D-Link DAP-2622 Telnet CLI Use of Hardcoded Credentials Authentication Bypass Vulnerability

August 25th, 2023
ZDI-23-1230 ZDI-CAN-20050

CVE ID

CVE-2023-35724

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-2622

Vulnerability Details

This vulnerability allows network-adjacent attackers to bypass authentication on affected installations of D-Link DAP-2622 routers. Authentication is not required to exploit this vulnerability.

The specific flaw exists within the CLI service, which listens on TCP port 23. The server program contains hard-coded credentials. An attacker can leverage this vulnerability to bypass authentication on the system.

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=SAP10349

Disclosure Timeline

  • 2023-01-20 - Vulnerability reported to vendor
  • 2023-08-25 - Coordinated public release of advisory

Credit

Dmitry "InfoSecDJ" Janushkevich of Trend Micro Zero Day Initiative

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