(Pwn2Own) NETGEAR R6700v3 Missing Authentication for Critical Function Arbitrary File Upload Vulnerability

March 23rd, 2022
ZDI-22-521 ZDI-CAN-15782

CVE ID

CVSS Score

3.1 AV:A/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N

Affected Vendors

NETGEAR

Affected Products

R6700v3

Vulnerability Details

This vulnerability allows network-adjacent attackers to upload arbitrary files on affected installations of NETGEAR R6700v3 routers. Authentication is not required to exploit this vulnerability.

The specific flaw exists within the Circle Parental Control feature, which listens on TCP ports 4444 and 4567 by default. The issue results from the lack of authentication prior to allowing access to functionality. An attacker can leverage this in conjunction with other vulnerabilities to execute arbitrary code in the context of root.

Additional Details

NETGEAR has issued an update to correct this vulnerability. More details can be found at:
https://kb.netgear.com/000064724/Security-Advisory-for-Security-Misconfiguration-on-Some-Routers-and-Orbi-WiFi-Systems-PSV-2021-0330

Disclosure Timeline

  • 2022-01-07 - Vulnerability reported to vendor
  • 2022-03-23 - Coordinated public release of advisory

Credit

Flashback Team: Pedro Ribeiro (@pedrib1337) && Radek Domanski (@RabbitPro)

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