CVE-2021-34862: D-Link DAP-2020 webproc var:menu Stack-based Buffer Overflow Remote Code Execution Vulnerability

First published: Mon Oct 25 2021(Updated: )

This vulnerability allows network-adjacent attackers to execute arbitrary code on affected installations of D-Link DAP-2020 1.01rc001 routers. Authentication is not required to exploit this vulnerability. The specific flaw exists within the handling of the var:menu parameter provided to the webproc endpoint. 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 root. Was ZDI-CAN-13270.

Credit: zdi-disclosures@trendmicro.com

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