// For flags

CVE-2021-27249

D-Link DAP-2020 WEB_CmdFileList Command Injection Remote Code Execution Vulnerability

Severity Score

8.8
*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

0
*Multiple Sources

Exploited in Wild

-
*KEV

Decision

-
*SSVC
Descriptions

This vulnerability allows network-adjacent attackers to execute arbitrary code on affected installations of D-Link DAP-2020 v1.01rc001 Wi-Fi access points. Authentication is not required to exploit this vulnerability. The specific flaw exists within the processing of CGI scripts. The issue results from the lack of proper validation of a user-supplied string before using it to execute a system call. An attacker can leverage this vulnerability to execute code in the context of root. Was ZDI-CAN-11369.

Esta vulnerabilidad permite a atacantes adyacentes a la red ejecutar código arbitrario en las instalaciones afectadas de los puntos de acceso Wi-Fi D-Link DAP-2020 versión v1.01rc001. No es requerida una autenticación para explotar esta vulnerabilidad. El fallo específico se presenta dentro del procesamiento de scripts CGI. El problema resulta de una falta de comprobación apropiada de una cadena suministrada por el usuario antes de usarla para ejecutar una llamada al sistema. Un atacante puede aprovechar esta vulnerabilidad para ejecutar código en el contexto de root. Era ZDI-CAN-11369

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. The issue results from the lack of proper validation of a user-supplied string before using it to execute a system call. An attacker can leverage this vulnerability to execute code in the context of root.

*Credits: Anthony Schneiter & Jannis Kirschner from Team SUID (in alphabetical order)
CVSS Scores
Attack Vector
Adjacent
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High
Attack Vector
Adjacent
Attack Complexity
Low
Authentication
None
Confidentiality
Complete
Integrity
Complete
Availability
Complete
* Common Vulnerability Scoring System
SSVC
  • Decision:-
Exploitation
-
Automatable
-
Tech. Impact
-
* Organization's Worst-case Scenario
Timeline
  • 2021-02-16 CVE Reserved
  • 2021-02-24 CVE Published
  • 2024-05-01 EPSS Updated
  • 2024-08-03 CVE Updated
  • ---------- Exploited in Wild
  • ---------- KEV Due Date
  • ---------- First Exploit
CWE
  • CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
CAPEC
Affected Vendors, Products, and Versions
Vendor Product Version Other Status
Vendor Product Version Other Status <-- --> Vendor Product Version Other Status
Dlink
Search vendor "Dlink"
 Dap-2020 Firmware
Search vendor "Dlink" for product "Dap-2020 Firmware"
 1.01
Search vendor "Dlink" for product "Dap-2020 Firmware" and version "1.01"
rc001
Affected
in Dlink
Search vendor "Dlink"
 Dap-2020
Search vendor "Dlink" for product "Dap-2020"
--
Safe