D-Link DAP-2020 webproc var:page Stack-based Buffer Overflow Remote Code Execution Vulnerability
Vulnerability Details
This vulnerability allows network-adjacent attackers to execute arbitrary code on affected installations of D-Link DAP-2020 routers. Authentication is not required to exploit this vulnerability.
The specific flaw exists within the handling of the var:page 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.
Additional Details
D-Link has issued an update to correct this vulnerability. More details can be found at:
https://supportannouncement.us.dlink.com/announcement/publication.aspx?name=SAP10201
Disclosure Timeline
- 2021-03-12 - Vulnerability reported to vendor
- 2021-12-22 - Coordinated public release of advisory
- 2021-12-22 - Advisory Updated
Credit
chung96vn & Quang Nguyen (aka sovietw0rm) of Vietnam National Cyber Security Center (NCSC Vietnam)
