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NETGEAR Nighthawk WiFi6 Router Multiple Vulnerabilities

Critical

Synopsis

CVE-2022-47208 : Command Injection in User Agent
The “puhttpsniff” service, which runs by default, is susceptible to command injection due to improperly sanitized user input. An unauthenticated attacker on the same network segment as the router can execute arbitrary commands on the device without authentication.

CVSSv3 - 9.6 - AV:A/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

CVE-2022-47209 : Hardcoded Credentials / Backdoor Account
There are four user accounts on the device by default. The accounts and associated hashes stored in “/etc/passwd” are as follows:

admin:$1$redacted:0:0:Administrator:/:/bin/sh
support:$1$QkcawmV.$VU4maCah6eHihce5l4YCP0:0:0:Technical Support:/:/bin/sh
user:$1$9RZrTDt7$UAaEbCkq.Qa4u0QwXpzln/:0:0:Normal User:/:/bin/sh
nobody:$1$OWpQjger$j7CFLUn8yoD8agVf6x5gA0:0:0:nobody for ftp:/:/bin/sh

“admin” is the user normally intended to be interacted with. This user is used by the web interface and any other services a user typically interacts with.

The “support” user, however, appears to be an account created as a sort of backdoor for Technical Support staff. The default password for this account is “support” and cannot be changed by a user via any normally accessible means.

Please note that this account does not have access to the web ui or other standard interfaces. The patch for this issue appears to prevent access to this account from all currently known vectors.

CVSSv3 - 6.3 - AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L

CVE-2022-47210 : Command Injection in Restricted Shell
The default console presented to users over telnet (when enabled) is restricted to a subset of commands. Commands issued at this console, however, appear to be fed directly into a system call or other similar function. This allows any authenticated user to execute arbitrary commands on the device.

CVSSv3 - 8.8 - AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Solution

Apply the most recent vendor supplied patch. At the time of this writing, the most recent patch can be found here: https://kb.netgear.com/000065411/RAX30-Firmware-Version-1-0-9-90-Hot-Fix

Please note that at the time of this writing, the auto-update and "Check for Updates" mechanisms of the device do not appear to detect that this patch is available. It must be applied manually.

Disclosure Timeline

December 1, 2022 - Tenable discovers patch related to a flaws pending disclosure.
December 6, 2022 - Tenable sees Synacktiv blog detailing the same flaws.
December 12, 2022 - Tenable notifies vendor of missing CVE assignment and intent to assign identifiers.
December 16, 2022 - Tenable assigns identifiers.

All information within TRA advisories is provided “as is”, without warranty of any kind, including the implied warranties of merchantability and fitness for a particular purpose, and with no guarantee of completeness, accuracy, or timeliness. Individuals and organizations are responsible for assessing the impact of any actual or potential security vulnerability.

Tenable takes product security very seriously. If you believe you have found a vulnerability in one of our products, we ask that you please work with us to quickly resolve it in order to protect customers. Tenable believes in responding quickly to such reports, maintaining communication with researchers, and providing a solution in short order.

For more details on submitting vulnerability information, please see our Vulnerability Reporting Guidelines page.

If you have questions or corrections about this advisory, please email [email protected]

Risk Information

Tenable Advisory ID: TRA-2022-37
Affected Products:
NETGEAR Nighthawk WiFi6 Router prior to V1.0.9.90
Risk Factor:
Critical

Advisory Timeline

December 16, 2022 - Initial release.

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