Advisory Details

February 24th, 2021

D-Link DAP-2020 webproc getpage Stack-based Buffer Overflow Remote Code Execution Vulnerability

ZDI-21-203
ZDI-CAN-10932

CVE ID CVE-2021-27248
CVSS SCORE 8.8, (AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H)
AFFECTED VENDORS D-Link
AFFECTED PRODUCTS DAP-2020
VULNERABILITY DETAILS

This vulnerability allows network-adjacent attackers to execute arbitrary code on affected installations of D-Link DAP-2020 Wi-Fi access points. Authentication is not required to exploit this vulnerability.

The specific flaw exists within the processing of CGI scripts. When parsing the getpage parameter, the process does not properly validate 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
  • 2020-08-21 - Vulnerability reported to vendor
  • 2021-02-24 - Coordinated public release of advisory
CREDIT chung96vn ft phieulang & Chi Tran
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