Advisory Details

August 4th, 2020

NETGEAR Multiple Routers check_ra Stack-based Buffer Overflow Remote Code Execution Vulnerability

ZDI-20-937
ZDI-CAN-9852

CVE ID CVE-2020-15636
CVSS SCORE 8.1, (AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H)
AFFECTED VENDORS NETGEAR
AFFECTED PRODUCTS Multiple Routers
VULNERABILITY DETAILS

This vulnerability allows remote attackers to execute arbitrary code on affected installations of NETGEAR R6400, R6700, R7000, R7850, R7900, R8000, RS400, and XR300 routers. Authentication is not required to exploit this vulnerability.

The specific flaw exists within the check_ra service. A crafted raePolicyVersion in a RAE_Policy.json file can trigger an overflow of 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/000062128/Security-Advisory-for-Pre-Authentication-Stack-Overflow-on-R6700v3-PSV-2020-0224
DISCLOSURE TIMELINE
  • 2020-05-13 - Vulnerability reported to vendor
  • 2020-08-04 - Coordinated public release of advisory
CREDIT Pedro Ribeiro (@pedrib1337 | pedrib@gmail.com) and Radek Domanski (@RabbitPro | radek.domanski@gmail.com)
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