Advisory Details

February 24th, 2021

D-Link DAP-2020 errorpage External Control of File Name Information Disclosure Vulnerability

ZDI-21-205
ZDI-CAN-11856

CVE ID CVE-2021-27250
CVSS SCORE 6.5, (AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N)
AFFECTED VENDORS D-Link
AFFECTED PRODUCTS DAP-2020
VULNERABILITY DETAILS

This vulnerability allows network-adjacent attackers to disclose sensitive information 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 errorpage request parameter, the process does not properly validate a user-supplied path prior to using it in file operations. An attacker can leverage this vulnerability to disclose stored credentials, leading to further compromise.

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
  • 2020-09-08 - Vulnerability reported to vendor
  • 2021-02-24 - Coordinated public release of advisory
CREDIT SUID
BACK TO ADVISORIES