Advisory Details

June 18th, 2024

(0Day) Actiontec WCB6200Q Multipart Boundary Stack-based Buffer Overflow Remote Code Execution Vulnerability

ZDI-24-807
ZDI-CAN-21416

CVE ID CVE-2024-6144
CVSS SCORE 8.8, AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
AFFECTED VENDORS Actiontec
AFFECTED PRODUCTS WCB6200Q
VULNERABILITY DETAILS

This vulnerability allows network-adjacent attackers to execute arbitrary code on affected installations of Actiontec WCB6200Q routers. Authentication is not required to exploit this vulnerability.

The specific flaw exists within the HTTP server. 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 HTTP server.

ADDITIONAL DETAILS

08/03/23 – ZDI requested vendor PSIRT contact.

08/11/23 – ZDI asked for an update.

09/18/23 – ZDI asked for an update.

09/18/23 – The vendor sent an automated support ticket response.

10/20/23 – ZDI asked for an update.

02/27/24 – ZDI sent the report to Actiontec support.

03/27/24 – The vendor sent an automated support ticket response.

06/17/27 – The ZDI informed the vendor that since we’ve never received a formal response to the report, that we intend to publish the report as a zero-day advisory on 6/18/24.

-- Mitigation: Given the nature of the vulnerability, the only salient mitigation strategy is to restrict interaction with the application.


DISCLOSURE TIMELINE
  • 2024-02-27 - Vulnerability reported to vendor
  • 2024-06-18 - Coordinated public release of advisory
  • 2024-07-01 - Advisory Updated
CREDIT Logan Stratton
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