Excessive-Severity RCE Flaw Disclosed in A number of Netgear Router Fashions


Networking gear firm Netgear has launched patches to remediate a high-severity distant code execution vulnerability affecting a number of routers that could possibly be exploited by distant attackers to take management of an affected system.

Traced as CVE-2021-40847 (CVSS rating: 8.1), the safety weak spot impacts the next fashions –

  • R6400v2 (mounted in firmware model
  • R6700 (mounted in firmware model
  • R6700v3 (mounted in firmware model
  • R6900 (mounted in firmware model
  • R6900P (mounted in firmware model 3.3.142_HOTFIX)
  • R7000 (mounted in firmware model
  • R7000P (mounted in firmware model
  • R7850 (mounted in firmware model
  • R7900 (mounted in firmware model
  • R8000 (mounted in firmware model
  • RS400 (mounted in firmware model

In accordance with GRIMM safety researcher Adam Nichols, the vulnerability resides inside Circle, a third-party part included within the firmware that provides parental management options, with the Circle replace daemon enabled to run by default even when the router hasn’t been configured to restrict each day web time for web sites and apps. This ends in a state of affairs that might allow unhealthy actors with community entry to achieve distant code execution (RCE) as root by way of a Man-in-the-Center (MitM) assault.

That is made doable owing to the style by which the replace daemon (referred to as “circled”) connects to Circle and Netgear to fetch updates to the filtering database — that are each unsigned and downloaded utilizing HTTP — thereby making it doable for an outsider to stage a MitM assault and reply to the replace request with a specially-crafted compressed database file, extracting which supplies the attacker the flexibility to overwrite executable binaries with malicious code.

Enterprise Password Management

“Since this code is run as root on the affected routers, exploiting it to acquire RCE is simply as damaging as a RCE vulnerability discovered within the core Netgear firmware,” Nichols said. “This specific vulnerability as soon as once more demonstrates the significance of assault floor discount.”

The disclosure comes weeks after Google safety engineer Gynvael Coldwind revealed particulars of three extreme safety vulnerabilities dubbed Demon’s Cries, Draconian Fear, and Seventh Inferno, impacting over a dozen of its good switches, permitting risk actors to bypass authentication and acquire full management of weak units.


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