(Pwn2Own) NETGEAR R7800 funjsq_httpd Missing Authentication for Critical Function Remote Code Execution Vulnerability

February 26th, 2021
ZDI-21-263 ZDI-CAN-12360

CVE ID

CVE-2021-27255

CVSS Score

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

Affected Vendors

NETGEAR

Affected Products

R7800

Vulnerability Details

This vulnerability allows remote attackers to execute arbitrary code on affected installations of NETGEAR R7800. Authentication is not required to exploit this vulnerability.

The specific flaw exists within the refresh_status.aspx endpoint. The issue results from a lack of authentication required to start a service on the server. 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/000062883/Security-Advisory-for-Multiple-Vulnerabilities-on-Some-Routers-Satellites-and-Extenders

Disclosure Timeline

  • 2020-12-31 - Vulnerability reported to vendor
  • 2021-02-26 - Coordinated public release of advisory

Credit

STARLabs

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