Advisory Details

August 4th, 2020

NETGEAR R6700 acsd Stack-based Buffer Overflow Remote Code Execution Vulnerability

ZDI-20-936
ZDI-CAN-9853

CVE ID CVE-2020-15635
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 R6700
VULNERABILITY DETAILS

This vulnerability allows network-adjacent attackers to execute arbitrary code on affected installations of NETGEAR R6700 routers. Authentication is not required to exploit this vulnerability.

The specific flaw exists within the acsd service, which listens on TCP port 5916 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 the admin user.

ADDITIONAL DETAILS NETGEAR has issued an update to correct this vulnerability. More details can be found at:
https://kb.netgear.com/000062127/Security-Advisory-for-Pre-Authentication-Buffer-Overflow-on-R6700v3-PSV-2020-0202
DISCLOSURE TIMELINE
  • 2020-04-22 - 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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