web-struggling with techniques are illustrations of attacks initiated outdoors and beneath the working process layer,” Microsoft 365 Defender Investigation Team’s Jonathan Bar Or mentioned. “As these kinds of attacks grow to be additional frequent, end users should glimpse to safe even the single-reason application that run their hardware—like routers.”


In a nutshell, the flaws let accessing router management pages utilizing an authentication bypass, enabling an attacker to achieve full regulate in excess of the router, as nicely as derive saved router credentials through a cryptographic aspect-channel attack, and even get well the username and the password saved in the router’s memory by exploiting the configuration backuprestore function.

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“The username and the password are in contrast [against the saved credentials] utilizing strcmp,” Bar Or discussed. “The libc implementation of strcmp operates by evaluating character-by-character until finally a NUL terminator is noticed or till a mismatch transpires. An attacker could acquire gain of the latter by measuring the time it can take to get a failure.”


Additionally, by abusing the aforementioned authentication bypass to fetch the configuration file, the researchers uncovered that the credentials were being encrypted applying a continual crucial, which can be subsequently employed to retrieve the plaintext password and the user identify.

NETGEAR DGN2200v1 people are recommended to download and update to the newest firmware to fend off any likely assaults.

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