NETGEAR RAX30 cmsCli_authenticate Stack-based Buffer Overflow Remote Code Execution Vulnerability

June 8th, 2023
ZDI-23-839 ZDI-CAN-19918

CVE ID

CVE-2023-34285

CVSS Score

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

Affected Vendors

NETGEAR

Affected Products

RAX30

Vulnerability Details

This vulnerability allows network-adjacent attackers to execute arbitrary code on affected installations of NETGEAR RAX30 routers. Authentication is not required to exploit this vulnerability.

The specific flaw exists within a shared library used by the telnetd service, which listens on TCP port 23 by default. The issue results from the lack of proper validation of the length of user-supplied data prior to copying it to a fixed-length stack-based buffer. An attacker can leverage this vulnerability to execute 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/000065696/RAX30-Firmware-Version-1-0-11-96-Hot-Fix

Disclosure Timeline

  • 2023-02-22 - Vulnerability reported to vendor
  • 2023-06-08 - Coordinated public release of advisory

Credit

Stefan Schiller (Sonar)

Back to Advisories