Advisory Details

This vulnerability allows network-adjacent attackers to execute arbitrary code on affected installations of D-Link DAP-1330 routers. Authentication is not required to exploit this vulnerability.

The specific flaw exists within the handling of the HNAP_AUTH HTTP header. The issue results from the lack of proper validation of the length of user-supplied data prior to copying it to a fixed-length buffer. An attacker can leverage this vulnerability to execute code in the context of the device.

This vulnerability is being disclosed publicly without a patch in accordance with the ZDI 120 day deadline.

01/29/21 – ZDI reported the vulnerabilities to the vendor
01/29/21 – The vendor acknowledged the report
05/20/21 – ZDI requested an update
05/23/21 – The vendor indicated they would provide an update in during the week
06/01/21 – ZDI requested an update and notified the vendor of the intention to publish the report as a 0-day advisory on 06/09/21

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

• 2021-01-29 - Vulnerability reported to vendor
• 2021-06-10 - Coordinated public release of advisory
• 2021-09-27 - Advisory Updated